本出版物代表了隔膜式气体位移计安全运行的基本标准，以及基本条件下0.5英寸水柱（125 Pa）压差下气体流量额定值为500立方英尺/小时（14.16 m3/h）及以上的坚固耐用结构。这项工作是多年经验的结果，辅以广泛的研究。本标准旨在帮助确保设备的高效性能和实质性结构。

This publication represents a basic standard for safe operation, and substantial and durable construction for diaphragm-type gas displacement meters having a gas flow rating of 500 cubic feet per hour capacity (14.16 m3/h) and over at 0.5-inch water column (125 Pa) differential pressure at base conditions. This work is the result of years of experience, supplemented by extensive research. The standard is designed to help ensure efficient performance and substantial construction of equipment.