Bulk LPG road tankers Assembling Requirements DRAFT ...— Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys IEC 60079-0, Electrical apparatus for explosive

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DRAFT UGANDA STANDARD

DUS DEAS 902

First Edition 2020-mm-dd

Reference number DUS DEAS 902: 2016

© UNBS 2020

Bulk LPG road tankers — Assembling — Requirements

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ii © UNBS 2020 - All rights reserved

Compliance with this standard does not, of itself confer immunity from legal obligations

A Uganda Standard does not purport to include all necessary provisions of a contract. Users are responsible for its correct application

© UNBS 2020

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilised in any form or by any means, electronic or mechanical, including photocopying and microfilm, without prior written permission from UNBS.

Requests for permission to reproduce this document should be addressed to

The Executive Director Uganda National Bureau of Standards P.O. Box 6329 Kampala Uganda Tel: +256 417 333 250/1/2 Fax: +256 414 286 123 E-mail: [email protected] Web: www.unbs.go.ug

mailto:[email protected]

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© UNBS 2020 - All rights reserved iii

National foreword

Uganda National Bureau of Standards (UNBS) is a parastatal under the Ministry of Trade, Industry and Cooperatives established under Cap 327, of the Laws of Uganda, as amended. UNBS is mandated to co-ordinate the elaboration of standards and is

(a) a member of International Organisation for Standardisation (ISO) and

(b) a contact point for the WHO/FAO Codex Alimentarius Commission on Food Standards, and

(c) the National Enquiry Point on TBT Agreement of the World Trade Organisation (WTO).

The work of preparing Uganda Standards is carried out through Technical Committees. A Technical Committee is established to deliberate on standards in a given field or area and consists of representatives of consumers, traders, academicians, manufacturers, government and other stakeholders.

Draft Uganda Standards adopted by the Technical Committee are widely circulated to stakeholders and the general public for comments. The committee reviews the comments before recommending the draft standards for approval and declaration as Uganda Standards by the National Standards Council.

This Draft Uganda Standard, DUS DEAS 902: 2020, Bulk LPG road tankers — Assembling — Requirements, is identical with and has been reproduced from an East African Standard, DEAS 902: 2020, Bulk LPG road tankers — Assembling — Requirements, and is being proposed for adoption as a Uganda Standard.

The committee responsible for this document is Technical Committee UNBS/TC 16, Petroleum.

Wherever the words, “East African Standard " appear, they should be replaced by "Uganda Standard."

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ICS

© EAC 2016 First Edition 2016

DRAFT EAST AFRICAN STANDARD

Bulk LPG road tankers — Assembling — Requirements

EAST AFRICAN COMMUNITY

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ii © EAC 2016 – All rights reserved

Copyright notice

This EAC document is copyright-protected by EAC. While the reproduction of this document by participants in the EAC standards development process is permitted without prior permission from EAC, neither this document nor any extract from it may be reproduced, stored or transmitted in any form for any other purpose without prior written permission from EAC.

Requests for permission to reproduce this document for the purpose of selling it should be addressed as shown below or to EAC’s member body in the country of the requester:

© East African Community 2016 — All rights reserved East African Community P.O. Box 1096 Arusha Tanzania Tel: 255 27 2504253/8 Fax: 255 27 2504481/2504255 E-mail: [email protected]

Web: www.eac-quality.net

Reproduction for sales purposes may be subject to royalty payments or a licensing agreement. Violators may be prosecuted.

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© EAC 2016 – All rights reserved iii

Foreword

Development of the East African Standards has been necessitated by the need for harmonizing requirements governing quality of products and services in the East African Community. It is envisaged that through harmonized standardization, trade barriers that are encountered when goods and services are exchanged within the Community will be removed.

In order to achieve this objective, the Community established an East African Standards Committee mandated to develop and issue East African Standards.

The Committee is composed of representatives of the National Standards Bodies in Partner States, together with the representatives from the private sectors and consumer organizations. Draft East African Standards are circulated to stakeholders through the National Standards Bodies in the Partner States. The comments received are discussed and incorporated before finalization of standards, in accordance with the procedures of the Community.

East African Standards are subject to review, to keep pace with technological advances. Users of the East African Standards are therefore expected to ensure that they always have the latest versions of the standards they are implementing. DEAS 902 was prepared by Technical Committee EASC/TC 038

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DRAFT EAST AFRICAN STANDARD DEAS 902 :2016

© EAC 2016 – All rights reserved 1

Bulk LPG road tankers —— Assembling requirements

1 Scope

This draft east African standard gives requirements for vehicle, equipment ,accessories and assembling thereof used to form a bulk LPG road tanker to ensure that transportation, filling, and discharge operations can be carried safely 2 Normative references The following referenced documents are indispensable for the application of this document: ISO 9606-1, Qualification of welders – fusion welding

ISO 16010, Elastomeric seals -- Material requirements for seals used in pipes and fittings carrying

gaseous fuels and hydrocarbon fluids

ISO 6447, Rubber seals -- Joint rings used for gas supply pipes and fittings -- Specification for

material

ISO 5752, Metal valves for use in flanged pipe systems -- Face-to-face and centre-to-face dimensions

ISO 7165, Fire fighting -- Portable fire extinguishers -- Performance and construction

ISO 14732, Welding personnel -- Qualification testing of welding operators and weld setters for

mechanized and automatic welding of metallic materials

ISO 7121, Steel ball valves for general-purpose industrial applications

CD/K/5, Welded steel tanks for liquefied petroleum gas (LPG) — Road tankers — Design and

manufacture

ISO 7005, Pipe flanges -- Part 1: Steel flanges for industrial and general service piping systems

ISO 7483, Dimensions of gaskets for use with flanges to ISO 7005

ISO 3834-2, Quality requirements for fusion welding of metallic materials — Part 2: Comprehensive

quality requirements

ISO 3834-3, Quality requirements for welding- Fusion welding of metallic materials — Part 3: Standard

quality requirements

ISO 15609-1, Specification and qualification of welding procedures for metallic materials — Welding

procedure specification — Part 1 Arc welding

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2 © EAC 2016 – All rights reserved

ISO 15614-1, Specification and qualification welding procedures for metallic materials — Welding

procedure test — Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys

IEC 60079-0, Electrical apparatus for explosive gas atmospheres - Part 0: General requirements.

Electrical Tools and Appliances

IEC 60079-1, Electrical apparatus for explosive gas atmospheres – Part 1, Flameproof enclosures 'd'

Electrical Tools and Appliances.

IEC 60079-2, Electrical apparatus for explosive gas atmospheres - Part 2: Pressurized enclosures 'p'.

IEC 60079- 5, Electrical apparatus for explosive gas atmospheres - Part 5: Powder filling 'q'

IEC 60079- 6, Electrical apparatus for explosive gas atmospheres - Part 6: Oil immersion 'O'.

IEC 60079-7, Electrical apparatus for explosive gas atmospheres - Part 7: Increased safety 'e'.

IEC 60079-11, Electrical apparatus for explosive gas atmospheres - Part 11: Intrinsic safety 'i'.

IEC 60079-15, Electrical apparatus for explosive gas atmospheres - Part 15: Type of protection 'n'.

IEC 60079-14, Electrical apparatus for explosive gas atmospheres - Part 14: Electrical installations in

hazardous areas (other than mines)

IEC 60079-18, Electrical apparatus for explosive gas atmospheres - Part 18: Encapsulation 'm'.

IEC 60529, Specification for degrees of protection provided by enclosures (IP code)

ISO 1726, Road vehicles — Mechanical coupling between tractors and semi-trailers-

Interchangeability

ISO 3795, Method for determination of burning behaviour of interior materials for road vehicles and

tractors and machinery for agriculture use

ISO 2928, Rubber hoses and hose assemblies for LPG in the liquid or gaseous phase and natural gas upto 25 bar (2.5 Mpa) — Specification

3 Terms and definitions For the purposes of this standard, the following terms and definitions shall apply: 3.1 LPG (Liquefied petroleum gas) is pure propane, butane or a mixture of the propane and butane 3.2 primary shut-off system valve or a series of valves attached to the tank which provides a method of closing the tank 3.3 equipment 3.3.1 vehicle LPG equipment

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equipment and pipework on the road tanker which is in contact with LPG and forms part of the LPG operating system, shut-down system or safety system, but which is not directly connected to the tank and is not part of the LPG fuel system 3.3.2 tank pressure vessel containing the LPG, connecting nozzles and welded attachments 3.3.3 accessories fittings connected to the tank 3.4 thermowell permanently sealed pocket in the tank/pipework for the temperature gauge 3.5 pipework fabricated tubes, pipes and fittings which interconnect the tank, valves and equipment 3.6 road tanker rigid vehicle, semi-trailer or trailer comprising of one or more fixed tanks 4 Requirements

4.1 General

Equipment, when assembled, shall be of such a nature that they withstand the anticipated mechanical, chemical and thermal stresses and remain tight. In particular they shall be: a) manufactured of materials which give the finished equipment the required mechanical

properties; in particular, where equipment is subject to the low temperatures (including low temperatures caused by filling), suitably ductile material shall be used; and

b) protected against accidental damage where such damage could lead to a dangerous escape of LPG.

4.2 Equipment

Equipment for LPG road-tankers shall be fitted in accordance with table 1.

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Table 1 — Road-tanker equipment

Description Clauses Mandatory Optional

Tank accessories Contents gauge 6.1.1 / 8.2 X

Pressure gauge 6.1.2 / 8.3 X

Primary shut-off system 6.1.3 X

Temperature gauge 8.4 X

Pressure relief valve (PRV)

8.11 X

Sun shield

6.2 X

Road tanker LPG equipment

Pipework

7.1.2 / 8.1.6 X

Emergency shut-down system

10.2 X

Hoses

7.1.3 / 8.6 X

Thermal expansion valves/hydrostatic relief valves

7.1.4 X

Valves

7.1.5 /8.10 X

Compressor

7.2 X

Pump

7.2/ 8.5 X

Hose reel 7.2/ 8.7 X Metering system 7.2/ 8.9 X

Earth reel 7.2/ 8.8 X

“x” - shall be done - Not necessary

4.3 Valve access Valves required for normal and emergency operation shall be readily accessible or remotely operated. 5 Tank 5.1 Design and manufacture The tank shall be designed and manufactured in accordance with CD/K/5.

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5.2 Mounting of tank on road tanker

5.2.1 General

The tank and fastenings to the structure of the road tanker shall be designed and constructed to absorb safely the stresses from normal use such as surge, vibration and braking action. 5.2.2 Mounting 5.2.2.1 The fixing of the tank to the road tanker shall be designed in accordance with a calculation based on the forces given in Table 2.

Table 2 — Forces for fixing the tank to the road tanker

Direction of force Force N

In the driving direction

2 g x total mass of tank

Horizontal, at 90° to the driving direction


Vertical, upwards


Vertical, downwards


The total mass of the tank shall be taken as the tare mass plus the maximum allowable mass of the contents. g = gravitational acceleration.

5.2.2.2 A sample method of calculation for the mountings of the tank to the chassis is contained in Annex A. 5.2.2.3 The tank shall be electrically continuous with the chassis. The resistance of this electrical path shall not exceed 10 Ω. 5.2.2.4 If the tank, while on the chassis, will be subjected to a hydraulic test, during which the tank can contain twice the normal weight of its normal operating capacity it shall be established that the chassis is capable of taking this weight.

Note It is not advisable to carry out hydraulic test while the tank is mounted on the vehicle chassis

6 Tank accessories 6.1 Required tank accessories 6.1.1 Contents gauge 6.1.1.1 Tanks shall be equipped with a suitable contents gauge. 6.1.1.2 If the contents of the tank are to be measured by volume rather than by weight, then at least two independent systems of measuring the contents shall be fitted, only one of which can be a fixed liquid level gauge.

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6.1.2 Pressure gauge Tanks shall be equipped with a pressure gauge in accordance with 8.3. 6.1.3 Primary shut-off system 6.1.3.1 All connections to the tank in excess of 1.5 mm diameter, other than those for pressure relief valves or those permanently fitted with blank flanges or plugs, shall incorporate a primary shut-off system. 6.1.3.2 The primary shut-off system shall be of a design intended to limit the release of the tank's content in the event of external damage. 6.1.3.3 The primary shut-off system required depends upon the purpose of the tank connection as follows: a) Discharge/Filling to liquid phase: A normally closed internal shut-off valve opened by hydraulic, pneumatic or mechanical power from the road tanker. The valve shall be designed for rapid closure on command (see 10.2). The system shall incorporate a thermally sensitive device or other means that will ensure positive closure in the event of a fire and shall incorporate an excess flow valve facility. b) Filling to vapour phase: The road tanker filling connection shall be provided with: i) a non-return valve or a series of non-return valves in combination with a manual shut-off valve, or a normally closed internal shut-off valve opened by hydraulic, pneumatic or mechanical power from the road tanker along with an anti-drive-away system/emergency-shut down system.

c) Other liquid or vapour piped connections: An internal excess flow valve or internal - non-return valve in series combination with a manual shut-off valve shall be provided. 6.1.3.4 In the liquid discharge line at least one hand operated or remotely operated valve shall be positioned as close as reasonable to the tank outlet after the internal shut-off valve. 6.1.3.5 The remotely operated shut-off valves shall be in the closed position during transport.

6.2 Sun shields sun shield may be used to reduce solar radiation effects 6.3 Temperature gauge The tank shall be fixed with temperature gauge in accordance with 8.4. 7 Road tanker LPG equipment

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7.1 Required LPG equipment 7.1.1 General LPG equipment and pipe work shall be protected against mechanical damage, by its design or location and/or by barriers.

7.1.2 Pipe-work Mechanical barriers shall not be attached to pipe work or valves, which they are intended to protect. The pipe work shall be installed so as to prevent damage due to vibration. The number of joints shall be kept to a minimum. Joints shall be welded or weld flanged except if permitted by 9.4. 7.1.3 Connecting hoses Connecting hoses for pipe work/equipment shall be in accordance with 8.6. 7.1.4 Thermal expansion valves/hydrostatic relief valves Thermal expansion valves/hydrostatic relief valves shall be provided for all pipe sections where liquid may be trapped between closed valves unless the system is otherwise protected. They shall be positioned so that they do not point at the LPG tank nor shall they be placed in the bottom quarter of horizontal pipes. Hydrostatic relief valves shall be set to discharge at a pressure not above the design pressure of the equipment being protected. 7.1.5 Valves Valves shall be in accordance with 8.10. A shut-off valve is required in the pipework for liquid transfer or vapour balance connections used for routine operations. It shall be positioned as close as reasonable to the end of the pipework and/or hose outlet.

7.2 Optional LPG equipment If any of the following equipment is fitted to the road tanker, the following requirements shall apply: a) pumps shall be in accordance with 8.5;

b) delivery hoses shall be in accordance with 8.6;

c) hose reels shall be in accordance with 8.7;

d) earthing reels shall be in accordance with 8.8; and

e) metering systems shall be in accordance with 8.9.

8 Equipment specifications 8.1 Suitable materials

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8.1.1 General

Unless otherwise specified by the design documents, the design temperature range shall be – 20 °C to + 50 °C. The materials of construction shall be suitable for operating within the envisaged temperature range. If the road tanker could be subjected to more severe ambient or product temperatures, the design temperature range shall be – 40 °C to + 50 °C. Guidance on selection of material grades is given in CD/K/5

8.1.2 Steel pressure retaining parts

Steel pressure-retaining materials shall be of appropriate steels.

8.1.3 Non-pressure retaining parts

Non-pressure retaining parts that are directly welded to pressure retaining parts shall be of suitable materials or materials, which are demonstrably equivalent, and shall be compatible with the material of pressure retaining parts. 8.1.4 Welding consumables

Welding consumables shall be able to provide consistent welds with properties at least equal to those specified for the parent materials in the finished part.

8.1.5 Non-metallic materials

8.1.5.1 Non-metallic materials shall be compatible with both phases of LPG over the range of pressures and temperatures for which the vehicle LPG equipment is designed. 8.1.5.2 Non-metallic materials shall also comply with the appropriate requirements of ISO 6447. 8.1.5.3 All elastomeric materials in contact with LPG shall meet the specific requirements of ISO 16010 for resistance to the following: a) gas (pentane test);

b) lubricants;

c) ageing;

d) low temperature;

e) high temperature;

f) compression; and

g) ozone (where gasket/seal is exposed to atmosphere).

8.1.7 Certification of materials Pressure retaining parts and non-pressure retaining parts directly welded to pressure containing parts shall be provided with material manufacturers’ certificates. 8.1.8 Control of materials 8.1.8.1 The manufacturer shall maintain a system of identification for the material used in the fabrication so that all material for pressure-retaining parts and non-pressure-retaining parts directly welded to pressure-retaining parts in the completed work can be traced to their origin. The system

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shall incorporate appropriate procedures for verifying the identity of material received from the supplier. 8.1.8.2 Verifying procedures shall be based on the material manufacturers’ certificates and/or acceptance tests. 8.1.8.3 Details of welding consumables shall be retained.

8.2 Contents gauge 8.2.1 Tanks shall be equipped with a suitable contents gauge. 8.2.2 The bleed hole maximum opening shall not be larger than 1.5 mm diameter unless it is protected by a shut-off valve and a suitable excess flow valve. 8.2.3 The operational bleed screw shall remain captive at all times. 8.2.4 It shall be possible to replace the gland without withdrawing the tank from service. 8.2.5 The design of the rotary gauging device shall take account of transport vibrations. 8.2.6 Roto gauges, where used, shall be free to move in both clockwise and anti-clockwise directions.

8.3 Pressure gauge 8.3.1 The pressure gauge shall be located so that it is protected from damage and can be easily monitored. 8.3.2 If a gauge is connected directly to the tank, the requirements of 6.1.3.1 shall apply. 8.3.3 Tanks shall be equipped with a suitable Pressure gauge.

8.4 Temperature gauge 8.4.1 The connection for a temperature gauge to pipework or tank shall be made by a thermowell. 8.4.2 The thermowell shall be constructed in accordance with the same design requirements as the tank or pipework into which it is permanently fixed. 8.4.3 Tanks shall be equipped with a suitable temperature gauge.

8.5 Pump 8.5.1 The rotational speed of the drive shall be variable with controls to prevent the rating of the pump being exceeded. 8.5.2 For a positive displacement pump in addition to any internal pump overload by-pass, the pump or outlet pipe work shall be fitted with a separate by-pass valve set at a lower differential pressure to automatically carry any excess liquid back to the tank when the delivery valve is closed. The by-pass valve shall be suitably sized to accommodate the pump discharge flow rate. 8.5.3 If a pump minimum flow by-pass system is not provided, the design and operation shall ensure that cavitation is avoided.

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8.5.4 A suitable strainer shall be fitted upstream of the pump inlet, if required by the pump manufacturer. If the strainer does not protect the pump during uplift, provision for a second strainer shall be made. 8.5.5 Pumps shall be equipped with a sealing of high quality; simple stuffing boxes are not permissible.

8.6 Hoses The road-tanker discharge hose shall be in accordance with ISO 2928 and hose shall be sound. The road-tanker discharge hose shall be made of material suitable for LPG service and designed for a pressure at least equal to the design pressure of the pipe-work. Hoses shall be in one manufactured length without intermediate joints or couplers and shall not exceed 60 m. The road-tanker discharge hose end valves shall be protected against inadvertent opening and shall have a suitable secure storage location to prevent movement when the road tanker is in motion. The road-tanker discharge hose with their couplings shall be tested to a pressure of 1.5 times the design pressure. The minimum bend radius of the road-tanker discharge hose shall be less than the bend radius of the hose reel when fitted. The road-tanker discharge hose and hose fittings in use in the different EAC partner states are acceptable, if they conform to a relevant national specification.

8.7 Hose reel The hose reel shall be fitted with a brake assembly to allow control of the speed of the reel. Roller or spool assemblies may be located at or near the hose reel to prevent tearing or wear of the hoses by sharp edges. The hose reel shall have manual or power rewind. The power rewind shall be designed to prevent damage due to excessive rewinding.

8.8 Earthing reel The earthing reel shall have electrical continuity with the tank. 8.9 Metering system The design and materials of construction shall be suitable for use with liquid LPG and the service conditions. Cast iron shall not be used unless it has adequate ductility and resistance to brittle failure over the range of pressures and temperatures to which it may be subjected in use. Ductile iron with an elongation at fracture of less than 18 % shall not be used.

8.10 Valves Valves for road tanker LPG equipment shall comply withISO 7121 and ISO 5752. :

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, .

8.11 Pressure relief valves (PRVs) 8.11.1 PRVs shall be located in the vapour space of the tank. 8.11.2 The sizing and number of PRVs shall be in accordance with Annex B. 8.11.3 PRVs shall be sited flush with the tank shell and with the operating mechanism inside the tank, or any protrusion shall be adequately guarded against impact damage and any damage to the guard shall not interfere with the satisfactory operation of the valve.

9 Assembly 9.1 General Road tankers shall be manufactured in accordance with approved drawings and specifications. The manufacturer shall be responsible for the competence, training and supervision of their staff. The manufacturer shall ensure, taking into account any instructions from the material supplier, that the materials of the finished road tanker conform to this standard. Visual examinations of pressure containing part shall be supplemented by magnetic particle or penetrant testing in case of doubt. 9.2 Welding 9.2.1 Welding of the pressure containing parts Welding of the pressure containing parts shall conform to ISO 3834-2 and ISO 3834-3 and shall only be carried out if all the following apply: a) a welding procedure specification is compiled by the manufacturer.

b) the welding procedures selected by the manufacturer are qualified for the application.

c) the manufacturer has compiled with a welding procedure specification for each joint or family of

joints accordance with ISO 15609-1.

d) welding procedures are qualified by welding procedure tests conforming to ISO 15614-1;

e) the welders are qualified for the work in accordance with ISO 9606 and welding operators in accordance with ISO 14732, and their approval is valid;

f) a list of welders and welding operators and records of approval tests is maintained by the manufacturer.

9.2.2 Welding of the non-pressure containing parts Welding of the non-pressure containing parts and welding of attachments (temporary or otherwise), including supports, to a pressure retaining part shall follow a qualified procedure.

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9.3 Flanged connections The number of flanged connections shall be minimized. Flanges and their joints shall be selected in accordance with ISO 7005. Gaskets to be used at the flanged joints shall comply with ISO 7483. 9.4 Screwed connections Connections for pipe work up to and including 50 mm nominal bore, or for proprietary items such as pumps, valves and meters up to 80 mm nominal bore, may be threaded. 9.5 Pressure test On completion of construction, road tanker pipe work shall be subjected to a hydraulic pressure test at a test pressure of 1.5 times the design pressure specified in the design document. The first pressurisation shall be carried out under controlled conditions with appropriate safety precautions. 9.6 Leak test 9.6.1 Following the hydraulic test and final assembly the finished road tanker LPG equipment shall undergo a leak test. 9.6.2 The leakproofness test shall be carried out at low pressures. 9.6.3 Best test results are achieved at a pressure level of between 0.2 bar to 0.6 bar, as small leaks can then be more easily detected. 9.6.4 If the tank is gas free the leakproofness test pressure shall be: a) a minimum of 0.2 bar using air or nitrogen (or any other fluid compatible with the materials of the

tank and/or the item/section to be tested), and b) not less than 20 % of the test pressure. 9.6.5 If the tank is in gas service the leakproofness test pressure shall be not less than 20 % of the test pressure !carried out using" the LPG vapour pressure. 9.7 External corrosion protection Road tanker LPG equipment shall have sufficient external protection against corrosion arising from atmospheric effects. 10 Safety systems 10.1 General 10.1.1 A system shall be provided which will prevent the road tanker from being driven away while any of the following conditions apply: a) the LPG pump is running;

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b) the liquid discharge internal shut-off valve is open; c) the master switch is isolated. 10.1.2 Road-tankers for customer deliveries shall be equipped with an interlock, which ensures that the discharge hose is fully retracted before the road-tanker can be moved. 10.1.3 The following safety systems may be provided: a) remote shut-off activated by radio (see 10.2); b) Emergency Shut-Down system (ESD) or drive away protection, activated by the opening of the

valve cabinet door; c) acoustic alarm, initiated when the driver attempts to drive away while the LPG pump is still

running or the hose is not fully retracted; d) an interlock that ensures that delivery hoses are disconnected and made secure before the

road tanker is driven. 10.2 Emergency Shut-Down system (ESD) 10.2.1 The LPG equipment of the road tanker shall include an ESD system initiated by a minimum of two manual devices located at convenient positions on the road tanker and adequately labelled to indicate their use, or one manual device located on the road tanker combined with either: a) a rip cord (emergency cord) laid down on the ground beside the LPG road tanker during filling and

discharge, or b) remote systems. 10.2.2 The ESD system shall immediately initiate the shut-down of the discharge pump and the primary shut-off valve on the tank. 11 General safety requirements 11.1 Operating devices shall be capable of being operated safely without harm to the operator. The mode of operation of these devices shall be permanently marked on them if the method of operation is not obvious by virtue of its design. 11.2 Lighting shall be provided on the road tanker to enable the LPG equipment and accessories to be operated safely. 11.3 Means of reaching the elevated devices shall be provided where regular access is necessary. 11.4 Flaps, doors, hoods etc. shall be provided with means of preventing inadvertent movement or activation of related safety systems that may cause injury. 11.5 Demountable equipment e.g. fire extinguishers, shall be secured during transport. 11.6 Rotating machinery shall be guarded where necessary.

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11.7 Filling and discharge openings shall be capped or plugged when not in use. 12 Bulk LPG road tanker design and construction 12.1 Vehicle cab 12.1.1 Cab materials Only material that is not readily flammable shall be used in the construction of the driver’s cab. This provision will be deemed to be met if, in accordance with the procedure specified in ISO 3795, samples of the following cab components have a burn rate not exceeding 100 mm/min: seat cushions, seat backs, safety belts, head lining, opening roofs, arm rests, all trim panels including door, front, rear and side panels, compartment shelves, head restraints, floor coverings, sun visors, curtains, shades, wheel housing covers, engine compartment covers, mattress covers and any other interior materials, including padding and crash- deployed elements, that are designed to absorb energy on contact by occupants in the event of a crash. 12.1.2 Cab rear windows Any windows in the back of the cab shall be hermetically sealed and fitted with fire-resistant retention. 12.1.3 Roof hatch In order to prevent flammable liquid entering the cab any opening in the cab roof shall have its cover secured closed and sealed. 12.1.4 Emergency egress A means of emergency egress from the cab shall be provided for possible use in the event of a tanker rollover that results in the doors being unusable. Methods include, but are not limited to: a) the removal of an unbonded windscreen by the application of force from inside the cab, or

b) the use of the roof hatch of sufficient size and provided with a tamper-proof seal which is broken if

the cover is opened. 12.1.5 Cab heaters (combustion type) Cab heaters, other than those operated from the vehicle’s engine, shall be removed. If they remain fitted, they shall be disabled so that they cannot be made operational inside a loading terminal. The method of isolation shall be identified on a plate inside the cab on the nearside. 12.1.6 Lighter and/or auxiliary sockets Cabs shall not be fitted with electrical lighter sockets. Auxiliary sockets, if fitted, shall be provided with blanking caps in place. 12.1.7 In-cab fire extinguisher 12.1.7.1 The vehicle shall be equipped with at least one portable fire extinguisher with a minimum capacity of 2 kg of dry powder or other suitable extinguishant with an equivalent test fire rating of at least 5A and 34B as defined in 3-7suitable for fighting a fire in the engine or cab of the vehicle, and

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such that, if it is used to fight a fire involving a load, it does not aggravate the fire and, if possible, controls it. 12.1.7.2 The fire extinguisher(s) need not be suitable for fighting a fire in the engine if the vehicle is equipped with a fixed fire extinguisher suitable for fighting a fire in the engine, which works automatically or is easily brought into action. 12.1.7.3 Fire extinguishers shall be mounted so that they are readily accessible and removable by the driver when seated in the driver’s seat and wearing the seat belt. 12.1.8 Transport emergency information A suitable holder for a transport emergency information card shall be mounted in a visible location such that transport emergency card can be inserted and removed. 12.1.9 First aid and eye wash kits A first aid kit and an eye wash bottle shall be provided in suitable locations in the cab. 12.2 Fuel tank and fuel supply system 12.2.1 Fuel tank installation In the event of any leakage, the fuel shall drain to the ground without coming into contact with hot parts of the vehicle or the load. 12.2.2 Fuel supply pipework The fuel supply pipework between the fuel tank and the vehicle engine shall be installed such that it is protected against failure resulting from damage or vibration. 12.3 Engine 12.3.1 Engine type The engine propelling the vehicle shall be so equipped and situated as to avoid any danger to the load through heating or ignition. 12.3.2 Air induction system The air induction system shall be located and/or protected so as to minimise the possibility of induction of: a) flammable vapour from any leakage of product or from any release from a safety relief device on

the product tank i.e. it shall not be located close to the ground or facing the product tank;

b) particles of burning material. 12.3.3 External engine stop control Where a cargo pump, or provision to drive a cargo pump, is fitted, an external engine stop control shall be fitted on the same side of the vehicle as the pump controls. It shall be capable of stopping the engine within 5 s and its position shall be identified by a clearly visible, legible and durable notice.

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12.4 Fire screen and exhaust system protection 12.4.1 Fire-screen A fire-screen (shield) made of metal or other suitable non-absorbent material shall be fitted at the back of the cab. It shall be designed so that it: a) protects the cargo tank from a fire in the engine compartment; and b) prevents any flammable LPG vapours that may be accidentally released during the loading and

unloading operations of the road tanker from entering the engine compartment. 12.4.2 Exhaust system protection 12.4.2.1 The exhaust system, including any turbo charger and any exhaust gas after-treatment, shall be so directed or protected as to avoid any danger to the load through heating or ignition. 12.4.2.2 Where the fire-screen (12.4.1) does not provide this protection, an additional shield (or shields) shall be fitted such that any accidental leakage of LPG being loaded, carried or unloaded cannot impinge on the heated surfaces of the system. 12.4.2.3 The shield(s) shall be made of durable material and so designed that the surface temperature does not exceed 200 0C. 12.4.2.4 Where unshielded components of the exhaust system rear of the fire-screen have surface temperatures that do not exceed 200 0C in normal operation, separate shielding is not required; the components of such systems shall be identified on a clearly visible notice, preferably located inside the nearside cab door. 12.4.2.5 Parts of the exhaust system situated directly below the fuel tank shall have a clearance of at least 100 mm or be protected by a thermal shield. 12.4.2.6 A vertical exhaust may be used provided there is effective shielding and a method of preventing ingress of flammable vapours/liquids. 12.4.3 Exhaust discharge 12.4.3.1 The exhaust discharge (tail pipe) shall readily permit the attachment of a workshop exhaust extraction hose without an adaptor. 12.4.3.2 Where a cargo pump, or provision to drive a cargo pump, is fitted, the exhaust system shall discharge to the offside to direct exhaust fumes away from the driver when he is standing by the tanker control position during deliveries that are made using the pump. 12.5 Endurance braking system 12.5.1 Vehicles equipped with endurance braking systems emitting high temperatures placed behind the rear wall of the driver’s cab shall be equipped with a thermal shield securely fixed and located between this system and the tank or load so as to avoid any heating, even local, of the tank shell or the load. 12.5.2 The shield shall be made of durable material and so designed that its surface temperature does not exceed 200 0C.

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12.5.3 The thermal shield shall protect the endurance braking system against any accidental leakage of LPG cargo. A protection including a twin shell shield shall be considered satisfactory. 12.6 On-vehicle (external) fire extinguisher NOTE Requirements for the in-cab fire extinguisher are given in 12.1.7.

12.6.1 The vehicle shall be equipped with at least two portable fire extinguishers with a minimum capacity of 9 kg of dry powder each, or other suitable extinguishant with an equivalent test fire rating of at least 21A and 183B as defined in ISO 7165 suitable for fighting a tyre or brake fire or a fire involving a load, and such that, if it is used to fight a fire in the engine or cab of the vehicle, it does not aggravate the fire. 12.6.2 It is recommended that two such extinguishers shall be fitted, one on each side of the tanker, such that one extinguisher can be reached in the event that access to one side of the tanker is obstructed. 12.6.3 Fire extinguishers shall be mounted within weatherproof containers and clearly identifiable, and such that they are readily accessible and removable. 12.6.4 Horizontal mounting shall be avoided in order to assure the retention of the fire extinguisher in its container during transport, and reduce the risk of compaction in powder extinguishers where an anticoagulant has not been included to prevent compaction. 12.7 Rear protection 12.7.1 Overall design 12.7.1.1 A bumper sufficiently resistant to rear impact shall be fitted over the full width of the LPG tank at the rear. The bumper shall be in addition to the rear under-run protection device. 12.7.1.2 The face of the bumper (in elevation) shall be at least 100 mm high. 12.7.1.3 The ends of the bumper and rear under-run device shall have no sharp edges, and shall either be rounded or, if manufactured from an extruded or box section, fitted with plastic end caps. 12.7.1.4 Where the rear under-run device and/or the rear bumper form part of a step for tank top access, the foot holds shall be covered with a suitable anti-slip surface and the requirements of 12.18 shall be met. 12.7.2 Installation The bumper shall be mounted: i) so that its inside face(s) or edge(s) is (are) not less than 100 mm to the rear of the tank and its

fittings at any point; ii) no lower than the height of the chassis on rigid tankers; and iii) no lower than the height of the tank mountings on trailers and semi-trailers. 12.7.3 Strength requirements For tankers without a separate chassis (i.e. semi-trailers and trailers), the mounting of the rear under-run device and the bumper shall be designed, and validated by testing or analysis, to withstand the

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impact forces that are anticipated in a credible worst case accident scenario without generating any high stress concentrations which could affect the integrity of the tank shell for the following conditions: a) low level impact on the rear under-run device only;

b) high level impact on the bumper only;

c) simultaneous high and low level impact on the rear under-run device and bumper.

12.7.4 Bumper supports All rear protection required to be fitted shall be bolted to its supports and the supports bolted to the chassis or under-structure to enable replacement or repair without the need for hot work in situ. 12.8 Vehicle stability

12.8.1 Lateral stability

The height of the centroid of the LPG tank cross-section at half the tank length shall fall within an isosceles triangle that has a base length at ground level equal to the overall width between the outside walls of the outside tyres of the major load axles, and that has base angles not exceeding 62°. 12.8.2 Articulated vehicle load distribution In an articulated vehicle the mass on the axles on the load carrying unit of the laden semi-trailer shall not exceed 60 % of the nominal laden mass of the complete articulated vehicle. 12.9 Vehicle immobilisation Where the operation of an anti-drive away interlock is invoked that immobilises the road tanker through its park brake system (brake interlock system), the system shall be designed so that the brakes may not be released simply by re-setting the interlocked device to the safe condition. 12.10 Electrical continuity dissipation of static electrical charge A path for the dissipation of any accumulated static electrical charge shall be provided from the tank to ground through the road tanker’s suspension system, axles, wheels and tyres. For tractors (prime movers) and rigid vehicles this requirement may be restricted to the rear drive axle(s) only. The resistance level between conductive parts which provide this path shall be less than 10 Ω. Where necessary, additional bonds shall be provided such that when installed they achieve a normal value of not more than 10 Ω. 12.11 Tyres 12.11.1 Conductivity In order to dissipate static electricity, tyres shall meet the requirements of ASTM F1971-99 or other suitable test method. 12.11.2 Inflation protection It is recommended, particularly for semi-trailers and trailers that a tyre pressure monitoring system or a tyre re-inflation system be fitted.

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12.12 Mudguards Mudguards (other than those fitted to the front axle of a tractor/rigid vehicle) unless made from steel of a thickness of greater than 1.0mm shall meet the requirements of the National or any other acceptable international fire resistance test standard and passed as suitable for use on petroleum road tankers. 12.13 Cab telephone and data transfer RF telecommunication systems Where a cab telephone or any other data transfer and communication equipment is fitted, it shall comply with the National or any other acceptable international standards for radio telephone, communication and data transfer equipment and its installation in petroleum road tankers. 12.14 Air brake connection for towing A male 'C' type brake coupling with non-return valve and cap shall be provided under the front bumper to facilitate the connection of an external compressed air supply, in order that the tanker’s spring brakes may be readily released in the event of it being disabled on a loading gantry. 12.15 Tractor/Semi-trailer coupling height compatibility A clearly visible, legible and durable notice shall be attached to the tractor in the area adjacent to the fifth wheel, on the right hand side, giving the design coupling height for matching to a semi-trailer. 12.16 Air suspension 12.16.1 Ride height control Where a system exists to allow the height of a road tanker to be varied via the suspension, it shall incorporate an automatic reset to ensure a return to the standard ride height once the road tanker is moved. 12.16.2 Discharge assistance by suspension height Where air suspension is raised or lowered to provide the required slope for drainage of LPG from the tank and particularly in pumped deliveries/unloading, the slope shall be not less than 1:20 12.17 Tractor/Trailer mechanical coupling To prevent damage to tank foot valves, pipe work and associated flanges during articulation (in horizontal and vertical planes, and combinations thereof), it shall be verified that there is full compliance with ISO 1726 including all equipment fitted not within the scope of the standard such as mudguards, tail lamp brackets and lead-up ramps. 12.18 Access, ladder and platforms Any access facility to the tank, tank top or chassis (including for the purposes of accessing the tractor trailer couplings where not fitted at ground level) shall meet relevant national regulations or standards, or otherwise as a minimum shall be designed such that: a) the first step height does not exceed 550 mm from the ground;

b) the intermediate steps are equally spaced and do not exceed 300 mm apart;

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c) there is a toe hold clearance of 130 mm minimum;

d) the access steps preferably slope inwards; and

e) hand holds are fitted above the height of the top step/rung/platform. Platforms for access to

tractor-trailer couplings, where the couplings are not located for access from ground level, shall

extend to the full width of the chassis and, longitudinally, as close as practicable to the fifth wheel

coupling to prevent the possibility of falling between the chassis members when making

connections.

12.19 Provision for roll-off ferry operations Where the road tanker may be used on roll-on roll-off ferries and the ferry operator may require the vehicle to be secured during transit, lashing lugs shall be provided in accordance with ISO 9367-1 Attention shall be given to ensuring adequate clearance around all components for the securing chains that may be used. 12.20 Electrical equipment

12.20.1 Batteries 12.20.1.1 The battery terminals shall be electrically insulated or covered by an electrically insulated battery box cover. 12.20.1.2 If the batteries are not located under the engine bonnet, they shall be fitted and secured in a suitably vented box which shall be located as close as reasonably practicable to the rear of the cab. The box shall also prevent any leakage of flammable liquid or vapours from coming into contact with the battery connections, 12.20.2 Battery master switch 12.20.2.1 The master switch shall include double pole switching to isolate outgoing circuits from both poles of the battery and shall be placed as close to the battery as possible. 12.20.2.2 Where controlled isolation of electronic control modules (ECMs) is required, a delay (for all circuits if necessary) of up to 10 s may be provided. 12.20.2.3 It shall be possible to open the switch while the engine is running, without causing any dangerous excess voltage. Operation of the switch shall not constitute a fire hazard in an explosive atmosphere. The casing of the switch shall meet the requirements of protection degree IP65 in accordance with IEC 60529. 12.20.2.4 The cable connections on the battery master switch shall have a protection degree meeting the requirements of at least IP54 in accordance with IEC 60509. However, this does not apply if these connections are contained in a housing which may be the battery box. In this case it is sufficient to insulate the connections against short circuits, for example with an effective rubber cap which shall also prevent any spillage of flammable liquid from coming into contact with the connections. 12.20.2.5 To maintain the integrity of any intrinsically safe circuits remaining powered when the master switch is in the 'OFF' position, the switch shall have contacts capable of achieving physical separation for isolation purposes to the requirements specified in IEC 60079 -0 and IEC 60079-11. .

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12.20.2.6 A control device to facilitate the disconnecting and reconnecting functions of the switch shall be installed in the driver's cab. It shall be readily accessible to the driver (i.e. when seated and wearing a seat belt) and be distinctively marked. It shall be protected against inadvertent operation by either adding a protective cover, by using a dual movement control device or by other suitable means. If the operation of the control device is electronically operated it shall comply with 12.20.4. 12.20.2.7 At least two additional external control devices shall be installed, one on either side of the tanker to the rear of the cab. Their location shall be identified by legible and durable notices, clearly visible from the sides of the vehicle, with characters at least 10 mm high or, if a symbol, at least 100 mm high. 12.20.2.8 Green warning lamps shall be provided adjacent to the external control devices, illuminated when the master switch is "ON", and visible by the driver in the operating position when loading and discharging. 12.20.2.9 A lamp or lamps (which may be the front outline marker lamps on the cab) shall be illuminated, visible from the front of the vehicle, when the master switch is "ON". 12.20.3 Wiring systems 12.20.3.1 For tractors and rigid vehicle chassis, the electrical system shall be installed in accordance with one of the following: a) an insulated return standard where the vehicle chassis is 'floating' electrically and is not connected

to either the negative or positive pole of the battery, with all electrically powered equipment having supply and return cables, or

b) a chassis return standard where the negative pole of the battery is connected from the negative

terminal on the battery master switch (switched side) to the vehicle chassis, with electrically powered equipment having a supply cable and the return via connections to the chassis.

c) an insulated return standard but where a connection is made from the negative terminal on the

battery master switch (switched side) to the manufacturer’s dedicated earth point. A suitable plate or notice shall be fitted inside the cab clearly visible through the nearside door aperture indicating which of the above electrical systems is fitted.

12.20.3.2 For semi-trailers and trailers the electrical system shall be installed to an insulated return standard where the trailer-tank structure is 'floating' electrically and is not connected to either the negative or positive pole of the battery (via the trailer connection). All electrically powered equipment shall have supply and return cables connected to the trailer electrical connection with no connection made to the tank structure. 12.20.4 Wiring circuits 12.20.4.1 The size of conductors shall be large enough to avoid overheating and shall be adequately insulated. 12.20.4.2 All circuits shall be protected by fuses or automatic circuit breakers, except: a) from the battery to cold start and stopping systems of the engine;

b) from the battery to the alternator;

c) from the alternator to the fuse or circuit-breaker box;

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d) from the battery to the starter motor, but this shall not include the relay operated by the ignition

switch;

e) from the battery to the power control housing of the endurance braking system, if this system is

electrical or electromagnetic;

f) from the battery to the electrical lifting mechanism for lifting the bogie axle.

12.20.4.3 The above unprotected circuits shall be as short as possible. 12.20.4.4 Fuses and circuit breakers shall be: a) fitted in a suitable enclosure and rated for the smallest conductor being protected;

b) marked with the maximum fuse/circuit breaker rating; and

c) open-circuit within 10 s (fuses) and within 30 s (thermal circuit breakers) when passing a current of

twice their rating.

12.20.4.5 Cables shall be securely fastened and positioned in such a way that the conductors are adequately protected against mechanical and thermal stresses. 12.20.4.6 On vehicles with the electrical system installed to the chassis return standard; a) The negative pole of the battery shall be connected to the chassis (or structural member attached directly to it), via the master switch, in the vicinity of the battery box at the manufacturer’s designated connection. No other electrical equipment shall be connected to the chassis at this point. b) All other electrical connections to the chassis shall only be forward of the fire screen at points designated by the vehicle manufacturer and in the manner used by the manufacturer in order to provide a reliable and durable earth point. The designated points shall be clearly labelled with non-corroding tags. The location of the chassis earth point(s) shall be clearly shown on a durable plate which is readily visible on the vehicle. A combined plate may be used, showing the location of the chassis earth points and which wiring system is used. c) The wiring to the rear of the cab and external to the cab shall use an insulated return to one of the electrical connections to the chassis in (ii) above; this includes headlamps, side lamps, fog-lamps, end outline marker lamps and indicators, but excludes any wiring to the engine, clutch, and gearbox. 12.20.4.7 All supply and return circuits shall be connected to the master switch. Permanently energized installations certified for use in a hazardous area shall be connected to the battery side of the switch. All other installations shall be connected to the switched side of the switch. NOTE Connection of permanently energized circuits to the master switch, rather than the battery, minimises the risk of damage to their cables and connections. 12.20.4.8 The nominal circuit voltage of any circuit on the vehicle shall not exceed the nominal voltage of the battery installed on the vehicle. 12.20.4.9 Control switches should, wherever practicable, be on the live side of the circuit. The cab interior light circuit and sensors on the engine, gear box and axles are recognised exceptions. Wherever practicable circuits should be provided with control switches. 12.20.4.10 Cables shall have copper or precious metal conductors except for heavy duty cables from the battery to the starter motor which may be aluminium provided compression terminals are

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used. The terminals on all heavy duty cables shall be secured to the cables in a manner which ensures an adequate surface area contact to avoid overheating, such as by soldering, crimping or swaging; simple clamping screws should not be used. 12.20.4.11 Electronic control modules (ECMs) Where one or more ECMs (including those for engine management) are fitted that may continue to require power for a period in excess of 10 s after the operation of the battery master switch control, the ECMs shall be in accordance with the requirements for permanently powered equipment. 12.20.4.12 Provisions concerning that part of the electrical installation situated to the rear of [and external to] the driver’s cab 12.20.4.13 The whole installation shall be designed, constructed and protected such that it cannot create any ignition source or short circuit under normal conditions of use of vehicles and that these risks can be minimised in the event of an impact or deformation. It shall be resistant to degradation by contact with petroleum products. 12.20.4.14 Wiring shall be protected against impact, abrasion and chafing during normal vehicle operation. The sensor cables of anti-lock braking devices do not need additional protection provided they are adequately supported and suitably shielded from heat and accidental damage: similarly sensor cables of other electronic systems such as electronically controlled braking systems (EBS) do not require additional protection. 12.20.4.15 All wiring branches shall be made in secure junction boxes with fixed terminals or in moulded conduit branches. 12.20.4.16 The following electrical connections shall not be used: a) open contacts;

b) wiring systems that obtain connection by piercing insulation;

c) push-in connections unless fitted with a durable mechanical latch.

12.20.4.17 Electrical connections between motor vehicles and trailers shall have a protection degree of at least IP54 in accordance with IEC 60509, and be designed to prevent accidental disconnection. 12.20.4.18 Lamp bulbs with a screw cap shall not be used. 12.20.4.19 Electrically heated/adjustable external mirrors shall be contained within a stout resilient housing and have any heating element securely bonded to the mirror. 12.20.4.20 The requirements tabulated below apply to any electrical equipment installed adjacent to tank service equipment that may vent to atmosphere including the flanged connections for LPG liquid/vapour loading and unloading operations.

Table 3 — Requirements of distance of electrical equipment adjacent to a tank service equipment

Distance from source of vapour/liquid release Equipment requirement

≤ 500 mm Situable for Zone 2

> 500 mm ≤ 1 000 mm IP65

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> 1 000 mm No restriction

12.20.4.21 A socket for a battery boost and/or inter-vehicle start facility should be fitted in the event that the road tanker’s batteries become discharged. The socket shall be connected to the switched side of the battery master switch and fitted inside the battery box or its own protection box. 12.20.5 Permanently energised installations (including on-board computers) 12.20.5.1 Those parts of the electrical installation including the leads which shall remain energized when the battery master switch is open, shall be suitable for use in hazardous areas. Such equipment shall meet the general requirements of IEC 60079, Parts 0 and 14 and the additional requirements applicable from IEC 60079, Parts l, 2, 5, 6, 7, 11, 15 or 18. 12.20.5.2 Permanently energized electrical equipment, including the leads, shall meet the requirements for Zone 1 for electrical equipment in general or meet the requirements for Zone 2 for electrical equipment situated in the driver’s cab. The requirements for the explosion group IIC, temperature class T6 shall be met. However, for permanently energized electrical equipment in an environment where the temperature caused by non-electrical equipment situated in that environment exceeds the T6 temperature limit, the temperature classification of the permanently energized electrical equipment shall be at least that of the T4 temperature class. 12.20.5.3 Bypass connections to the battery master switch for electrical equipment which shall remain energized when the battery master switch is open (i.e. permanently powered) shall be protected against overheating by suitable means, such as a fuse, a circuit breaker or a safety barrier (current limiter).

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Annex A (normative)

Calculation of mountings of tank to the chassis

A.1 General

Mountings shall be capable of withstanding, under the maximum admissible load, forces as given in Table A.1 below.

Table A.1 — Forces for fixing the tank to the road tanker

Direction Definition Force N

In the direction of travel F1 = twice the force applied by the total mass

2 g P3

At right angles to the direction of travel

F2 = the force applied by the total mass 1 g P3

Vertically upwards F3 = the force applied by the total mass 1 g P3

Vertically downwards Not relevant in this calculation -

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Figure A.1 — Forces for fixing the tank to the road tanker

Characteristics of the tank:

Tare weight = P1 (kg)

Maximum load = P2 (kg) = volume in litre x filling ratio in kilogramme/litre

Total mass = P3 (kg) = P1 + P2

A.2 Mounting of tank to the chassis

A.2.1 Fixing rods

Number of fixing rods N 1

Mechanical characteristics of steel:

a) Ultimate tensile strength R m1 (N/mm²)

b) Yield strength R e1 (N/mm²)

c) Cross sectional area of the rod (internal to thread) S 1 (mm2)

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A.2.2 Bolts

Number of fixing rods N 2

Mechanical characteristics of steel:

a) Ultimate tensile strength R m2 (N/mm²)


c) Cross sectional area of the rod (internal to thread) S 2 (mm2)

A.2.3 Bracket welds

Area of weld section contributing to bracket strength (see Figure A.3):

2

213 22 mmbLLS

Mechanical characteristics of the material of the bracket welds:

a) Ultimate tensile strength Rm3 (N/mm²)


A.2.4 Allowable stress

75,0 or mR5,0

A.2.5 Typical mounting (example)

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Key

d height of tank centre line above chassis (mm)

L outer width of chassis (mm)

1 Fixing rods

2 Brackets

Figure A.2 — Typical mounting of tank

Moment produced by F2

NmmFdM 22

Reaction to M2 produced by fixing rod:

NL

Fdf 2

2

A.3 Calculation of fixing rods

A.3.1 In the direction of travel

Tensile stress in the rods:

2

11

11 / mmN

NS

F

Allowable stress:

2

1 Nmm

Where 175,0 eR or R5,0 (whichever is the lower)

A.3.2 At right angles to the direction of travel


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2

11

22

2

NmmN

S

f

Allowable stress:

2

2 Nmm

Where 11 5,075,0 me RorR whichever is lower

A.3.3 Vertically upwards


2

11

33 Nmm

NS

F

Allowable stress:

2

3 Nmm

Where 11 5,075,0 me RorR (whichever is lower)

A.4 Calculation of the bracket welds

A.4.1 General

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Figure A.3 — Bracket welds


Since the number of brackets is equal to the number of fixing rods:

2

13

14 Nmm

NS

F


2

13

25

2

NmmN

S

f


2

13

36 Nmm

NS

F

Allowable stress (the lowest of these values shall be considered):

2

4 Nmm

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2

5 Nmm

2

6 Nmm

Where 11 5,075,0 me RorR (whichever is lower).

A.5 Calculation of fixing bolts

Key

1 Bracket

2 Chassis frame

3 Bolts

Figure A.4 — Fixing bolts


NN

Ff

1

17

2

22

17 Nmm

NS

f

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NN

fF

2

1

28

NN

f

2

1

88


27 Nmm

2

8 Nmm

2

9 Nmm

Where 11 5,075,0 me RorR

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© EAC 2015 – All rights reserved

Annex B (Normative)

Discharge rates for pressure relief valves

B.1 Discharge capacity Pressure relief valves shall be sized for full fire engulfment using the formula given below. The discharge capacity given by the following formula is based on accumulating conditions e.g. 120 % above the start-to-discharge pressure of the safety relief valve. Pressure relief devices shall be capable of discharging air at a rate of flow Q (in cubic metres per hour) given by the following equation:

M

TZ

CL

FAQ

82,0

45320

Where

Q is the required air discharge capacity (m3/h) at atmospheric pressure and 15 °C; A is the total external surface area of tank (m2); Z is the gas compressibility factor at the accumulating condition. If unknown a value of Z = 1.0 shall be used; T is the absolute temperature (in K) above the pressure relief valve at the accumulating condition; L is the latent heat of evaporation (kJ/kg) at the accumulating condition M is the relative molecular mass of the gas; C is the constant based on the ratio of specific heat capacities of the gas, K = Cp/Cv (see Table B.1). A value of 0.606 corresponding to a ratio of 1.0 shall be used in the absence of definite data. F is a coefficient with the following value: F =1 for un-insulated tanks and

381800

6498 tuF

for insulated tanks

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Where

u is the overall thermal conductance of the insulation determined at 37.8 °C (kJ/m2 per hour per degree Celsius); t is the temperature of the tank contents (º C). If unknown a value of t = 15 °C shall be used. The value of F shall in no case be taken as less than 0.25;

Table B.1 — Constant C for gas or vapour related to the ratio of specific heat

capacities (K = Cp/Cv) at standard conditions

K C K C K C

1.00 0.606 1.32 0.671 1.64 0.722

1.02 0.611 1.34 0.674 1.66 0.725

1.04 0.615 1.36 0.677 1.68 0.728

1.06 0.620 1.38 0.681 1.70 0.731

1.08 0.624 1.40 0.685 1.72 0.734

1.10 0.628 1.42 0.688 1.74 0.736

1.12 0.633 1.44 0.691 1.76 0.739

1.14 0.637 1.46 0.695 1.78 0.742

1.16 0.641 1.48 0.698 1.80 0.745

1.18 0.645 1.50 0.701 1.84 0.750

1.20 0.649 1.52 0.704 1.88 0.755

1.22 0 0.652 1.54 0.707 1.92 0.760

1.24 0 0.656 1.56 0.710 1.96 0.765

1.26 0 0.660 1.58 0.713 2.00 0.770

1.28 0 0.664 1.60 0.716 2.04 0.774

1.30 0 0.667 1.62 0.719

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Bibliography

EN 287-1, Qualification test of welders— Fusion welding — Part 1: Steels

EN 549, Rubber materials for seals and diaphragms for gas appliances and gas equipment

EN 558-1, Industrial valves- Face-to-face and centre-t-face dimensions of metal valves for use in flanged pipe systems — Part 1: PN-designated valves

EN 837-2, Pressure gauges- — Part 2: Selection and installation recommendations for pressure gauges

EN 1012-1, Compressors and vacuum pumps — Safety requirements -— Part 1: Compressors

EN 1418, Welding personnel — Approval testing of welding operators for fusion welding and resistance weld setters for fully mechanized and automatic welding of metallic materials

EN 1591-1, Flanges and their joints- Design rules for gasketed circular flange connections — Part 1: Calculation method

EN 1762, Rubber hoses and hose assemblies for liquefied petroleum gas, LPG (liquid or gaseous phase) and natural gas up to 25 bar(2.5 MPa) — Specification

EN 1983, Industrial valves — Steel ball valves

EN 1984, Industrial valves — Steel gate valves

EN 10025, (all parts), Hot rolled products of structural steels

EN 10028, (all parts), Flat products made of steel for pressure purposes

EN 10045-1, Metallic materials- Charpy impact test — Part 1: Test method

EN 10204, Metallic products — Types of inspection documents

EN 10216-1, Seamless steel tubes for pressure purposes — Technical delivery conditions — Part 1: Non-alloy steel tubes with specified room temperature properties

EN 10217-1, Welded steel tubes for pressure purposes- Technical delivery conditions — Part 1: Non-alloy steel tubes with specified room temperature properties

EN 12074, Welding consumables — Quality requirements for manufacture, supply and distribution of consumables for welding and allied processes

EN 12627, Industrial valves -— Butt welding ends for steel valves

EN 12760, Valves- Socket welding for steel valves

EN 13175:2003+A2, Specification and testing for liquefied petroleum gas (LPG) tanks valves and fittings

PUBLIC R

EVIEW DRAFT

DEAS 902 : 2016


EN 13709, Industrial valves — Steel globe and globe stop and check valves

EN 13789, Industrial valves — Cast iron globe valves

EN 13799, Contents gauges for LPG tanks

EN 14422, Clamp type coupling assemblies for LPG transfer hoses

EN 14424, Hose fittings with screwed connections

ASTM F1971-05, Standard test method for electrical resistance of tires under load on test the bench

EN 50014, Electrical apparatus for potentially explosive atmospheres — General requirements

EN 50020, Electrical apparatus for potentially explosive atmospheres — Intrinsic safety ‘i’

KS 91, Specification for liquefied petroleum gas

EN 50039, Electrical apparatus for potentially explosive atmospheres — Specification for intrinsically safe electrical system ‘i’

EN IEC 60529, Specification for degrees of protection provided by enclosures (IP code)

EN 60079-14, Electrical apparatus for explosives gas atmospheres — Electrical installations in hazardous areas (other than mines)

Documents

Bulk LPG road tankers Assembling Requirements DRAFT ...— Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys IEC 60079-0, Electrical apparatus for explosive