本标准涵盖150、250和300级螺纹可锻铸铁活接头。它还包含为NPS 1/8接头使用钢的规定。本标准包括设计、压力温度额定值、尺寸、标记、材料、接头和阀座、螺纹、静水压强度、抗拉强度、气压试验、取样、涂层和尺寸的要求。

This Standard covers threaded malleable iron unions, classes 150, 250, and 300.It also contains provisions for using steel for NPS 1/8 unions. This Standard includes requirements for design, pressure-temperature ratings, size, marking, materials, joints and seats, threads, hydrostatic strength, tensile strength, air pressure test, sampling, coatings, and dimensions.