This Standard covers malleable iron threaded fittings, Classes 150 and 300. It also contains provisions for using steel for caps and couplings in Class 150 for NPS 3∕8 and smaller. This Standard includes
(a) pressure–temperature ratings
(b) size and method of designating openings of reducing fittings
(c) marking
(d) material
(e) dimensions and tolerances
(f) threading
(g) coatings
本标准涵盖可锻铁螺纹配件,等级为150和300。它还包含将钢用于NPS 3∕8及以下的150级盖和联轴器的规定。本标准包括
(a) 压力-温度额定值
(b) 减速配件开口的尺寸和指定方法
(c) 标记
(d) 材料
(e) 尺寸和公差
(f) 螺纹加工
(g) 涂料