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BS EN 17921:2024

BS EN 17921:2024

$142.49

Natural gas fuelling stations. LNG unloading connector

Published By Publication Date Number of Pages
BSI 2024 24
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This document specifies a harmonized unloading connector for LNG road tanker at LNG fuelling stations. This document is also applicable to LNG RID applications. While LNG is also transported by rail, European regulations are organized through the International Carriage of Dangerous Goods by Rail (RID). The same configuration as defined by this document, can be utilized. This document includes requirements for (at least): – functional description of the LNG unloading receptacle and LNG unloading nozzle; – technical layout description of the LNG unloading receptacle. The technical layout description of the LNG unloading nozzle is not part of this document. The basic functional requirement of the LNG unloading connector are as follows: – to prevent leakage of methane during operation and in particular during disconnecting; – easy handling, no spillage and purging with nitrogen during disconnecting. The loading connector between the LNG road tanker and the LNG terminal is not covered by this document. See Figure 1.

PDF Catalog

PDF Pages PDF Title
2 undefined
8 1 Scope
9 2 Normative references
10 3 Terms and definitions
11 4 Functional requirements
4.1 General requirement
12 4.2 Functional description of the LNG unloading connector
4.2.1 General
4.2.2 Dry connector
4.2.3 Protective cap
4.2.4 Type of mounting
4.2.5 Positive locking
4.2.6 Safe disconnect
4.2.7 (Internal) Check valve
13 4.2.8 Venting and depressurization
4.2.9 Electrical conductivity
4.2.10 Spillage volume
5 Technical description of LNG unloading connector
5.1 Materials
5.1.1 General
5.1.2 LNG unloading connector
5.1.3 Corrosion protection
5.2 Pressure rating
5.2.1 Maximum allowable working pressure (MAWP)
5.2.2 Maximum working pressure
5.2.3 Design cycle life;
14 5.3 LNG unloading connector mounting
5.4 LNG unloading connector working temperature range
5.4.1 General
5.4.2 Material of the bodies of the LNG unloading receptacle and of the LNG unloading nozzle
15 6 Design of the LNG unloading connector
16 7 Tests requirements
7.1 General requirements
7.1.1 General
7.1.2 Ambient test conditions
17 7.1.3 Cryogenic test conditions
7.2 Shell tightness at ambient temperature
7.3 Shell strength at ambient temperature
7.4 Seat tightness at ambient temperature
7.5 Obturator strength at ambient temperature against atmosphere
18 7.6 Shell tightness at minimum working temperature
7.7 Seat tightness at minimum working temperature
7.7.1 General
7.7.2 Test arrangement for LNG unloading nozzle (Figure 3)
19 7.7.3 Test arrangement for LNG unloading receptacle (Figure 4)
7.8 Burst test
7.9 Operation test at minimum working temperature
20 7.10 Endurance test
7.11 Bending test
7.12 Drop test
21 7.13 Tensile force
7.13.1 Manual force in warm conditions
7.13.2 Manual force at cold conditions under frost
7.14 Corrosion resistance
22 8 Safety requirements
9 Maintenance

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BS EN 17921:2024
$142.49