BS ISO 15500-12:2015规定了压力释放阀（PRV）的试验和要求，该阀是一种压缩式阀门 用于ISO 3833中定义的机动车辆类型的天然气燃料系统部件。ISO 15500的本部分适用于根据ISO 15403-1（单一燃料、， 双燃料或双燃料应用）。不适用于以下情况:位于蒸发器上游的液化天然气（LNG）燃料系统部件，包括蒸发器；燃料容器；固定式燃气发动机；集装箱安装硬件；电子燃料管理；加油容器。注1:应认识到，本文中未具体涵盖的其他组件可通过以下方式进行检查: 符合ISO 15500本部分的标准，并根据适当的功能测试进行测试。 注2:ISO 15500本部分中提及的所有压力均应视为表压，除非 另有规定。注3:ISO 15500的这一部分是基于天然气作为燃料的工作压力为20 MPa[200 bar1]，在15°C下设定。其他工作压力可以通过调整适当的系数（比率）来调节。例如，25兆帕（250巴）的工作压力系统需要将压力乘以1,25。交叉引用:ISO 15500-1ISO 15500-2ISO 3833 ISO 15403-1ISO/TR 15403-2购买时可用的所有当前修订版均包含在本文件的购买中。

BS ISO 15500-12:2015 specifies tests and requirements for the pressure relief valve (PRV), a compressed natural gas fuel system component intended for use on the types of motor vehicles defined in ISO 3833.This part of ISO 15500 is applicable to vehicles using natural gas in accordance with ISO 15403-1 (monofuel, bi-fuel, or dual-fuel applications). It is not applicable to the following:liquefied natural gas (LNG) fuel system components located upstream of, and including, the vaporizer;fuel containers;stationary gas engines;container mounting hardware;electronic fuel management;refuelling receptacles.NOTE 1 It is recognized that miscellaneous components not specifically covered herein can be examined to meet the criteria of this part of ISO 15500 and tested according to the appropriate functional tests.NOTE 2 All references to pressure in this part of ISO 15500 are to be considered gauge pressures unless otherwise specified.NOTE 3 This part of ISO 15500 is based upon a service pressure for natural gas as a fuel of 20 MPa [200 bar1)] settled at 15 °C. Other service pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio). For example, a 25 MPa (250 bar) service pressure system will require pressures to be multiplied by 1,25.Cross References:ISO 15500-1ISO 15500-2ISO 3833ISO 15403-1ISO/TR 15403-2All current amendments available at time of purchase are included with the purchase of this document.