CSA NGV 6.1:2016 pdf download.Compressed Natural Gas (CNG) fuel storage and delivery systems for road vehicles
1.1 This Recommended Practice applies to the design, installation, inspection, repair, and maintenance of a fuel storage and delivery system installed in an on road vehicle for use with compressed natural gas (CNG). This includes a fuel system on a self- propelled vehicle for the provision of motive power.
Note: This Recommended Practice is intended to cover the fuel storage and delivery system as defined in Figure 1.Elements downstream of the regulation device(s) or stage(s) such as the low pressure delivery line and injectors are not included in the Scope of this Recommended Practice.
1.2 This Recommended Practice does not apply to:
a) stationary engines;
b) mobile equipment using natural gas as a fuel for other than propulsion; or
c) electronic control module or controls strategy of a fuel management system.
Future editions of this Recommended Practice may include:
a) liquefied natural gas (LNG) fuel storage system;
b) compressed natural gas (CNG) portion of an LNG vehicle;
c) storage or utilization of natural gas on boats or trains;
d) powered industrial trucks;
e) off road applications including mining applications, all-terrain vehicles; and
f) motorcycles.
4.4.2 In the case of a CNG fuel system, the highest level system is the vehicle. The above process shall first be conducted at the vehicle level. The vehicle level requirements are then cascaded to the fuel system. The overall requirements of the fuel system shall also be in harmony with other vehicle criteria and interactions with other vehicle systems. The next step is to translate the requirements into engineering parameters that relate to system performance. Once the fuel system requirements are determined, the cascade continues to show that the detailed component designs align or exceed the system requirements and service conditions.
4.4.3 The system engineering approach was utilized to identify the key design requirements in Clause 5. It is highly recommended that the system engineering disciplines are considered for the specific customer and vehicle application. For a starting point of further consideration, Annex D provides a general listing of service conditions to consider in the system design in addition to the requirements in Clause 5. It should be noted that specific vehicle designs may have other or more service conditions. The designer should use system engineering to prepare a set of service conditions specific to the application. Extreme duty or high-cycle service are two fairly common special service conditions, but all higher level requirements should be reviewed and confirmed. Additional considerations could include parameters such as vehicle regulations and performance, regional component certifications, local AHJ approvals,customer guidelines and requirements, and special production part approval process.CSA NGV 6.1 pdf download.