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.

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This document specifies the minimum safety interface requirement for the unloading stop system between the LNG road tanker and LNG fuelling station.
This document consists of two main topics:
-   functional description of the unloading stop system;
-   technical layout description of the unloading stop system.

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ISO 16924:2016 specifies the design, construction, operation, maintenance and inspection of stations for fuelling liquefied natural gas (LNG) to vehicles, including equipment, safety and control devices.
ISO 16924:2016 also specifies the design, construction, operation, maintenance and inspection of fuelling stations for using LNG as an onsite source for fuelling CNG to vehicles (LCNG fuelling stations), including safety and control devices of the station and specific LCNG fuelling station equipment.
NOTE          Specific CNG equipment is dealt with in ISO 16923.
ISO 16924:2016 is applicable to fuelling stations receiving LNG and other liquefied methane-rich gases that comply with local applicable gas composition regulation or with the gas quality requirements of ISO 13686.
ISO 16924:2016 includes all equipment from the LNG storage tank filling connection up to the fuelling nozzle on the vehicle. The LNG storage tank filling connection itself and the vehicle fuelling nozzle are not covered in this document.
ISO 16924:2016 includes fuelling stations having the following characteristics:
-      private access;
-      public access (self-service or assisted);
-      metered dispensing and non metered dispensing;
-      fuelling stations with fixed LNG storage;
-      fuelling stations with mobile LNG storage;
-      movable fuelling stations;
-      mobile fuelling stations;
-      multi-fuel stations.

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