iso-dis_16924.pdf
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© ISO 2013
Natural gas fuelling stations — LNG stations for fuellingvehicles
Stations-service de gaz naturel — Stations de GNL de ravitaillement des véhicules
Reference numberISO/DIS 16924:2013(E)
DRAFT INTERNATIONAL STANDARD
ISO/DIS 16924
THIS DOCUMENT IS A DRAFT CIRCULATEDFOR COMMENT AND APPROVAL. IT ISTHEREFORE SUBJECT TO CHANGE AND MAYNOT BE REFERRED TO AS AN INTERNATIONALSTANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION ASBEING ACCEPTABLE FOR INDUSTRIAL,TECHNOLOGICAL, COMMERCIAL ANDUSER PURPOSES, DRAFT INTERNATIONALSTANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIRPOTENTIAL TO BECOME STANDARDS TOWHICH REFERENCE MAY BE MADE INNATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITEDTO SUBMIT, WITH THEIR COMMENTS,NOTIFICATION OF ANY RELEVANT PATENTRIGHTS OF WHICH THEY A RE AWARE AND TOPROVIDE SUPPORTING DOCUMENTATION.
ISO/PC 252 Secretariat: NEN
Voting begins on: Voting terminates on:2013-12-24 2014-03-24
ICS: 75.200
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ISO/DIS 16924:2013(E)
ii © ISO 2013 – All rights reserved
Copyright notice
This ISO document is a Draft International Standard and is copyright-protected by ISO. Except aspermitted under the applicable laws of the user’s country, neither this ISO draft nor any extractfrom it may be reproduced, stored in a retrieval system or transmitted in any form or by any means,electronic, photocopying, recording or otherwise, without prior written permission being secured.
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ISO/DIS 16924
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Contents Page
Foreword .......................................................................................................................................................... viii
1 Scope ...................................................................................................................................................... 1
2 Normative references ............................................................................................................................ 1
3 Terms and definitions ........................................................................................................................... 2
4 Abbreviated terms ................................................................................................................................. 8
5 General principles of design and installation..................................................................................... 8
5.1 General ................................................................................................................................................... 8
5.2 Functional requirements ....................................................................................................................... 9
5.2.1 Gas composition ................................................................................................................................... 9 5.2.2 LNG supplied to the fuelling station .................................................................................................... 9
5.2.3 LNG supplied to the vehicle ............................................................................................................... 10
5.2.4 Fuelling pressure and temperature of CNG ...................................................................................... 10
5.3 Environmental impact ......................................................................................................................... 10
5.3.1 Methane emissions ............................................................................................................................. 10
5.3.2 Noise attenuation ................................................................................................................................ 10
5.4 General design requirements ............................................................................................................. 11
5.4.1 Materials ............................................................................................................................................... 11
5.4.2 Prerequisites for various elements of assembly ............................................................................. 11
5.5 Site and lay-out .................................................................................................................................... 11
5.5.1 General provisions .............................................................................................................................. 11
5.5.2 Location of LNG containing equipment ............................................................................................ 11
5.5.3 Working area ........................................................................................................................................ 11 5.5.4 Requirements for location of components ....................................................................................... 12
5.5.5 Traffic management ............................................................................................................................ 12
5.5.6 Separation distances .......................................................................................................................... 12
5.5.7 Security................................................................................................................................................. 14
5.5.8 Buildings and civil works ................................................................................................................... 14
5.5.9 Enclosures and canopies ................................................................................................................... 14
5.5.10 Specific requirements on CNG part of station ................................................................................. 14
5.5.11 Station signs, equipment and pipeline identification ...................................................................... 15
5.6 Risk management ................................................................................................................................ 17
5.6.1 General ................................................................................................................................................. 17
5.6.2 Risk assessment ................................................................................................................................. 17
5.7 Protection against overpressure ....................................................................................................... 17
5.7.1 Safety devices ...................................................................................................................................... 17 5.7.2 Auxiliary safety devices ...................................................................................................................... 17
5.7.3 Maximum allowed fuelling pressure of LNG..................................................................................... 18
5.7.4 Maximum allowed fuelling pressure of CNG .................................................................................... 18
5.7.5 Prevention of excess pressure from the pump ................................................................................ 18
5.8 Prevention of LNG spills ..................................................................................................................... 18
5.8.1 Isolation ................................................................................................................................................ 18
5.8.2 Containment areas .............................................................................................................................. 19
5.9 Prevention of venting of natural gas ................................................................................................. 20
5.10 Prevention of fire and explosion ........................................................................................................ 20
5.10.1 Explosion protection measures ......................................................................................................... 20
5.10.2 Hazardous area classification ............................................................................................................ 21
5.10.3 Prevention of other sources of ignition ............................................................................................ 21
5.10.4 Detection of emergency situation ...................................................................................................... 21
5.10.5 Fire protection ..................................................................................................................................... 22
5.11 Static electricity ................................................................................................................................... 22
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5.11.1 General ................................................................................................................................................. 22
5.11.2 Grounding protection ......................................................................................................................... 22
5.11.3 Lightning protection ........................................................................................................................... 22
5.11.4 Static electricity at fuelling ................................................................................................................ 22
5.11.5 Static electricity at offloading ............................................................................................................ 22
5.12 Emergency shut down ....................................................................................................................... 23
6 LNG supply interface .......................................................................................................................... 23
6.1 Application .......................................................................................................................................... 23
6.2 Filling connector ................................................................................................................................. 23
6.3 Maximum LNG filling pressure .......................................................................................................... 24
6.3.1 Filling pressure limits during offloading .......................................................................................... 24
6.3.2 Prevention of overpressurizing ......................................................................................................... 24
6.3.3 Precautions ......................................................................................................................................... 24
6.4 Maximum fill level ............................................................................................................................... 24
6.5 Prevention of back flow ..................................................................................................................... 25
6.6 Bleed connections .............................................................................................................................. 25
6.7 LNG tanker ........................................................................................................................................... 25
6.7.1 Immobility ............................................................................................................................................ 25
6.7.2 Anti drive-away equipment ................................................................................................................ 25
6.7.3 Shut-off the engine ............................................................................................................................. 25
6.7.4 Equalizing the potentials ................................................................................................................... 25
6.7.5 ESD shut-off function ......................................................................................................................... 25
7 LNG storage tank ................................................................................................................................ 26
7.1 Application .......................................................................................................................................... 26
7.2 Design .................................................................................................................................................. 26
7.3 Safety ................................................................................................................................................... 26
7.3.1 Maximum allowable pressure ............................................................................................................ 26
7.3.2 Pressure relief device ......................................................................................................................... 26
7.3.3 Emergency isolation valve ................................................................................................................. 28
7.3.4 Inertization ........................................................................................................................................... 28
7.4 Design of the LNG storage tank ........................................................................................................ 28 7.4.1 Design concept ................................................................................................................................... 28
7.4.2 The inner vessel supports ................................................................................................................. 28
7.4.3 The outer vessel.................................................................................................................................. 28
7.4.4 LNG storage tank piping .................................................................................................................... 29
7.4.5 Buried storage tank ............................................................................................................................ 29
7.4.6 Mobile storage tank ............................................................................................................................ 29
7.4.7 LNG storage tank identification ........................................................................................................ 30
7.5 Instrumentation ................................................................................................................................... 30
7.5.1 Pressure gauge ................................................................................................................................... 30
7.5.2 Liquid level gauge............................................................................................................................... 30
7.5.3 Vacuum monitoring ............................................................................................................................ 30
7.6 Foundations ........................................................................................................................................ 30
8 Connection of pumps to the LNG storage tank ............................................................................... 31
8.1 General ................................................................................................................................................. 31
8.2 NPSH requirements ............................................................................................................................ 31
8.3 Vapour return ...................................................................................................................................... 31
8.4 Protection against weather ................................................................................................................ 31
8.5 Accessibility ........................................................................................................................................ 31
9 LNG centrifugal pump (including ancillaries) .................................................................................. 31
9.1 General provisions ............................................................................................................................. 31
9.2 Liquid inlet to the centrifugal pump .................................................................................................. 31
9.3 Centrifugal pump design ................................................................................................................... 31
9.4 Vibration .............................................................................................................................................. 32
9.5 Detection of shaft seal leak ............................................................................................................... 32
9.6 Detection of cavitation ....................................................................................................................... 32
10 LNG reciprocating pump for LCNG fuelling (including ancillaries) .............................................. 32
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ISO/DIS 16924
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10.1 General provisions .............................................................................................................................. 32
10.2 Liquid supplied to the reciprocating pump ...................................................................................... 32
10.3 Design ................................................................................................................................................... 32
10.4 Vibration ............................................................................................................................................... 33
10.5 Pulsation............................................................................................................................................... 33
11 Commonalities for LNG centrifugal and reciprocating pumps ....................................................... 33
11.1 Instrumentation ................................................................................................................................... 33
11.1.1 Suction line .......................................................................................................................................... 33
11.1.2 System instrumentation and accessories ........................................................................................ 33
11.2 Markings of a pump ............................................................................................................................. 33
11.3 Instructions .......................................................................................................................................... 34
11.4 Training................................................................................................................................................. 34
12 Vaporizers and heaters ....................................................................................................................... 34
12.1 Application ........................................................................................................................................... 34
12.2 Design of vaporizers and heaters ...................................................................................................... 35
12.3 Ambient air vaporizer .......................................................................................................................... 35
12.3.1 General requirements ......................................................................................................................... 35
12.3.2 Defrosting ............................................................................................................................................. 35 12.3.3 Ambient pressure-build-up and saturation vaporizers ................................................................... 36
12.4 Electric vaporizer/heater ..................................................................................................................... 36
12.5 Water bath vaporizer ........................................................................................................................... 36
12.6 Fired vaporizers ................................................................................................................................... 36
12.7 Remotely heated vaporizers ............................................................................................................... 36
13 High pressure odorizer ....................................................................................................................... 37
13.1 Function................................................................................................................................................ 37
13.2 Safety .................................................................................................................................................... 37
13.3 Monitoring ............................................................................................................................................ 37
13.4 Control .................................................................................................................................................. 38
13.5 Odorant ................................................................................................................................................. 38
13.6 Injection point ...................................................................................................................................... 38
13.7 Dynamics of function .......................................................................................................................... 38
14 High pressure (CNG) storage ............................................................................................................. 38
15 LNG dispenser ..................................................................................................................................... 38
15.1 Function................................................................................................................................................ 38
15.2 Hazardous areas .................................................................................................................................. 39
15.3 Dispenser components ....................................................................................................................... 39
15.4 Safety devices ...................................................................................................................................... 39
15.4.1 General ................................................................................................................................................. 39
15.4.2 Breakaway system .............................................................................................................................. 40
15.4.3 Protection against collision................................................................................................................ 40
15.4.4 Attendance during fuelling ................................................................................................................. 40
15.4.5 Isolation switch .................................................................................................................................... 40
15.5 LNG fuelling nozzle ............................................................................................................................. 40
15.5.1 Connection ........................................................................................................................................... 40
15.5.2 Design ................................................................................................................................................... 40
15.5.3 Storing .................................................................................................................................................. 41
15.5.4 Prevention of frosting of the nozzle mating surface ....................................................................... 41
15.6 Fuelling hose ....................................................................................................................................... 41
15.6.1 Hose assembly .................................................................................................................................... 41
15.6.2 Hose properties ................................................................................................................................... 41
15.6.3 Marking ................................................................................................................................................. 42
15.6.4 Strength ................................................................................................................................................ 42
15.6.5 Venting.................................................................................................................................................. 42
15.7 Flowmeter ............................................................................................................................................. 42
15.8 Vapour recovery .................................................................................................................................. 43 15.9 Cabinet.................................................................................................................................................. 43
15.10 Inspections ........................................................................................................................................... 43
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16 CNG dispenser .................................................................................................................................... 43
17 Natural gas compressor ..................................................................................................................... 44
18 Station pipework and ancillary devices ........................................................................................... 44
18.1 Station pipework ................................................................................................................................. 44
18.2 Thermal stress of cryogenic pipelines ............................................................................................. 44 18.3 Prevention of pressurization by cryogenic liquid ........................................................................... 44
18.4 Drains and vents ................................................................................................................................. 44
18.5 Pipework .............................................................................................................................................. 45
18.5.1 General provisions ............................................................................................................................. 45
18.5.2 Above ground pipework ..................................................................................................................... 45
18.5.3 Underground pipework ...................................................................................................................... 45
18.5.4 Pipelines in ducts ............................................................................................................................... 45
18.5.5 Flexible connections .......................................................................................................................... 46
19 Instrumentation and control system................................................................................................. 46
19.1 Thermometers ..................................................................................................................................... 46
19.2 Pressure gauges ................................................................................................................................. 46
19.3 Gas and flame detection system ....................................................................................................... 46
19.4 Control systems .................................................................................................................................. 46
20 Emergency shutdown (ESD) system and procedures .................................................................... 46
20.1 Procedure ............................................................................................................................................ 46
20.2 Emergency power ............................................................................................................................... 46
20.3 Activation ............................................................................................................................................. 47
20.4 Action ................................................................................................................................................... 47
20.5 Manual emergency shutdown devices ............................................................................................. 47
20.6 Reset .................................................................................................................................................... 47
21 Electrical equipment and wiring ........................................................................................................ 47
21.1 General ................................................................................................................................................. 47
21.2 Safety of electricity with natural gas ................................................................................................ 48
21.2.1 Interface ............................................................................................................................................... 48
21.2.2 Primary seal ......................................................................................................................................... 48
21.2.3 Additional seal .................................................................................................................................... 48
21.2.4 Conduit seals ...................................................................................................................................... 48
21.2.5 Detection vents ................................................................................................................................... 48
22 Installation and construction ............................................................................................................. 48
22.1 Permanent joints ................................................................................................................................ 48
22.2 Traceability .......................................................................................................................................... 49
22.3 Quality manual .................................................................................................................................... 49
22.4 Installation of electrical equipment................................................................................................... 49
23 Inspection and testing ........................................................................................................................ 49
23.1 Qualified inspector ............................................................................................................................. 49
23.2 Pressure testing .................................................................................................................................. 49 23.3 Leak testing ......................................................................................................................................... 49
23.4 Inspection and testing of electrical systems ................................................................................... 49
23.5 Commissioning ................................................................................................................................... 50
23.5.1 General provisions ............................................................................................................................. 50
23.5.2 Purging ................................................................................................................................................ 50
23.5.3 Functional testing ............................................................................................................................... 50
23.6 First filling of storage tank and other components ......................................................................... 50
24 Movable LNG fuelling station ............................................................................................................ 51
24.1 General requirements ......................................................................................................................... 51
24.2 Anchoring ............................................................................................................................................ 51
24.3 Containment ........................................................................................................................................ 51
25 Mobile LNG fuelling station ............................................................................................................... 51 25.1 General requirements ......................................................................................................................... 51
25.2 Anchoring ............................................................................................................................................ 51
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ISO/DIS 16924
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25.3 Containment ......................................................................................................................................... 51
25.4 Design ................................................................................................................................................... 51
25.5 Additional requirements for operation .............................................................................................. 52
26 Operation .............................................................................................................................................. 52
26.1 Offloading of LNG from tanker to the storage tank ......................................................................... 52
26.2 Fuelling ................................................................................................................................................. 52
26.2.1 General provisions .............................................................................................................................. 52
26.2.2 Training of the personal ...................................................................................................................... 52
26.2.3 Self service LNG fuelling stations for registered customers .......................................................... 52
26.3 Installation and operating instructions ............................................................................................. 53
26.4 Potential hazard ................................................................................................................................... 53
26.5 Emergency plan ................................................................................................................................... 53
26.6 Maintaining the emergency shutdown (ESD) ................................................................................... 53
27 Periodic inspection ............................................................................................................................. 54
27.1 General ................................................................................................................................................. 54
27.2 Inspection and re-testing of the safety relief valves ........................................................................ 54
27.3 Safety and fire protection equipment ................................................................................................ 55
28 Maintenance ......................................................................................................................................... 55
28.1 Preventive maintenance planning ..................................................................................................... 55
28.2 Maintenance procedures .................................................................................................................... 55
28.3 Maintenance safety ............................................................................................................................. 55
28.4 Draining of the LNG storage tank ...................................................................................................... 55
Annex A (informative) Example flow diagram of an LNG station ................................................................. 56
Annex B (informative) Example flow diagram of an LCNG station .............................................................. 57
Annex C (informative) Example flow diagram of an LNG and LCNG station .............................................. 58
Annex D (informative) LNG identification mark of an LNG station .............................................................. 59
Annex E (informative) Recommended size of the hazardous areas of major units of the station
according to NFPA 52 ......................................................................................................................... 61
Annex F (informative) Recommendations on the content of the cryogenic pump operation manual ..... 62
F.1 Operation instructions ........................................................................................................................ 62
F.2 Information concerning the operation .............................................................................................. 63
F.3 Delineation of the working area ......................................................................................................... 63
F.4 Servicing instruction ........................................................................................................................... 63
F.5 List of parts required for servicing .................................................................................................... 64
Annex G (informative) Recommendations for installation of a centrifugal pump...................................... 65
Annex H (informative) Recommendations for centrifugal pumps design ................................................... 66
H.1 Pump design with shaft seal .............................................................................................................. 66
H.2 Pump design with submerged motor ................................................................................................ 66
Annex I (informative) Process requirements for the effective cryogenic pump operation ....................... 67
I.1 NPSH ..................................................................................................................................................... 67
I.2 Cavitation ............................................................................................................................................. 67
I.3 Loss of prime ....................................................................................................................................... 67
I.4 Pressure losses ................................................................................................................................... 67
I.5 Heat in leak ........................................................................................................................................... 67
Annex J (informative) Recommendations for installation of a reciprocating pump .................................. 69
Annex K (informative) Example flow diagram of a high-pressure odorizer ................................................ 71
Bibliography ...................................................................................................................................................... 72
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ISO/DIS 16924 Natural gas fuelling stations - LNGstations for fuelling vehicles