规定了公称尺寸DN 300以下的灰铸铁和球墨铸铁管及管件的性能和一般要求，这些管件拟用于内部工作压力可忽略不计的情况。附录说明了管件的首选设计。

Specifies performance and general requirements for grey and ductile cast iron pipes and fittings up to nominal size DN 300 intended to be used where internal working pressure is considered negligible. An Appendix illustrates preferred designs of pipe fittings.