前言本临时要求（IR）是为北美的机构制定的，仅用于压缩天然气汽车（NGV）燃料喷嘴和容器的检查、测试和认证。因此，该范围指的是NGV加油系统中使用的喷嘴和插座，而不是系统。美国天然气协会（A.G.A.）对天然气加油连接装置的要求（第1-90号）和加拿大天然气协会对NGV喷嘴和插座的认证要求（CR 90-005草案）为该临时要求提供了依据。从安全和性能角度来看，根据本临时要求认证的喷嘴将与所有列出的外形和系统压力兼容的插座在功能上兼容。同样，从安全和性能的角度来看，根据本临时要求认证的容器在功能上与所有列出的具有兼容外形和系统压力的喷嘴兼容。 鉴于许多制造商可能有许多喷嘴和插座，出于安全原因，所有这些都必须相互兼容，因此规定了一系列“标准”插座外形。这些标准外形包括强制性设计规范（配合材料、几何形状和公差），必须在提交的喷嘴或容器的认证中使用这些规范。该设计应独特，且目前未投入商业使用，且仅适用于压缩天然气。目前，北美可能有三种车辆系统工作压力；16500千帕（2400磅平方英寸）、20700千帕（3000磅平方英寸）和24800千帕（3600磅平方英寸）。因此，喷嘴和加气口的设计必须能够防止加油站以高于车辆的工作压力为车辆加油。 然而，理想的情况是，车辆可以由工作压力低于车辆的加油站加油。这个问题在喷嘴和容器的几何结构中得到了解决。所有喷嘴和插座的设计应确保其工作压力为16500千帕（2400磅/平方英寸）、20700千帕（3000磅/平方英寸）或24800千帕（3600磅/平方英寸），如适用。喷嘴和插座的结构和性能基于以下观察结果:三个主要参数影响用户安全和系统兼容性。1.工作压力。目前，北美可能有三种车辆系统工作压力；16500千帕（2400磅平方英寸）、20700千帕（3000磅平方英寸）和24800千帕（3600磅平方英寸）。因此，喷嘴和加气口的设计必须能够防止加油站以高于车辆的工作压力为车辆加油。 然而，理想的情况是，车辆可以由工作压力低于车辆的加油站加油。这个问题在喷嘴和容器的几何结构中得到了解决。所有喷嘴和插座的设计应确保其工作压力为16500千帕（2400磅/平方英寸）、20700千帕（3000磅/平方英寸）或24800千帕（3600磅/平方英寸），如适用。2.断开通风。在高压下输送燃油的喷嘴必须在从容器上断开之前完全安全地减压。本临时要求涉及三种类型的喷嘴，如下所述:1型喷嘴-对于1型喷嘴，排气阀操作机构是喷嘴的一部分。术语“整体式”是指操纵杆或操作机构的一次操作首先安全地排出容器止回阀和喷嘴入口阀之间截留的气体，然后安全地将喷嘴从容器上断开。 这种喷嘴主要用于但不限于在公共加油站使用。2型喷嘴-对于2型喷嘴，排气阀操作机构位于喷嘴外部。在断开此类喷嘴之前，需要进行通风。此类喷嘴仅供受过培训的操作员使用。3型喷嘴-使用3型喷嘴，加油软管在加油机关闭时自动减压[通常低于340 kPa（50 psi）]。在断开喷嘴的同时，喷嘴可在插座止回阀和喷嘴进口阀之间排放低压气体。此类喷嘴仅供受过培训的操作员使用。3.设计寿命。使用频率是需要考虑的最终参数。由于喷嘴/插座的使用频率不同（即。 e、 （公共部门、车队员工和住宅），所有插座将在10000个连接/断开周期进行测试，以符合本临时要求。此外，所有喷嘴应根据以下频率使用分类（如适用）进行测试:A类喷嘴——该等级规定了高频使用，循环寿命为100000。这相当于3年内每天约100次填充。B类喷嘴——该类规定了中频使用，循环寿命为20000次。这相当于5年内每天约10次填充。范围1。1.1本临时要求适用于新生产的压缩天然气汽车（NGV）燃料连接装置，以下简称装置，完全由新的、未使用的零件和材料制成。NGV加油连接装置应包括以下组件（如适用）: 1.插座和防护帽（安装在车辆上）（见第1.5条插座）；2.喷嘴（见第1.3条喷嘴）；和/或3。三通阀（喷嘴外部，安装在加油机系统中）（见第1.6条，三通阀）。1.1.2本临时要求是对CSA集团的补充？s美国国家标准/CSA压缩天然气汽车（NGV）燃料连接装置标准NGV 1-2006。1.1.3本临时要求适用于工作压力为24 800 kPa（3600 psi）的装置，以下简称本临时要求（见第1.9.1-c条）:“P30HD”-20 700 kPa（3000 psi）“P36HD”-24 800 kPa（3600 psi）1.1.4本临时要求适用于具有标准化配合部件的装置（见第1.5.5条和第1.7条互换性）1.1.5本临时要求适用于以下装置:（1）防止天然气车辆由工作压力高于车辆的加油站加油；（2）允许天然气车辆由工作压力等于或低于车辆燃料系统工作压力的加油站加油。 1.1.6除非另有规定，否则本临时要求中使用的所有尺寸均采用公制单位[国际单位制（SI）]。如果本临时要求中给出的测量值之后是其他单位的等效值，则第一个规定值应视为规范值。1.1.7附件A包含本临时要求中特别引用的标准列表，以及这些引用标准的来源。1.1.8就本临时要求而言，压缩天然气应符合ANSI/NFPA 52《压缩天然气（CNG）车辆燃料系统标准》中“气体质量”项下的规范。1.1.9除非另有规定，否则本临时要求中提及的所有“psi或kPa”均应视为表压。

PrefaceThis Interim Requirement (IR) is being developed for agencies in North America to use for examination, testing and certification of compressed Natural Gas Vehicle (NGV) fueling nozzles and receptacles only. As such, the scope refers to nozzles and receptacles used in the NGV fueling system, and not to the system. The American Gas Association (A.G.A.) Requirements for Natural Gas Refueling Connection Devices (No. 1-90) and Canadian Gas Association Certification Requirement for NGV Nozzles and Receptacles (Draft CR 90-005) provided a basis for this Interim Requirement. A nozzle certified to this Interim Requirement will be functionally compatible from a safety and performance perspective with all listed receptacles of compatible profile and system pressure. Similarly, a receptacle certified to this Interim Requirement will be functionally compatible from a safety and performance perspective with all listed nozzles of compatible profile and system pressure. Whereas there may be a multitude of nozzles and receptacles by a host of manufacturers, all of which for safety reasons must be compatible with each other, a series of "standard" receptacle profiles have been specified. These standard profiles incorporate the mandated design specifications (mating materials, geometry and tolerances) which must be utilized in the certification of a submitted nozzle or receptacle. The design shall be unique and not currently in commercial use and shall only be used for compressed natural gas. Currently, three vehicle system service pressures may be operated in North America; 16 500 kPa (2400 psi), 20 700 kPa (3000 psi) and 24 800 kPa (3600 psi). Consequently, the nozzle and receptacle must be designed in a manner which will prevent a vehicle from being fueled by a dispenser station with a service pressure higher than the vehicle. However, it is desirable that a vehicle can be fueled by a dispenser station with a service pressure lower than the vehicle. This issue is addressed in the geometry of the nozzle and receptacle. All nozzles and receptacles shall be designed to have a service pressure of either 16 500 kPa (2400 psi), 20 700 kPa (3000 psi) or 24 800 kPa (3600 psi), as applicable. The construction and performance of nozzles and receptacles are based on the observation that three main parameters affect user safety and system compatibility. 1.Service Pressure.Currently, three vehicle system service pressures may be operated in North America; 16 500 kPa (2400 psi), 20 700 kPa (3000 psi) and 24 800 kPa (3600 psi). Consequently, the nozzle and receptacle must be designed in a manner which will prevent a vehicle from being fueled by a dispenser station with a service pressure higher than the vehicle. However, it is desirable that a vehicle can be fueled by a dispenser station with a service pressure lower than the vehicle. This issue is addressed in the geometry of the nozzle and receptacle. All nozzles and receptacles shall be designed to have a service pressure of either 16 500 kPa (2400 psi), 20 700 kPa (3000 psi) or 24 800 kPa (3600 psi), as applicable. 2.Disconnect Venting.Nozzles transferring fuel under high pressure must be fully and safely depressurized prior to being disconnected from the receptacle. This Interim Requirement addresses three types of nozzles, described as follows:Type 1 Nozzle- With a Type 1 Nozzle, the vent valve operating mechanism is integral to the nozzle. The term "integral" means that a single operation of a lever or operating mechanism first safely vents the gas trapped between the receptacle check valve and the nozzle inlet valve, and then safely disconnects the nozzle from the receptacle. This type nozzle is primarily intended but not restricted to use at public fill stations.Type 2 Nozzle- With a Type 2 nozzle, the vent valve operating mechanism is external to the nozzle. Venting is required prior to disconnection of this type of nozzle. This type of nozzle is intended to be used by trained operators only.Type 3 Nozzle- With a Type 3 nozzle, the fueling hose is automatically depressurized [typically below 340 kPa (50 psi)] at dispenser shutdown. The nozzle may vent low pressure gas between the receptacle check valve and the nozzle inlet valve coincident with the disconnection of the nozzle. This type of nozzle is intended to be used by trained operators only.3.Design Life.Frequency of use is the final parameter to be considered. Since frequency of use will differ with the nozzle/receptacle application (i.e., public sector, fleet employee and residential), all receptacles will be tested at 10,000 connect/disconnect cycles for compliance with this Interim Requirement. In addition, all nozzles shall be tested according to the following frequency use classifications, as applicable:Class A Nozzle- This class specifies high frequency use, with a cycle life of 100,000. This equates to approximately 100 fills per day for 3 years.Class B Nozzle- This class specifies medium frequency use, with a cycle life of 20,000 cycles. This equates to approximately 10 fills per day for 5 years.Scope1.1.1 This Interim Requirement applies to newly produced compressed Natural Gas Vehicle (NGV) fueling connection devices, hereinafter referred to as devices, constructed entirely of new, unused parts and materials. NGV fueling connection devices shall consist of the following components, as applicable: 1. Receptacle and protective cap (mounted on vehicle) (see Clause 1.5, Receptacles); 2. Nozzle (see Clause 1.3, Nozzles); and/or 3. Three-way valve (external to nozzle and mounted in the fuel dispenser system) (see Clause 1.6, Three-Way Valve). 1.1.2 This Interim Requirement supplements CSA Group?s American National Standard/CSA Standard for Compressed Natural Gas Vehicle (NGV) Fueling Connection Devices NGV 1-2006. 1.1.3 This Interim Requirement applies to devices which have a service pressure of 24 800 kPa (3600 psi), hereinafter referred to in this Interim Requirement as the following (see Clause 1.9.1-c):"P30HD" - 20 700 kPa (3000 psi) "P36HD" - 24 800kPa (3600 psi)1.1.4 This Interim Requirement applies to devices with standardized mating components (see Clauses 1.5.5, and 1.7, Interchangeability.) 1.1.5 This Interim Requirement applies to devices which (1) prevent natural gas vehicles from being fueled by dispenser stations with service pressures higher than the vehicle, and (2) allow natural gas vehicles to be fueled by dispenser stations with service pressures equal to or lower than the vehicle fuel system service pressure. 1.1.6 All dimensions used in this Interim Requirement are in metric units [International System of Units (SI)], unless otherwise specified. If a value for measurement, as given in this Interim Requirement, is followed by an equivalent value in other units, the first stated value is to be regarded as the specification. 1.1.7 Exhibit A contains a list of standards specifically referenced in this Interim Requirement, and sources from which these referenced standards may be obtained. 1.1.8 For the purposes of this Interim Requirement, compressed natural gas shall comply with the specifications under "Gas Quality", in the Standard for Compressed Natural Gas (CNG) Vehicular Fuel Systems, ANSI/NFPA 52. 1.1.9 All references to "psi or kPa" throughout this Interim Requirement are to be considered gage pressures unless otherwise specified.