Walvis Bay GasPort® Design Basis Documents/Excelerat… · High Pressure Gas Loading Arm ... range 138,000 m3 to 173,400 m3. The LNGC will be moored alongside the FSRU with LNG transferred

Walvis Bay GasPort® Design Basis

Confidential Information

Document No.: WBGP-BOD-002

Submission Date: 29 August 2014

Annexure L7 Xaris

Page 1 of 24



Confidential & Non-Binding Page 2 of 24

Neither this report nor the materials submitted with it constitute an offer to provide any good or service, to enter into a contract to provide any good or service or a binding commitment, offer or indication of terms. The making of any such offer or the creation of any contractual or other obligation binding on Excelerate Energy Limited Partnership (“Excelerate”) shall be affected only through a definitive written agreement approved by the Supervisory Board of Excelerate.

Although Excelerate has made a reasonable effort to ensure the accuracy of information contained in this document, it makes no representation or warranty concerning the completeness, accuracy or timeliness of any such information. Any such representation or warranty would only be made by Excelerate in a definitive written agreement approved by the Supervisory Board of Excelerate. In addition, certain information contained in this report represent estimates, forecasts, projections, expectations, beliefs or similar expressions (collectively, “estimates”). These estimates are subject to known and unknown risks, uncertainties and other factors which could cause actual results, performance or achievements to differ from the estimates, Excelerate makes no representation or warranty concerning any such estimate.

Revision Date Description By Checked Approved 0 08/25/14 Initial draft GT RO KM 1 8/29/14 Gas Quality Network Entry Conditions GR RO KM

Annexure L7 Xaris

Page 2 of 24




Table of Contents 1 INTRODUCTION ..................................................................................................................................................... 4

2 GAS QUALITY, PRESSURE, TEMPERATURE AND FLOW .......................................................................................... 5

2.1 Gas Quality ................................................................................................................................................... 5

2.2 Temperature, Pressure and Flow ................................................................................................................. 6

3 TERMINAL LOCATION ............................................................................................................................................ 8

4 FLOATING STORAGE AND RE-GASIFICATION UNIT - FSRU ..................................................................................... 9

4.1 FSRU Re-gasification System ........................................................................................................................ 9

4.2 LNG Containment System & Working LNG Capacity .................................................................................. 10

4.3 LNG Transfer .............................................................................................................................................. 11

4.4 Vapor and Boil Off Gas Management. ....................................................................................................... 11

4.5 Monitoring, Operation and Control ........................................................................................................... 11

5 JETTY AND JETTY APPROACH FACILITIES ............................................................................................................. 12

5.1 Berthing System ......................................................................................................................................... 12

5.2 Mooring System ......................................................................................................................................... 12

5.3 Jetty Ship to Shore Link .............................................................................................................................. 12

5.4 FSRU Access Gangway ................................................................................................................................ 13

5.5 High Pressure Gas Loading Arm ................................................................................................................. 13

5.5.1 Arm Operation ....................................................................................................................................... 13

5.5.2 Loading Arm Connection and Emergency Release ................................................................................ 14

5.5.3 Loading Arm Monitoring ........................................................................................................................ 14

5.6 Class 900 Low Temperature Carbon Steel System ..................................................................................... 15

5.7 Blow Down System ..................................................................................................................................... 15

5.8 Jetty Control Room .................................................................................................................................... 16

5.8.1 Plant Control System ............................................................................................................................. 16

5.8.2 Emergency Shut Down System .............................................................................................................. 16

5.8.3 Fire and Gas Detection System .............................................................................................................. 16

5.8.4 Communications .................................................................................................................................... 16

5.9 Jetty Equipment Room ............................................................................................................................... 17

5.10 Jetty Low Voltage Switch room .................................................................................................................. 17

5.11 Fire Fighting and Deluge Equipment .......................................................................................................... 17

6 DESIGN CODES AND STANDARDS ........................................................................................................................ 18

Annexure L7 Xaris

Page 3 of 24




1 INTRODUCTION

The Terminal will be designed to permanently moor and re-supply a floating storage and re-gasification unit (FSRU) and to provide the necessary facilities for the offloading and transmission of re-gasified LNG (re-gas) to downstream gas users.

A floating storage and re-gasification unit (FSRU) with a nominal cargo capacity in the range 138,000 to 151,000 m3 will be berthed and moored at a new jetty on which will be located berthing and mooring facilities, a personnel gangway , a high pressure gas loading arm, emergency shutdown valves, associated re-gas pressure and temperature monitoring systems.

The FSRU will provide all the facilities and functions for the storage, re-gasification and metering, prior to discharge to the jetty facilities. Re-gas flow rates will be nominally 500 MMSCFD with the potential for peak flow rates up to 690 MMSCFD when the FSRU vaporization heating system is operated in open loop.

The FSRU will be re-supplied with LNG from conventional LNG carriers (LNGC) with nominal cargo capacities in the range 138,000 m3 to 173,400 m3. The LNGC will be moored alongside the FSRU with LNG transferred to the FSRU via cryogenic flexible hoses at flow rates up to 6,000 m3/h.

The composition of the LNG transferred will be controlled via the LNG Purchasing specification and by stock management during transit from the loading port to the re-gasification port such that the LNG will be fully cooled before transfer. All vapor displacement and boil off gas arising from the LNG transfer will be actively managed by the FSRU and LNGC operators. A necessary requirement will be that the LNGC operator will receive vapor from the FSRU and have the capability to manage the boil off gas using cargo tank ullage, gas burning and/or re-liquefaction.

High pressure (HP) low temperature carbon steel jetty approach pipe work will convey the re-gas from the jetty to the shore side ESD valve and manual isolation valve. The outlet of the manual isolation valve will define the battery limit of the Terminal and the entry to the downstream gas Network.

The re-gas pressure and temperature of the re-gas will be monitored at the jetty using two out of three (2oo3) logic controlled systems. An ESD valve will be provided to shut off the flow of gas if the pressure (or temperature) exceeds the design parameters of the jetty approach pipe work or the Network. A local equipment room and utility area will be provided on the jetty at a safe distance from the HP gas arm.

The design of the Network is the responsibility of others.

Annexure L7 Xaris

Page 4 of 24




2 GAS QUALITY, PRESSURE, TEMPERATURE AND FLOW

The design and operating philosophy of the GasPort and downstream facilities will take into account the requirements for quality, pressure and temperature of the gas to be delivered to the downstream gas network. These requirements influence the purchase specification for the LNG, the operation of the LNGC and FSRU and the design of the GasPort and downstream facilities and the most significant aspects of the process design are outlined below.

Gas Quality 2.1

The basis of design for the project is that LNG will be sourced from a location specified by the client. The LNG will typically have a range of parameters as shown in the table below.

Component Units Lean LNG Rich LNG

Methane mol% 96.09 89.75

Ethane 3.40 6.33

Propane 0.39 2.26

I-Butane 0.04 0.40

N-Butane 0.03 0.61

I-Pentane 0.00 0.02

N-Pentane 0.00 0.01

Hexane 0.04 0.00

Nitrogen 0.01 0.62

Carbon Dioxide 0.00 0.00

100.00 100.00

Molecular Weight kg/kmol 16.69 18.10

Table 1: Example LNG and Re-gas Composition and characteristics

This range of LNG components is within the re-gasification capability of the FSRU.

The range of LNGs and the required Network Entry Conditions will be confirmed prior to detailed design.

The gross calorific value and Wobbe number of the re-gasified LNG shall be within the range permitted by the client and as such, the LNG can be re-gasified and delivered to the battery limit without any modification to the gas composition i.e. nitrogen addition, LPG spiking or hydrocarbon removal is not required.

Prior to liquefaction, gas is pre-treated to remove components and impurities which would otherwise interfere with the liquefaction process. As such, the composition and characteristics of re-gasified LNG will normally meet Gas Network Entry Conditions for sulphur, hydrogen sulphide, carbon dioxide and water content without additional treatment at the Terminal.

Annexure L7 Xaris

Page 5 of 24




Gas Quality Network Entry Conditions – [To be confirmed]

Parameter

Unit of Measurement

Value

Limit Min Max

Gross Calorific Value MJ/m3 (*) 35 45

Wobbe Number MJ/m3 (*) 45 60

Inert Gases % v/v 0.5 - 0.2

Hydrocarbon Dew Point oC -5 - -15

Carbon dioxide % v/v 3 - <2

Oxygen % v/v 0.2 - <0.1

H2S mg/Nm3 0.5 - <0.4

Total Sulphur mg/Nm3 1 - <0.8

Water mg/Nm3 15 - <10

Note (*): The calculation of GHV and WI at MJ/m3 are according to ISO Standard 6976/95, (0o C, 1.01325 bara), metering reference condition and 15o C, 1.01325 bara, combustion reference conditions.

Table 2: Gas Quality Network Entry Conditions

Temperature, Pressure and Flow 2.2The FSRU vaporizer system is designed to operate between 75.0 and 104.0 barg. The actual operating pressure in the vaporizer will be determined by the physical design of the jetty and jetty approach, the composition of the LNG, the prevailing pressure in the Network and the re-gas flow rate.

The FSRU vaporizer system utilizes heating water to vaporize and pre-heat the LNG. The heating water system can be operated in one of three modes;

Open Loop – seawater is drawn in through the FSRUs sea chests and passes directly through the HP

Vaporizers before being discharged at a lower temperature overboard

Closed Loop - steam from the FSRU Main (and Auxiliary if fitted) Boilers is used to heat

fresh/seawater in the Water Heaters. This water is circulated in a closed loop through the HP

Vaporizers and returned to the Water Heaters. Steam condensate is returned to the boilers to

increase the thermal efficiency of the system

Combined – seawater is drawn in and discharged overboard as per Open Loop, but is further heated

prior to entering the HP Vaporizers as per Closed Loop

The operating mode is determined by the prevailing sea water temperature and commercial and environmental constraints or objectives.

Annexure L7 Xaris

Page 6 of 24




The physical design of the jetty and onshore high pressure gas systems and the pipe line to the delivery point must ensure that the upper operating pressure limit on the vaporizer is not exceeded at re-gas flow rates up to 500 MMSCFD and should not cause an excessive demand for gas heating and inefficient use of fuel gas.

Annexure L7 Xaris

Page 7 of 24




3 TERMINAL LOCATION

A concept study was previously carried out by Prestedge Retief Dresner Wijnberg (PRDW) to determine the optimum location and layout of the import facility. This study recommended that the facility be constructed along the ship channel that will be dredged as part of the proposed Walvis Bay SADC tanker berth project (Figure 1).

Figure 1: Overview of the preferred FSRU/LNGC berthing location

Annexure L7 Xaris

Page 8 of 24




4 FLOATING STORAGE AND RE-GASIFICATION UNIT - FSRU

Excelerate Energy will place either a 138,000 or 151,000 m3 re-gasification unit, into long term service for the project. The FSRU will have the following Classification:

Bureau Veritas (BV nb: 03161N) I + HULL + MACH, liquefied gas carrier / LNG-RV (membrane tank 0.25 bar, -163C, 500 kg/m3), Unrestricted navigation, + AUT-UMS, + SYS-NEQ-1, MON-SHAFT, + VeriSTAR-HULL 40 years, STL-SPM, IN WATER SURVEY.

The FSRU operator will conduct side-by-side (double-banked) ship-to-ship cargo transfer operations while connected and discharging to shore via an HP gas arm. LNG transfer and re-gasification operations will continue provided the met-ocean limiting conditions set by the Classification Society of the delivering LNGC are not exceeded.

Additional studies shall be necessary to confirm an individual LNGC meets the compatibility requirements of the FSRU in all regards. Availability of STS transfer operations at the proposed site is expected to meet the supply needs of the project with a high degree of reliability and safety.

FSRU Re-gasification System 4.1

The re-gasification system comprises a suction drum, HP pumps, HP vaporizers, metering system, low and high-pressure pipe work and valves. LNG is stored within the cargo tanks at a pressure slightly above atmospheric, and is pumped by the HP Feed Pumps to the Suction Drum. The Suction Drum serves as an accumulator and surge vessel for the main HP Pumps.

Figure 2: FSRU Re-gasification Process Schematic

From the suction drum, the liquid pressure to the vaporizers is increased by the HP Pumps. The re-gasification system includes two small high pressure pumps (SHP pumps) which are used for pressurization of the system during start up. Once a re-gasification flow rate of 10 MMSCFD has been achieved, the LNG vaporizer outlet control valves are set to control the vaporization outlet pressure to not less 75 barg.

HP FEED PUMP

SUCTIONDRUM

HP PUMP HP VAPORIZER

EXPORT METERING

HP GASMANIFOLD

STLTM

TURRETCARGO TANK WATER

HEATER

KEYLNGNATURAL GASHEATING WATER (OPEN LOOP)HEATING WATER (CLOSED LOOP)HEATING WATER (COMBINED LOOP)STEAM/CONDENSATE

OVERBOARD

SEA CHEST

SEA CHEST

Annexure L7 Xaris

Page 9 of 24




A single HP pump is utilized to increase the LNG flow rate to the minimum operating re-gasification flow rate of 50 MMSCFD. The re-gasification flow rate can then be increased up to 115 MMSCFD utilizing the same pump. Flow rates up to the contractual flow rate can be met by progressively starting additional vaporizer and HP pump streams. There are six HP pumps on an FSRU. Five pumps are utilized to deliver gas at a rate of 500 MMSCFD. Therefore, there is sufficient spare capacity on the FSRU to ensure high availability and reliability of the terminal. The sixth pump is used for peak capacity operation up to 690 MMSCFD.

The FSRU incorporates six LNG vaporizers. The normal re-gasification rate of a vaporizer is between 50 and 100 MMSCFD with a maximum flow rate of 115 MMSCFD. Flow rates up to the contractual flow rate can be achieved by progressively starting additional vaporizers and HP Pump streams.

The vaporizer is a shell-and-tube heat exchanger where the LNG is vaporized to natural gas via indirect heating with warm or hot water to achieve the required gas outlet temperature.

On leaving the LNG Vaporizer, natural gas flows through the metering station and on to a pressure control valve that maintains a minimum backpressure of 75 barg in the re-gasification system and to the high pressure manifold for discharge to the shore side.

The high pressure gas system is protected by means of high pressure trips, low temperature trips, and relief valves. The FSRU Emergency Shut Down (ESD) system will activate to shut down the re-gasification process in the event that a ship or shore side ESD condition is present. The FSRU’s Integrated Automated System (IAS) ensures the safe operation of the re-gasification plant within the system design parameters and is used to control the required discharge flow rate.

Additional discharge pressure and discharge temperature overrides are provided within the IAS.

LNG Containment System & Working LNG Capacity 4.2

The cargo containment technology for the FSRU is the Gaz Transport Technigaz (GTT) № 96 strengthened membrane system as fitted to most membrane-type LNGCs. This system comprises multi-layered reinforced tanks - as shown in Figure 3 - that allow unrestricted liquid levels at North Atlantic sea conditions.

Figure 3 - GTT № 96 containment system construction details

Annexure L7 Xaris

Page 10 of 24




The system incorporates primary and secondary membrane barriers to ensure cargo integrity in the event of leakage of the primary barrier. Both barriers are identical, and constructed of a 0.7 mm thick invar skin backed with a layer of perlite-filled plywood boxes that provide both structural support and insulation. Invar is a 36% nickel stainless steel alloy, and is selected as it has a negligible coefficient of thermal expansion.

The “working” storage volume of an FSRU is 98.5% of the total physical cargo tank volume.

LNG Transfer 4.3

To facilitate LNG transfer between the LNG Carrier (LNGC) and the FSRU the LNGC will be moored alongside the FSRU in a “double banking” arrangement to enable a direct Ship to Ship Transfer (STS) of LNG.

The STS transfer system utilizes flexible cryogenic hoses to resupply the FSRU from a conventional LNGC. Six (6) liquid hoses, and two (2) vapor hoses are connected between the FSRU and the LNGC. The liquid hoses are each capable of transferring up to 1,000 m3/h, giving a maximum LNG loading rate of 6,000 m³/h. This rate has proven to be the most optimal rate while maintaining a safety margin to manage tank pressures and management of the BOG generated.

The LNGC cargo transfer pumps will be utilized in the transfer of liquid to the FSRU.

Actual transfer rates will be determined by the requirement to manage the vapor displaced during the transfer process and the boil off gas generated by the transfer of LNG, the re-gasification processes and heat absorbed from the atmosphere into the cargo.

Vapor and Boil Off Gas Management. 4.4

The vapor and boil off gas will be managed within the operating limits specified for the LNGC and FSRU cargo tanks and no other boil off gas management facilities will be provided at the GasPort.

It is expected that the LNGC operator and the FSRU operator will co-operate to manage the vapor and boil off gas. Vapor displaced by the loading of the FSRU cargo tanks will be returned to the LNGC to counter the “piston effect” caused by the LNG transfer.

Some boil off gas will be used for electrical power generation and ship services and any surplus vapor burnt in the FSRU or FSRU and LNGC boilers. Steam surplus to the requirements for heating and ship board power generation will be rejected to atmosphere via steam “dump” valves.

BOG is consumed in the boilers to power the re-gasification plant and the vessel. If the vessel is sitting idle, the ship will consume only the natural BOG of no more than 0.155% of cargo tank volume per day. At maximum base load send-out of 500 MMSCFD the power required exceeds the power generated through natural BOG with the balance of fuel made-up using a forcing vaporizer. However, this does not mean that at all times during the operation of the FSRU, that BOG will only be 0.155% because during the STS Transfer operation the BOG rate will increase and vary significantly over a given cargo based on the saturation vapor pressure and liquid temperature of the cargo transferred, the environmental conditions and rate of transfer.

Monitoring, Operation and Control 4.5

The FSRU cargo control room is continuously manned. The monitoring, operation and control of cargo transfers, boil off management and re-gasification systems are facilitated by the vessel’s IAS.

Annexure L7 Xaris

Page 11 of 24




5 JETTY AND JETTY APPROACH FACILITIES

The jetty facilities will be designed to facilitate the safe berthing and mooring of the FSRU and the LNGC and to receive re-gas from the FSRU. The jetty approach facilities will be designed to convey the gas to the onshore gas delivery point.

Berthing System 5.1

The Berthing Management System (BMS) will provide the facilities for the vessel to dock, and will include functions for met-ocean monitoring and mooring hook load monitoring.

The BMS will be equipped with a central computer system that allows the operator to monitor and supervise critical docking characteristics of its berth, including hook load, ship approach and met-ocean data and will interface with the Ship to Shore Link (SSL) system to repeat hook load and met-ocean data to the ship while the vessel is docked.

Mooring System 5.2

The jetty will be provided with quick release mooring hooks. The number and location of the mooring hooks (including load pins) size, type and quantity for each of the vessels will be specified as per the project mooring study.

Each hook assembly will be fitted with a capstan and local motor control panel.

These hooks will have the following capabilities; Local electrical release – Each hook will have the capability to be released locally from a local electric

release system.

Remote Release panel - A dedicated remote release panel for each vessel will be included as part of

the (BMS), to allow for remote operational and emergency hook release applications. Location of the

remote release panel will be determined during detailed design.

Manual release – In event of loss of the electricity supply to the mooring hooks, each hook will be

capable of being released manually.

Fenders and quick release hook load capacities will be determined in detail design when all loads have been assessed.

Jetty Ship to Shore Link 5.3

A Ship to Shore Link (SSL) will provide the communications, data transfer and emergency shutdown signals exchange between the FSRU and the Shore side ESD system.

The link is a standard design used to interface with all LNG carriers and is fully compatible with the FSRU. The link will consist of a single fibre optic cable, stored on a mounted reel, connected back to a 19” rack panel in the Local Equipment Room (LER). This panel allows connection for;

Ship to Shore ESD signal

Annexure L7 Xaris

Page 12 of 24




Shore to Ship ESD signal

Hot line telephones located at the Local Equipment Room and Control Room. The hot phone provides

direct communication from shore, between the first phone to be picked up and the Cargo Control

Room or Wheelhouse and from the FSRU to the first phone to be answered on shore.

PSTN telephone line

PABX telephone line to the JCR

Marine Load monitor communications link.

Data transfer

Status alarms will be transmitted to the GasPort PCS for system fault and abnormal ESD.

FSRU Access Gangway 5.4

A hydraulically operated variable, geometry access gangway will provide for access and egress for personnel between the FSRU and the Jetty.

High Pressure Gas Loading Arm 5.5

The HP gas loading arm will be mounted at the FSRU berth and will be used to convey high pressure re-gasified LNG (Re-gas) from the delivery flange on the FSRU high pressure manifold to the jetty gas delivery point.

Incorporated into the arm is a quick connect /emergency disconnect system and an inlet ESD valve and an emergency disconnect ESD vent valve.

The DN 300 (12” NB) class 900 loading arm has been designed by Emco Wheaton to the Oil Companies International Marine Forum (OCIMF) Design and Construction Specification for Marine Loading Arms (Third Edition -1999). The specification covers the minimum requirements for marine loading arms and their ancillary equipment for loading and/or unloading ships and barges at conventional marine terminals and Sea Islands.

The design of the arm will accommodate the range of movements that are expected when the arm is connected to the FSRU under high and low water conditions and in the loaded cargo and ballasted states. The design and operating parameters are shown in Table 3:

High Pressure Gas Loading Arm Design and Operating Parameters Units Limits

Design Pressure barg 134.0

Design Temperature °C - 20.0 to + 80.0

Hydraulic Test Pressure barg 201.0

Pneumatic Test Pressure barg 134.0

Table 3: High Pressure Gas Loading Arm Design Parameters 5.5.1 Arm Operation

The arm will be securely parked when not in use.

Annexure L7 Xaris

Page 13 of 24




The operator has three (3) means of operating the loading arm: From the loading arm local control panel, suitable for use in a Zone 1 hazardous area

From a pedant control panel, suitable for use in a Zone 1 hazardous area

From a radio/wireless control, suitable for use in a Zone 1 hazardous area

The motive power to enable the operator to move, connect or disconnect the loading arm is provided by a hydraulic power system /control panel, which is suitable for use in a Zone 1 hazardous area and is located at grade below the operating platform.

The hydraulic system design takes into account: Wind load during operation and maneuvering of unit

Swivel friction torque

A rate of motion at the outboard swivel of 150 mm per second minimum and the resulting

acceleration loads

Free wheel conditions. When connected to the FSRU (or when securely parked) the hydraulic system

is in freewheel and will remain in "freewheel" in the event of electrical or hydraulic failure.

Lock up conditions. Pressure relief valves in the hydraulic system ensure that a system malfunction will not cause excessive hydraulic pressures or a complete hydraulic lock.

5.5.2 Loading Arm Connection and Emergency Release

Connection to the FSRU is made by a quick connect/quick disconnect and emergency release system (QC/DC-ERS). The QC/DC-ERS provides a means of connecting the arm with the FSRU, making a normal disconnection or in the event of the vessel/arm moving outside of the specified operating parameters, or manually initiated emergency disconnection.

The QC/DC-ERS comprises a failsafe hydraulically actuated locking device fitted at the outboard arm connection flange. If electric or hydraulic power fails, when the connection flange is made, the QC/DC-ERS coupling remains connected, unless an emergency disconnection is independently initiated.

5.5.3 Loading Arm Monitoring

During arm travel, or when connected to the FSRU, the operating envelope of the arm is monitored by potentiometers and the arm position can be viewed and tracked via a monitoring system located in the Gasport Control room. Independent proximity switches are used to monitor the position of the arm against pre-defined operating limits and will initiate sequential safety actions in the event that the position of the arm exceeds the operating limits.

At the first stage limit, a continuous audio-visual alarm is initiated.

At the second stage limit an ESD1 is initiated which results in:

Intermittent -visual alarm is initiated

Annexure L7 Xaris

Page 14 of 24




The loading arm inlet valve is closed and the pressure in the QC/DC-ERS is vented to the vent

stack.

An ESD interlocked signal is transmitted to the FSRU Safety Shutdown System and ESDV5 or

ESDV6, located on the FSRU adjacent to the loading arm connection flange, is closed.

At the third stage limit, an emergency disconnection is initiated via then opening of the

QC/DC/emergency Release Coupling.

The emergency disconnection can also be manually initiated through key locked push buttons on the loading arm control panel, or from head of FSRU gangway or from a Push button in the control room.

Class 900 Low Temperature Carbon Steel System 5.6

A class 900 low temperature carbon steel system will commence immediately downstream of the HP Arm and will convey re-gas to the Terminal battery limited located at the shore line.

The class 900 pipe work at the jetty head will incorporate a non-return valve, one (1) ESD valve, one (1) isolation valve, pressure and temperature transmitters, which will comprise part of the ESD system for the protection of the class 900 pipe work and the downstream class 600 carbon steel systems.

The class 900 pipe work at the battery limit will incorporate a non-return valve, one (1) ESD valves, and one (1) isolation valve.

The purpose of the class 900 system is to provide process isolation for gas operations and to shut off the flow of gas into the class 600 system and the downstream class 600 carbon steel system in the event that gas operating conditions exceed the design parameters of either system or if another ESD event occurs.

In the event that the pressure of the gas exceeds the design limits of the class 600 pipe lines or the downstream gas network then the flow of gas into the onshore facilities will be shut off and an ESD initiated on the FSRU.

In the event that the gas pressure falls to a level, at which it is deemed a major failure has occurred then the flow of gas into the facilities will be shut off, an ESD initiated on the FSRU and the delivery point ESD valve closed.

In the event that the temperature of the re-gas exceeds the design limits of the downstream class 900 and/or the class 600 carbon steel systems then the flow of gas into the facilities will be shut off and an ESD initiated on the FSRU.

The non-return valves will provide additional protection against the reserve flow of gas in the event that the loading arm disconnects from the FSRU.

The pipe work will be designed to ASME B31.3 Process Piping and the design parameters pressure will be compatible with the design parameters of the FSRU re-gasification system.

Blow Down System 5.7

An emergency blow down system will be designed and provided to manage the venting of the high pressure loading arm QC/DC-ERS and concurrent blow down of the HP loading arm. The blow down system will also accommodate the depressurization of the class 900 pipe work from the jetty head to ESD valve.

Annexure L7 Xaris

Page 15 of 24




Jetty Control Room 5.8

A climate controlled GasPort Control Room (GCR) will be provided to house operator work stations, proprietary equipment panels associated with vendor equipment, the Plant Control System (PCS) , emergency shutdown panel, fire and gas detection panel and communications cabinet.

The GCR and associated electronic systems will be designed and packaged in the UK, and all the systems will be integrated and tested prior to site delivery. This approach has been proven to significantly reduce the site installation, testing and commissioning time. The equipment room will normally be unmanned but local workstations will be provided for the PCS to facilitate operation, fault finding and maintenance activities when required.

5.8.1 Plant Control System

The PCS will provide all operator remote controls, graphic displays and diagnostics.

5.8.2 Emergency Shut Down System

The emergency Shut Down (ESD) system will monitor all safety measurement instrumentation and push buttons and ensure the correct actions (as per the project cause and effect diagram) are taken should an ESD condition occur. The system will be designed and built based on the requirements of IEC61508/11 to safety integrity level 2. The system design will be refined following a specific Layer of Protection Analysis (LOPA) study. Associated SIL calculations will be carried out to demonstrate the systems reliability and availability meet the requirements defined during the risk assessment.

A Cause & Effect Matrix will be developed prior to a Hazard and Operability Study (HAZOP) during the detail design.

The system will be pre-tested prior to shipment during the integrated acceptance test (IAT).

5.8.3 Fire and Gas Detection System

The jetty and battery limit will include a fire and gas detection system. The system design will be developed during detailed design following a specific fire risk analysis process.

5.8.4 Communications

Sufficient communications system shall be provided that allow for communications between, the FSRU (via SSL), jetty approach facilities and onshore equipment.

The communications design is based on a Dual redundant Fiber Optic Link to connect all Local Equipment Rooms (LERs) and the GasPort Control Room (GCR).

A dedicated LAN will be provided for each of the following systems: PCS – See further details in subsequent sections

ESD – See further details in subsequent sections

HP Loading arm Berthing

CCTV

Annexure L7 Xaris

Page 16 of 24




Security

IT & Telephones

Any local control systems – Switchgear, F&G, N2 generation controls etc, will be connected to PCS in that area.

Jetty Equipment Room 5.9

A climate controlled equipment room will be provided to house proprietary equipment panels associated with equipment located on the jetty. The equipment room will also house local Plant Control System (PCS) workstation , emergency shutdown panel, fire and gas detection panel and communications cabinet.

The local equipment room and associated electronic systems will be designed and packaged in the UK, and all the systems will be integrated and tested prior to site delivery. This approach has been proven to significantly reduce the site installation, testing and commissioning time.

The equipment room will normally be unmanned but local workstations will be provided for the PCS to facilitate operation, fault finding and maintenance activities when required.

Jetty Low Voltage Switch room 5.10

A climate controlled low voltage switch room will be provided to house the switch gear. Local electrical standards shall be confirmed during at the detail design stage of project.

An Uninterruptible Power Supply will be provided for 30 minute back up of critical systems to allow for time for the standby generators to start and /or safe shutdown.

Fire Fighting and Deluge Equipment 5.11

Subject to a HAZID/HAZOP assessment and local requirements, a water curtain system will be provided in the gangway access/egress areas to assist the safe escape of personnel in the event of a fire.

The provisional system design is a. Fire Fighting Pump set including Electric driven water Pump, Diesel driven water pump and Jockey pump.

b. Fire water main along the Jetty Approach.

c. Spray curtain and fire water hydrants.

d. Fire gas detector and heat detector at the HP loading arm.

To aid the fighting of small local fires (for example lube oil / diesel), the jetty will have the provision of wheeled dry chemical and/or AFFF extinguishers.

Annexure L7 Xaris

Page 17 of 24




6 DESIGN CODES AND STANDARDS

All elements of the GasPort facility will be designed and constructed in accordance with international codes and standards typically used in the oil, gas and petrochemical industries. Examples of the appropriate codes and standards are listed below:

AGA - American Gas Association

AGA Report 5 Natural Gas Energy Measurement

AGA Report 8 Compressibility factors of Natural Gas and Other Related Hydrocarbon Gases

AGA Report 9 Measurement of Gas by Multipath Ultrasonic Meters

AGA Report 10 Speed of sound in natural gas & other related hydrocarbon gases

ASME - American Society of Mechanical Engineers

ASME B31.3 Process Piping

ASME B31.8 Gas transmission and distribution piping systems

ASME Boiler and Pressure Vessel Code

ASME PTC 1 General Instruction performance Test Codes

ASME B31.5 – Refrigeration Piping and Heat Transfer Components

MSS – Manufacturers Standardisation Society

MSS – SP44 Steel Pipeline Flanges

MSS – SP75 Specification for High Test Wrought Butt Welding Fittings

ANSI - American National Standards International

ANSI B16.5 Pipe Flanges and Flanged Fittings

ANSI B16.9 Factory-Made Wrought-Steel Butt-Welding Fittings

ANSI B16.10 Face-to-Face and End-to-End Dimensions of Ferrous Valves

ANSI B16.11 Forged Steel Fittings, Socket-Welding and Threaded

ANSI B16.20 Metallic Gaskets for Pipe Flanges, Ring Joint, Spiral Wound and Jacketed

ANSI B16.21 Non Metallic Gaskets for Pipe Flanges

ANSI B16.34 Steel Valves, Flanged and Butt-Welding End

API - American Petroleum Institute

API 1104 Welding of pipeline and related facilities.

API 5L Specification for Line Pipe

Annexure L7 Xaris

Page 18 of 24




API 6D Pipeline Valves

API 6FA Fire Test Valves

API 598 Valve Inspection and Test

API 599 Metal Plug Valves -Flanged, Threaded and Welding Ends

API 601 Metallic Gaskets for Raised-Face Pipe Flanges and Flanged Connections (Double-Jacketed Corrugated and Spiral-Wound)

API 607 Fire Test for Soft-seated Quarter Turn Valves

API RP 500 Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Division 1 and Division 2

API RP 520 Part-1 Recommended Practice for Design and Installation of Pressure- Relieving Systems in Refineries, Part 1 - Design

API RP 520 Part-2 Recommended Practice for Design and Installation of Pressure- Relieving Systems in Refineries, Part 2 - Design

API RP 521 Guide Systems for Pressure-Relieving and Depressurizing

API RP-2003 Protection Against Ignitions Arising Out of Static, Lightning and Stray Currents

API PUB2030 Guide for Application of Water Spray Systems for Fire

Protection in the Petroleum Industry

API 14.1 Collecting and handling of natural gas samples for custody transfer

ASCE - American Society of Civil Engineers

ASCE 7-10 Minimum Design Loads for Buildings and Other Structures

ASTM - American Society for Testing and Materials

ASTM A 53Pipe, Steel, Black and Hot-Dipped, Zinc-Coated Welded and Seamless

ASTM A 105 Forgings, Carbon Steel, for Piping Components

ASTM A 106 Seamless Carbon Steel Pipe for High-Temperature Service

ASTM A 234 Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and Elevated Temperatures

ASTM A-386 Zinc Coating (Hotdip) / Assembled Steel Products

ASTM A 123 Specification for Zinc Coatings

ASTM A525 General Requirements for Steel Sheet, Zinc-Coated (Galvanized) by the Hot-Dip Process

ASTM D5454 Standard Test Method for Water Vapor Content of Gaseous Fuels Using Electronic Moisture Analyzers

ASTM D4178 Standard Practice for Calibrating Moisture Analyzers

ASTM A333 – Standards Specification for Seamless and Welded Steel Pipe for Low – Temperature Services

ASTM A269 - Standards Specification for Seamless and Welded Austenitic Stainless Steel Tubing for General Service

Annexure L7 Xaris

Page 19 of 24




ASTM D 1945 - Standard Test Method for Analysis of Natural Gas by Gas Chromatography

ASTM D 3588-98 – Standard Practice for Calculation Heat Value, Compressibility Factor and Gaseous Fuels by Chromatography and Chemiluminescence`s

ASTM D 5504 – Standard Test Method for Water Vapor Content of Gaseous Fuel Using Electronic Moisture Analysers

BSI - British Standards Institution

BS 4360 Specifications for weldable structural steels

BS 5950 Steel design

BS 6349 (Parts 1 to 7) Design of Marine Structures

BS EN 62305 Code of practice for protection of structures against lightning

BS EN ISO 28460:2010 Petroleum and natural gas industries. Installation and equipment for liquefied natural gas. Ship-to-shore interface and port operations

BS 6739:2009 Code of practice for instrumentation in process control systems: installation design and practice

BS 7671:2008+A1:2011 Requirements for electrical installations. IET Wiring Regulations. Seventeenth edition

BS 5839-9:2011 Fire detection and fire alarm systems for buildings. Code of practice for the design, installation, commissioning and maintenance of emergency voice communication systems

BS EN ISO 19901-1:2005 Petroleum and natural gas industries — Specific requirements for offshore structures — Metocean design and operating considerations

BS EN 1160 Installation and equipment for liquefied natural gas – General Characteristics of liquefied natural gas

BS EN 1473 Installation and Equipment for liquefied natural gas – Design of onshore installations

BS EN 1474 Installation and equipment for liquefied natural gas – Design and testing of loading/unloading arms

EN 12838 – Installations and equipment for liquefied natural gas – Suitability testing of LNG sampling system

DNV Offshore Codes and Recommended Practices

DNV OS – F101 Submarine Pipeline Systems

GPA - Gas Processors Association

GPA 2145-09 Table of Physical Properties for Hydrocarbons and Other Compounds of Interest to the Natural Gas Industry

GPA 2172-09 Calculation of Gross Heating Value, Relative Density and Compressibility Factor for Natural Gas Mixtures from Compositional Analysis

ICS - International Chamber of Shipping

Tanker Safety Guide – (Liquefied Gas)

Annexure L7 Xaris

Page 20 of 24




Ship to Ship Transfer Guide (Liquefied Gas) by ICS/OCIMF

IEC - International Electro Technical Commission

IEC 60034 Rotating Electrical Machines

IEC 60072 Dimensions and Output Ratings for Rotating Electrical Machines

IEC 60079 Electrical Apparatus for Explosive Gas atmospheres

IEC 60529 Degrees of Protection Provided by Enclosures (IP Code).

IEC 60534-1 Control valve Terminology and General Considerations.

IEC 60534-2-1 Flow Capacity – Section One: Sizing equations

IEC 60534-2-3 Flow Capacity – Section Three: Test Procedures.

IEC 60534-4 Inspection and Routine testing.

IEC 60534-8-3 Noise considerations-control valve aerodynamic noise prediction method.

IEC 60534-8-4 Noise considerations – prediction of noise generated by hydrodynamic flow.

IEC 61000 Electromagnetic Compatibility IEC 61131 Standard for Programmable Controllers

IEC 61508 Functional Safety of Electrical/electronic/programmable Electronic Safety –Related System.

IEC 61511 Functional Safety. Safety Instrumented systems for the process Industry sector.

IEC 61131 – Programmable Controllers

IEC 62040 – Uninterruptible Power Systems

IGC- International Gas Code

IMO International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (IGC Code)

ISA - International Society of Automation

ISA 75.01.01 Flow Equations for sizing Control Valves.

ISA 75.08.01 Face to Face Dimensions for Flanged Globe Style Control

Valve Bodies (Classes 125, 150, 250, 300 & 600).

ISA 75.08.06 Face to Face Dimensions for Flanged Globe Style Control

Valve Bodies (Classes 900, 1500 & 2500).

ISA 5.1 – Instrumentation Symbols and Identification

ISA 5.2 – Binary Logic Diagram for Process

ISA S20 – Specification Forms for Process Management and Control Instruments, Primary Elements and Control Valve

Annexure L7 Xaris

Page 21 of 24




ISGOTT - International Safety Guide for Oil Tankers and Terminals

ISO - International Standards Association

ISO 31 Quantities and Units

ISO 1000 SI units and recommendations for the use of their multiples and of certain other units.

ISO 1461 Hot dip galvanized coatings on fabricated iron and steel articles - specifications and test methods.

ISO 5167-Pt1-4 Measurement of fluid flow by means of pressure differential.

ISO TR 5168 Measurement of fluid flow – evaluation of uncertainties.

ISO 5208 Industrial Valves – Pressure Testing for Valves.

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

ISO 8501-1 Preparation of steel substrates before application of paints and related products-Visual assessment of surface cleanliness +Suppl.1.

Pt.1: Specification for rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coatings.

ISO 8528 Reciprocating Internal Combustion Engine Driven Alternating Current Generating Sets

ISO 9000 Quality Management Systems-Fundamentals and Vocabulary.

ISO 9001 Quality management systems – Requirements.

ISO 10440-2 Packaged air compressors (oil-free).

ISO 10497 Testing of Valves: Fire Type-Testing requirements.

ISO 14001 Environmental Management Systems.

ISO 15589 Cathodic Protection of Pipeline Transportation Systems

ISO 15761 Steel gate, globe and check valves for sizes DN 100 and smaller, for the Petroleum and Natural Gas Industries

ISO 6141 Gas analysis – Requirements for certificates for calibration gases and gas mixtures

ISO 6142 – Gas analysis – Preparation of calibration gas mixtures – Gravimetric method

ISO 6143 gas analysis – Determination of composition of calibration gas mixtures – Comparison methods

ISO 6326 – Natural Gas – Determination of Sulphur Compounds. Parts 1, 3 & 5

ISO 6568 – Natural Gas – Simple analysis by gas chromatography

ISO 6974 – Natural Gas – Determination of Composition with defined uncertainty by gas chromatography, Part 1 to 6

ISO 6976 – Natural Gas – Calculation of Calorific Values, Density and Relative Density and Wobbe Index from Composition.

ISO 10715 – Natural Gas – Sampling Guidelines

ISO 13275 - Natural Gas – Preparation of calibration gas mixtures – Gravimetric methods

ISO 13686 – Natural Gas Quality Designation

Annexure L7 Xaris

Page 22 of 24




ISO 19739 – Natural Gas Determination of Sulphur Compounds using gas chromatography

IEEE – Institute of Electrical and Electronics Engineers

IEEE-80 – Guide for Safety in AC Substations Grounding

IEEE-142 – Recommended Practice of Industrial and Commercial Power Systems

IEEE-518 – Guide for the Installation of Electrical Equipment to minimize the Electrical Noise Inputs to Controllers from External Sources

NACE - National Association of Corrosion Engineers

NACE RP 0169 Standard Recommended Practice Control of External Corrosion on Underground or Submerged Metallic Piping Systems

NACE RPO274 High Voltage Electrical Inspection of Pipeline Coating Prior to

Installation

NACE RP0169 Control of External Corrosion of Underground or Submerged

Metallic Piping System

NACE RP0177 Mitigation of Alternating Current and Lighting Effects on Metallic

Structures and Corrosion Control Systems

NFPA - National Fire Protection Association

NFPA 20 Standard for the Installation of Stationary Pumps for Fire Protection

NFPA 37 Installation and Use of Stationary Combustion Engines and Gas Engine

NFPA 59A Production, Storage and Handling of LNG

NFPA 11/11A Standard for Low/Medium and High Expansion Foam Systems

NFPA 12 – Standards on Carbon Dioxide Extinguishing Systems

OCIMF - Oil Companies International Marine Forum

Safety Guide for Terminals Handling Ships Carrying Liquefied Gases in Bulk

Design and Construction Specification for Marine Loading Arms

A Guide to Contingency Planning for Marine Terminals Handling Liquefied Gases in Bulk

A Guide to Contingency Planning for the Gas Carrier Alongside and Within Port Limits

Guide on Marine Terminal Fire Protection and Emergency Evacuation

SIGTTO - Society of International Gas Tanker and Terminal Operators

Guidelines for Ship to Shore Access for Gas Carriers

Annexure L7 Xaris

Page 23 of 24




Accident Protection – The Use of Hoses and Hard Arms at Marine Terminals Handling Liquefied Gas

Liquefied Gas Handling Principles on Ships and Terminals

Guidelines for Hazard Analysis as an Aid to Management of Safe Operations

Ship Information Questionnaire for Gas Carriers

Ship/Shore Questionnaire for Compatibility Study of Liquefied Gas Ships with Loading/Unloading Jetties

A Guide to Contingency Planning for Marine Terminals Handling

Liquefied Gases in Bulk

A Guide to Contingency Planning for the Gas Carrier Alongside and within Port Limits

LNG Operations in Port Areas: Essential Best Practices for the Industry

Site Selection and Design for LNG Ports and Jetties, Information Paper No.14

Annexure L7 Xaris

Page 24 of 24