5903Recommendations for safety devices for gas cylinders.pdf

Is : 6803-1970(Reeffkmed 1990)

Indian Standard Reamrmed98)RECOMMENDATION FOR

SAFETY DEVICES FOR GAS CYLINDERS

(Fourth Reprint AUGUST 1991)

UDC 62164202:621-781

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADuR -SHAH ZAFAR MARG

NEW DELHI 110002

Gr 5 April 19?1

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IS:5903-1970

Indian Standard RECOMMENDATION FOR


Gas Cylinders Sectional Committee, EDC 16

Chairman

SHRI S. C. ROY

Members

Representing

Chief Inspectorate of Explosives ( Ministry of Indus- trial Development & Internal Trade ), Nagpur

SHRI M. P. MUKAERJI ( Altnatc to Shri S. C. Roy )

SHRI M. R. ANANTIIANARAYANAN Bombay Foods Private Ltd, Baroda SHHIS. P. BAHL Kosan Metal Products Ltd, Bombay

SHRI GEORQE P. AROOJIS ( Alfcrnatc ) SHRI T. G. BALL Tube Investments of India Ltd, Calcutta SHRI S. C. BANERJEE Directorate General of Technical Development,

New Delhi SERI C. B. CKU~H ( Alternate )

SRRI S.K. BANERJEE Mining and Allied Machinery Corporation Ltd, Durgapur

SERI N. KRISHNAMURTRY (Alternate) SARI S. R. BHISE National Safeety Council, Bambay SARI BINOY~~HAKRABORTY Hindu&an Steel Ltd, Ranchi

SHRI V. V. Rao ( Alternate ) DEPUTY DIRECTOR GENERAL OF Directorate General of Observatories, New Delhi

OBSERVATORIES ( INSTRUMENTS) h&TEoROLOQIST ( Alternote)

SARI L. R. GIUTAM The DCM Chemical Works, New Delhi SHRI SATPAL ( Alternate )

SHRI A. GHOSH National Test House, Calcutra SHRI ALBERT JEAVONS The Indian Sugar & General Engineering Corpora-

tion, Yamuna Nagar SHRI AMARJIT WADRAVAN (Altematc)

SRRI S. K. KAANDEKAR Vanaz Engineers Private Ltd, Bombay SHRI A. R. A. KRI~HNAN *Ministry of Defence ( DGI )

SHRI L. C. BHANDARI (Alternate ) SHRI S. N. LAL Indian Oil Corporation Ltd, Bombay SHRI RAJENDRANATH ~Gannon Dunkerley & Co Ltd, Bombay

SHRI S. N. SHAH ( Alhrnate ) SHRI K. RAYANATHAN The Mettur Chemical & Industrial Corporation Ltd,

Mettur Dam SHRI M. PADMANABEAN ( Alternate )

SHRI G. K. RAO Ministry of Defence ( R & D ) SHRI TRILOK SINGE ( Al&mute )

( Contin& on page 2 )

BUREAU OF INDIAN STANDARDS MANAK -BHAVAN, 9 BAHADUK SHAH ZAFAR MARG

NEW DEIHI 110002-

IS: 5903-1970

( Continuedfrom Pugc I )Mtrnbcrs R@rasthg

SHIII H. S. RAO Lloyds Register of Shipping, BombaySnra J. N. GOSIVAhtT ( Ahrnafe )SfiRI D. MADEOK ( .dhrnate )

REEWESEXTATIVE Indian Oil Corporation Ltd, BombaySHRI R. X. Sum Iiindustan Gas & Industries Limited, CalcuttaSmu C. M. SHAR Tata Chemicals Ltd, Okhamandai

SHRI S. E*LAERISEXAN ( Aftrrrrate)SimI T. P. L. SINHA Indian Air Gases Limited, ?vfughalsaraiSREX D. V. SUBBA RAO Fertilizer Corporation of India Ltd, Dhanbad

SFZRTBRUPINDAR 3-ATE ( Alternate)SHRI G. N. TAOORE Indian Oxygen Ltd, Calcutta

SHRI D. S. MADAN ( Ahnafc )SHRI G. N. VADEHRA Industrial Gases Ltd, CalcuttaStiRI K. K, VkRSrrNEY Hyderabad Allwyn Metal Works Limited, HyderabadSnRl M. V. PATANKAR, Director Getteral, 1S1 ( Ex-o@io Mrm6cr )

Director ( Mech Engg ) ( SCcrdary )

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IS :5903-1970

[Man StandardRECOMMENDATION FOR


0. FOREWORD0.1 This lncli~n Standard was adopted by the Indiart Standards Institu-ti,)n on 5 C)ctol)cr 1970, after the draft finalized by the Gas CylindersSectional Committee had ken approved by the Nfechanical EngineeringDivision Council.

0.2 This standard has been prepared to provide guidance on the require-ments of safety devices used for gas cylinders.

0.3 hfanu[acture, possession and use of any gas when contained in cy]in.ders it~ a compressed or liquefied stare are regulated under the GasCylinder Rules, 1940 of the Government of India. This specification hasbeen prepared in consultation and agreement with the statutory authori.ties under those rules,

0.4 l}hils~ all essential requirements have been set out in considerabledetails, other requirements are purposely left out to permit a reasonabledegree of latitude to designers and users.

0,5 In the preparation of this standard, considerable assistance has beenderived from the following:

A.S. B 28i-1969 Safety devices for gas cylinders. Standards Associa.tion of Australia,

CG.4 Pamphlet S: 1. I Safety relief device standards. Part I Cylindersfor compressed gases. Compressed Gas Association, U.S.A.

0.6 \\here provision is made in this standard for -certain details to besettled h~ agreement between the purchaser and the manufacturer, \t shallbe understood that, where applicable, such details are subject also toagreement by the-Chief inspector of Explosives, Nagpur.

0.7 For the purpo~e of deciding whether a particular requirement of thisstandard is complted With, the final value, observed or calculated, express-ing the result of a test, shall be rounded OF in accordance with 1S: 2-196o*.The number of significant places retained in the rounded off value shouldbe the same as that of the specified value in this standard.

lRules for rounding off numerical values ( rccijd ).

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IS : 5903 - 1970

1. SCOPE

i.1 This standard covers requirements for the design, construction, testing and certification of safety devices for gas cylinders.

2. TERMINOLOGY

2.0 For the purpose of this standard, the following definitions shall apply.

2.1 Approach Channel-The passage or passages through which gas must pass from the cylinder to reach the operating parts of the safety device.

2.2 Bursting Disc-An operating part of a safety device in the form of a disc, usually of metal and which is so held as to close the safety device channel under normal conditions. The disc is intended to burst at a predetermined pressure to permit the escape of gas.

NOTE - Such discs are generally flat, preformed, reinforced, or grooved types.

-2.3 Combination Bursting Disc-Fusible Plug - A bursting disc in combination with a low melting point fusible metal, intended to prevent the disc bursting at its predetermmed bursting pressure unless the temperature also is high enough to cause yielding or melting of the fusible metal.

2.4 Combination Pressure-Relief Valve -Fusible Plug -A safety device utilizing a pressure-relief valve in combination with a fusible plug. This combination device may be an integral unit or separate units and is intended to open and to close at predetermined pressures or to open at a predetermined temperature.

2.5 Discharge Channel -The passage or passages beyond the operating parts through which gas must pass to reach the atmosphere exclusive of any piping attached to the outlet of the device.

2.6 Flow Capaciq-The capacity in cubic metre per hour of free air discharged at the required flow rating pressure.

2.7 Flow Rating Pressure-The pressure at which a safety device is rated for capacity.

2.8 Free Air or Free Gas -Air or gas measured at normal atmospheric pressure and a temperature of 15C.

2.9 Fusible Plug- An operating part in the form of a plug of suitable low melting point material, usually a metal alloy, which closes the safety device channel under normal conditions and is intended to yield or melt at a predetermined temperature to permit the escape of gas.

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2.10 Liquefied. Gas -For the purposes of fIqw capacity assessment a gas which, under the charging pressure, is-partially liquid at a temperature of 21C. A flammable compressed gas which is normally non-liquefied at 21C, but which is partially liquid under the charging pressure and temperature, is also deemed to be a liquefied gas.

2.11 Operating Part -The part that normally closes the safety discharge channel but when moved from this position as a result of the action of heat or pressure or a combination of the two, permits escape of gas from the cylinder.

2.12 Non-liquefied Gas-For the purposes of flow capacity assessment, a gas, other than a gas in solution, which, under the charging pressure, is entirely gaseous at a temperature of 21C.

2.13 Pressare Opening -The orifice against which the bursting disc functions.

2.14 Pressure-Relief Valve - A safety device containing an operating part that is held normally in a position closing the safety device channel by spring force and is intended to open and to close at predetermined pressures.

2.13 Rated Bursting Pressure ( of a Bursting Disc) -The maximum pressure at which the disc is designed to burst at the rated temperature when in contact with the pressure opening for which it was designed, when tested as required in 7.2.2.

2.16 Rated Temperature (of a Bursting Disc) -The temperature at which a bursting disc is designed to burst when the rated bursting pressute is applied to the disc and when it is in contact with the pressure opening for which it was designed. Unless otherwise specifed and stated, it is to be taken as 65C.

2.17 Reinforced Fusible Plug- A fusible plug consisting of a core of suitable material having a comparatively high yield temperature surround- ed by a low melting point fusible metal of the required yield temperature.

2.18 Safety Device -A device intended to prevent rupture of a cylinder vnder abnormal conditions of exposure.

NOTE - The term as used herein includes the approach channel, the operating parts, and the discharge channel ( see 2.1,2.5 and 2.11).

2.19 Safety Device Channel -The channel through which gas released by operation of the device must pass from the cylinder to the atmosphere exclusive of any piping attached to the inlet or outlet of the device.

2.20 Set Pressure (of a Pressure-Relief Valve) -The minimum pressure at .which a pressure-relief valve is set to start-to-release (see 6.1.4).

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1s-s5903-1970

2.21 Start-to-Release PressSSre (of a Pressure-Relief Valve }Thepressure at which the first bubble appears through a water seal of not over100 mm on the outlet of the pressure-relief valve (see X5).2.22 Test Pressure of the Cylinder The internal pressure required forhydraulic stretch or pressute test of the cylinder.

2.23 Type Test A test applied to a represen~ative sample of each designor modifir.alion~ of a safety device to establish the adequacy or ~he designor modification ( see 7).2.24 Yield Temperature (of a Fusible Plug) The temperature atwhich the fusible met al or alloy will yield when tested as requiredin 7.3.2.4.

3. TYPES OF SAFETY DEVICES

3.1 Types of Safety Devices Types of safety devices covered by thisspecification are designated as follow.

3.1.3 Tgfie 13D Bursting disc.3.1.2 Type FP1 Fusible plug Or reinforced fhsible plug utilizing a

fusible alloy with yield temperature not over 77 CC, nor less than 69=C( 74CC nommal ).

3.1.3 Ty/12 FPt Fusible plug or reinforced fusible plug, utilizing afusible alloy with yield temperature not over 104C, nor less than 98C{ 100C nominal).

3.1.4 Type BD/FPl Combination bursting discffusib]e plug, utiiizingfvsil~le allov with yield temperature not over 77C, nor iess than 69C( 74C nom;nal ).

3.1.5 Tyfv BD/FPa Combination bursting disc/fusible plug, utilizing afusible alloy with yield temperature not over 104C, nor less than 98C( 100=C nominal).

3.1.6 Type PRV Pressure-reIief valve.

3.1.7 Type PRV/FP Combination pressure-relief valve/fusible plug.

4. 1NFORMATION TO BE SPECIFIED BY THE PURCHASER

4.1 The purchaser in his enquiry and order shall supply .w@icient infor-mation to fully identify the fitting required including, where appropriate,the following:

a) Name of gas for use with safety device;b) Type of safety dwice ( scc 3);c) Set pressure in kgfjcrnz(gauge ) (for pressure-relief valves); .

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5.1.3 Combination Bursting Disc/ Fusible Plug -- In combination bursting disc/fusible plug devices, the fusible metal shall be on the discharge side of the bursting disc. The fusible metal shall not be used in place of a gasket to seal the disc against leakage around the edges. Gaskets, if used shall be of material which will not deteriorate when in contact with the gas to be contained at the maximum temperature specified for the fusible metal.

6.1.4 Pvssurz- Rt lief Valces

6.1.4.1 When a pressure-relief valve is used on a compressed gas (liquefied or non-liquefied) cylinder, the flow rating pressure shall not exceed the minimum test pressure of the cylinder on which the pressure- relief valve is installed and the resealing pressure shall not be less than 70 percent of the minimum test pressure of the cylinder.

6.1.4.2 The set pressure shall be not less than 80 percent of the minimum required test pressure of the cylinder on which the pressure- relief valve is installed.

6.1.4.3 The design of the pressure-relief valve shall be such that the valve will have direct communication with the vapour space of the cylinder when in normal use and the possibility of unauthorized adjustment will be minimized.

6.l.5 Combination Pressure-Relief Valalr~e/Fusiblc Plug- A combination pressure-relief valve/fusible plug safety device shall meet the following requirements:

a) If 100 percent of the required flow capacity .is provided by a pressure-relief valve, the supplementary fusible plug may be either Type FP1 or FPs.

b) Where the pressure-relief valve provides less than 100 percent of the required flow capacity, the ~balance shall be supplied by a Type EP1 fusible plug.

c) Where the flow capacities of a pressure-relief valve and a Type FPr fusible plug are to be combined to provide the required flow capacity, the minimum flow capacity to be provided by the fusible plug shall be that calculated as follows:

Using the total water capacity of the container, the flow capacity for a pressure-relief valve shall be calculated by using the formula in 6.2.4 or 6.2.5; the flow capacity of the pressure-relief valve shall then be divided by the.calculated flow capacity required to obtain the percentage provided by the pressure-relief valve; the remaining percentage for the fusible plug shall then be multiplied by total ;

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1s 15903 - 1970

water capacity to obtain the water capacity figure for use in calculating the minimum flow capacity to be provided by the fusible plug, using the formula in 6.2.2 or 6.2.3.

Example:

Liquefied gas; a 450~litre water capacity cylinder; a pressure-relief valve with flow capacity 2 060 ma/h at 35 kgf/cms (absolute).

Using formula in 6.2.5

Qp = 0.164 PIVC =0*164x35 x 450

Q,, = 2 580 ma/h 2 ~060 - = 80 percent by pressure-relief valve 2 580

Using formula in 6.2.3

20 percent of 450 = 90 litre water capacity

Q. = 1.148 JVC = 1.148~ 90 = 103.3 ms/h flow capa-

city at 7 kgf/cms (absolute) provided by fusible plug

Where Q. is the flow capacity at 7 kgf/cm* (absolute) test pressure in ms/h of free air.

62 plow crpacity of S&ty Devicea

6.2.1 Ccncrtsl-The flow capacity ofeach design and modification thereof of all types of safety devices shall be ~determined from the relevant formula in 6.2.2 to 6.2.5 by an actual Aow test in accordance with 7.1.1.

6.2.2 Safety Devices for USC with Non-liquejcd Gas (Except Pressure-Relief Vulves ) -The minimum required flow capacity of safety devices, except pressure-relief valves, for installation in non-insulated cylinders for non- liquefied gas shall be ctilculated by the following formula:

Q. = o-574 Wa

where

0. = flow capacity at 7 ~kgf/cm* (abrolute) in ma/h of free air, and

w, = water capacity of the cylinder in litres, which in any case shall not be taken as less than 10 litres.

NoTI - The above formula expreaen flow capacity rquirementa qual to 70 rccnt of that which will dkhu e through a perfcet orifice ( having @ 15 mm* area or each litre of water capacity of&e cylinder ).

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6.2.3 Safep Decices for Use with Liqueyied Gas { Except Pressure-Re[iefValues)

The minimum required flow capacity of safety devices, exceptpressure-relief valves, for installation in non-insulated cylinders for lique-fied gas shall be calculated by the following formula:

Q,= 1.148 Iic

where

Q. = ~ly capacity at 7 kgf/cm* ( absolute) in m3/h o~free air,

II, = water capacity of the cylinder in litres, which in a]]y caseshall not be taken as less than 10 litres.

NOTE The above formutz expresses Ilow capacity requirements equal to 35 percentof that which will clischargc lhrough a perfect orifice ( having O 15 mmt area for eacl]litre of water capacity oTthc cylinder ).

6.2.4 -Safe~ De:ires fur Use 1$ith Norr./iqueJeri Gas Presswc-Relitf J-OlPCSOrdy)The minimum required flow capacity of pressure-reIief valves forinstallation in non-insulated cylinders for non-liquefied gas shall be calcu-lated by the following formula:

Q. = 0082 P[f-C

whereQ== flow capacity in m3/h of free air,

P = flow rating pressure in kgf/cmz (absolute), and[V = Water capacity of she cylinder in litres, which in any case

shall not be taken as less than 5 litres.

6.2.5 Safety Deuicesfor Use wilh I.iquejied Gas ( Pressure-Relief Values Only ) The minimum required flow capacity of pressure-relief valves for installa-tion in non-insulated cylinders for liquefied gas shall be calculated by thefollowing Tormula

Q.a= 0164 PWCwhere

Q. == flow capacity in m8/h of free air,P = flow rating pressure in kgf/cm~ (absolute), and

Wc= water capacity of the cylinder in litres, which in any caseshall not be taken as less than 5 litres,

6.3 Piping for Safety Devices Where fittings and piping are used oneither the upstream or downstream side or both of a safety device ordevices the passages shall be so designed that the flow capacity of the

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IS I5903 - 1970

6.5.2 Individual Components of Bursting Disc Assemblies- When bursting discs and pressure opening parts are designed to be replaced as components, they shall be marked to indicate the rated bursting pressrlre (with the proper mating part), the flow capacity and the manufacturer.

NOTE - The following are suggested methods of marking: a) Stamp to identify the rated bursting pressure or identifying p?rt

number, on the part containing the pressure opening,

b) Ink, or otherwise mark, the number on the bursting disc, or apply other code mark, to facilitate determination of bursting pressure range and proper mating parts.

6.5.3 Fusible Plugs-Fusible plugs shall be externally marked (by coding if necessary) to indicate yield temperature rating and flow capacity.

6.5.4 Pressure-Relief Valves-Pressure-relief valves shall be marked by coding, if necessary, to indicate:

a) the set pressure for which the valve is set to start to release ;

b) the flow rating pressure in kgf/cms gauge at which the flow capacity of the valve is determined; and

c) the flow capacity in cubic metre per hour of free air.

6.5.5 Combination Safep Devices -When bursting discs and pressure opening parts are combined in factory assembled safety devices designed to be replaced as a unit, the assembly shall be externally marked to indicate pressure rating, flow capacity and yield temperature rating ( where applicable ).

NOTE - Examples of these are: a) Bursting disc assemblies ( BD ),

b) Combination bursting disc/fusible plug ( BD/FP, or BD/FP,), and

c) Combination pressure-relief valve/fusible plug ( PRV/FP, or PRV/FP, ).

7. ACCEPTANCE AND APPROVAL REQUlREMENTS

7.1 Gameral Requirementa

7.1.1 Ty#e Test - Only those safety devices which have complied with - the requirements of 7.1.2 and the requirements for the specific type of safety device shall be accepted as meeting the requirements. Such devices may then be identified by the relevant type designation specified in 3.1.

7.1.2 Flow Capacity Test ( For All Safe& Dovice~ )

7.1.2.1 General-The flow capacity of each design and modification thereof of all types of safety devices shall be determined by a competent authority by actual tlow test by an approved method and a copy ot results obtained. The form to be used for such submission shall he as given in Appendix A.

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IS : 5903 - 1970.

7.1.2.2 Number of samples for test-Three samples of each size of each! device representative of standard production shall be tested in accordance with 7.1.2.3 by a competent authority by an approved method.

7.1.2.3 Test procedure- Each sample device shall be tested as follows:

a) The device shall be completely assembled from the inlet of the approach channel to the exit of the discharge channel in the manner normally assembled for use.

b) Air orgas shall be supplied to the safety device through a supply pipe provided with a pressure gauge and a thermometer for indicating and recording ~the pressure and temperature of the supply. Observations shall be made and recorded after steady flow conditions have been established. Test conditions need not be the same as the conditions under which the device is expected to function in service, but the following limits shall be met. The inlet pressure of the air or gas supplied to the safety device shall be not less than 7 kgf/cm* ( absolute ) , except that the flow capacity of a pressure-relief valve shall be made at the flow rating pressure.

c) Each device shali be caused to operate by either pressure or by temperature or by a combination of such effects which shall not exceed the maximum temperature and pressure for which it was! designed.

d) After pressure testing and without cleaning, removal of parts, or ! reconditioning, each safety device shall be, subjected to an actual flow test wherein the amount of air or gas released by the device is meaiured.

e) Where fusible plugs are being flow capacity tested, the fusible alloy shall be removed from the orifice by heating the plug above the melting point of the fusible alloy.

7.1.2.4 Requirements - The average capacity of the three devices tested shall be recorded as the flow capacity. The design of the device shall be considered acceptable provided the q&ties of the three sample devices fall within 10 percent of the highest capacity recorded.

7.2 Specific Requirements for Barsting Discs

7.2.1 Number nf Samples for Test -From every production batch of completed discs of the same size and made from the same roll of foil, or

from every batch of disc hold&s as appropriate, the number of discs shown in Table I shall be selected at random for testing ( see also 7.2.4).

7.2.2 Bursting Test for Discs

7.2.2.1 Procedure -Each sample disc shall be mounted in a proper holder with a pressure opening having dimensions identical with that in the device in which it is to be used, and submitted to a bursting test

13

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SI

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S.Upp1OH .oJlsaJ Guysng gzL

OL61. - CO6S : SI

1s:5903.1970

b) A test sarnde shall consist of aDiece50m m]omrandof ammoxi-/

c)

d)

rnately 5 m-m diameter cut from ;ach stick. Eat% sample .&all besuspended horizontally on suitable supports spaced 25 mmripart andpresenting knife edges to the sample so that the ends of the samplewill overhang the knife edges 125 mm. The supported samplesshall be immersed in a glycerine bath not closer than 5 mm to thebottom of the container. This batch shall be. suspended in andcontrolled by an outer glycerine bath.

Two samples from the same stick shall be tested at one time. Athermometer (bulb immersion ) shall be inserted into the batchbetween and closely adjacent to the samples so that the bulb wilIbe completely immersed at the same level as the samples. Thebath temperature shall be raised at a rate not in excess of 3C/min.

The yieki temperature shall be taken as that temperature at whichthe -second of the four ends of the samples loses its rigidity anddrops.

I%OTE-- The test outlined above has been found to be a satisfactory laboratorycontrol test for determining the yie~d temperature of fusible alloys. Whlie this test isrecommended? equivalent tests usisig samples Of different dimensions and differentrates of heat me are permimibie provided that they yieid reproducible rests] ts.

793.2 Extrusion and yield Temperature Test of Fusible Plugs or ReinforcedFusibie P!ugs.

7.3.2.1 General Plugs selected in accordance with 7.3.2.2 shall beinstalled in a test rig which will simulate actual conditions of insta}lationin a cylinder, and tested in accordance with 7.3.2.3 and 7.3.2.4.

7.3.2.2 .Nurnber of samples for test From every production. batch ofcompleted fusible plugs of the same size, made from the same batch offusible alloy (see 7.3.1 ), the number of plugs shown in Table 2 shall beselected at random.

TABLE Z NUMBER OF PLUGS TO BE TESTED

NUMBER m I?ATCR NVStBER TO BE TEETEDMm

(1) (2)9 up to and including 8 29 >% S* s? *1 15 316,, ,, ,, 30 431,, ,, ,, ;; 100 6

101 ,, ,,. ,, ,, 250 8251 ,, ,, ,, ,, 1000 10

1001 ,, ,, ,, ,,10000 25

..

.)*. ,*.

16

IS : 5903 - 1970

7.3.2.3 Test to determine resistance to e.vtrusion -Each sample shall be subjected to a controlled temperature of not less than 55C for 24 hours with a gas pressure of 35 kgf/cm2 (gauge) on the end normally exposed to the contents of the cylinder. No leakage or visible extrusion of material shall be evident upon examination of the end exposed to atmospheric pressure.

7.3.2.4 Test for determination of the yield temperature of a fusible plug (see 3 )-Each sample shall be tested for determination of the yield temperature, as follows:

a)

b)

The samples shall be subjected to an air pressure of not less than 0.2 kgf/cma (gauge) applied to the end normally exposed to the contents of the cylinder. While subjected to this pressure the samples shall be immersed in a alycerine-water bath, at a temperature in the range of 3C immediately below the minimum yield temperature, and held in that temperature range for 10 minutes. The temperature of the bath shall then be raised at a rate not exceeding 3C/min during which the pressure may be increased to not more than 3.5 kgf/cm2 (gauge). When the temperature of the bath reaches the point where material is extruded sufficiently to produce leakage of air from all sample plugs the temperature of the bath should be recorded as the yield temperature of the plugs. It shall be within the temperature limits specified in 3 for that particular type of fusible plug.

As an alternative method, these plugs, after passing the test at a temperature in the range of 3C immediately below the minimum yield temperature, may at once be immersed in another bath held at a temperature not exceeding the maximum yield temperature specified in 3 for that particular type of fusible plug. If air leakage occurs from all sample plugs for 5 minutes at that temperature the requirements shall be considered to have been met.

NOTE 1 -Variation in temperature within the liquid bath in which the plug is immersed for either test(a) or (b) shall be kept to a minimum by stirring while making the tests.

NOTE 2-It is recommended that, for safety reasons, a restricting orifice be installed in the air supply line to restrict flow when conducting this test.

7.3.2.5 Rejection- If any of the samples fails to meet the requirements of 7.3.2.3 and 7.3.2.4, the entire batch of plugs.shall be rejected unless a retest is carried out in accordance with 7.3.2.6.

7.3.2.6 Retests - If the manufacturer so desires, he may subject double the original number of samples, selected at random from the same batch, to identical tests. If all of these additional plugs meet the requirements, the remaining plugs of the batch shall be acceptable; if any of the additional plugs fail the entire batch shall be rejected.

17

81

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OL61- CO6S : SI

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OL61- 606s : SI

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Title Page0. Foreword1. Scope2. Terminology3. Types and Safety Devices4. Information to be Specified by the Purchaser5. Field of Application6. Design and Construction7. Acceptance and Approval RequirementsTable 1Table 2

8. Periodic Inspection and MaintenanceAppendix A

T: ( Reaffirmed 2006 )

Documents

5903Recommendations for safety devices for gas cylinders.pdf