CEN/TC 326 - Gas supply for Natural Gas Vehicles (NGV)

This document gives guidelines for safe fuelling operations of vehicles that use liquefied natural gas (LNG) as a fuel for propulsion, covering the activities and procedures to be followed for safe operation. It provides procedures applicable to different fuelling systems and technologies.
NOTE   Regarding the responsibility surrounding the training of drivers of LNG vehicles, see the framework of Directive 89/391 EEC.

This document provides requirements for operation of vehicles that use liquefied natural gas (LNG) as a fuel for propulsion, covering various aspects of LNGV workshops including activities, risk management, planning, personnel, layout, systems and operations. It provides requirements regarding the management of LNGV including use, parking, fuelling for commissioning, inspection, installation, repair and maintenance, disposal, transportation and documentation.
This document is applicable to the management of LNG vehicles.

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.

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.

This document covers the design and manufacturing, installation and testing, operation and maintenance for vehicle fuelling appliances (VFAs) - the assemblies of the pressure equipment with
- maximum compressor flow rate 20 scm/h,
- maximum fuelling pressure 200 bar at 15°C,
intended for the non-commercial fuelling of natural gas vehicles (NGVs) with compressed natural gas (CNG).
This document is applicable to VFAs supplied with natural gas as defined in local applicable gas composition regulations or EN 16723-2, or with other gases meeting these requirements including biomethane, upgraded coal-bed methane (CBM) and gas from liquefied natural gas (LNG) vaporizer (on-site or off-site).
In case of combination of the certified VFA assembly with additional equipment, such as external storage and/or dispenser, EN ISO 16923 applies to the new assembly - the certified VFA assembly with added external equipment.
In case of combinations of interconnected VFA assemblies, EN ISO 16923 applies to the whole new assembly of the certified VFA assemblies.

This document provides requirements for operation of vehicles that use compressed natural gas (CNG) as a fuel for propulsion, covering various aspects of NGV workshops including activities, risk management, planning, personnel, layout, systems and operations. It provides requirements regarding the management of NGVs including use, parking, fuelling for commissioning, inspection, installation, repair and maintenance, disposal, transportation and documentation.
This document is applicable to the management of CNG vehicles with a fuel system pressure of 20 MPa (200 bar) at 15 °C. This document can also be applied to vehicles with higher fuel system pressures, taking into account additional safety aspects.
This document also applies to servicing, repair and maintenance of NGVs when work is not performed on the gas fuel system.

This document provides guidance to support organizations with the implementation of the European standards on CNG and LNG stations for fuelling vehicles (i.e. EN-ISO 16923:2018 and EN-ISO 16924:2018, respectively).
This document cross-references European standards to the international standards listed in EN-ISO 16923:2018 and EN-ISO 16924:2018 and links these standards to relevant European Directives, where applicable.

ISO 16923:2016 covers the design, construction, operation, inspection and maintenance of stations for fuelling compressed natural gas (CNG) to vehicles, including equipment, safety and control devices.
ISO 16923:2016 also applies to portions of a fuelling station where natural gas is in a gaseous state and dispensing CNG derived from liquefied natural gas (LCNG) according to ISO 16924.
ISO 16923:2016 applies to fuelling stations supplied with natural gas as defined in local applicable gas composition regulations or ISO 13686. It also applies to other gases meeting these requirements including biomethane, upgraded coal-bed methane (CBM) and gas supplies coming from LNG vaporization (on-site or off-site).
ISO 16923:2016 includes all equipment for downstream gas supply connection (i.e. point of separation between the CNG fuelling station piping and the pipeline network). Fuelling station nozzles are not defined in this document.
ISO 16923:2016 covers fuelling stations with the following characteristics:
-      slow fill;
-      fast fill;
-      private access;
-      public access (self-service or assisted);
-      fuelling stations with fixed storage;
-      fuelling stations with mobile storage (daughter station);
-      multi-fuel stations.
ISO 16923:2016 is not applicable to domestic CNG fuelling devices without buffer storage.
NOTE          ISO 16923:2016  is based on the condition that the gas entering the fuelling station is odorized. For unodorized gas fuelling stations, additional safety requirements are included in Clause 10.

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.

This document covers the design and manufacturing, installation and testing, operation and maintenance of vehicle fuelling appliances (VFA) for domestic fuelling of vehicles with compressed natural gas (CNG).
This document is applicable to VFAs having the following technical limits:
-   maximum compressing capacity: 20 Nm3/h (NTP);
-   maximum internal storage volume for outdoor installation: 400 l;
-   maximum gas outlet pressure: 200 bar at 15 °C;
This document is applicable to VFAs supplied with natural gas as defined in local applicable gas composition regulations or EN 16723 2, or with other gases meeting these requirements including biomethane, upgraded coal-bed methane (CBM) and gas from liquefied natural gas (LNG) vaporizer (on-site or off-site).
This document applies to VFAs not incorporating gas outlet metering systems.

1.1 This Standard gives recommendations for the operation of vehicles fuelled with natural gas and operating at a fuel system pressure not exceeding 20MPa (200 bar) at 15°C. 1.2 This standard may be applied to higher system pressures, but due regard should then be given to safety aspects such as, ventilation rates, hazardous area requirements and other aspects associated with those higher pressures.