The group standard describes the dimensions, fillers, gaskets, and welding of stainless steel linings lined with stainless steel pipe fittings. Based on test data and actual usage, it stipulates the terms and definitions, classifications and codes, materials and Manufacturing, requirements, test methods, inspection rules, marking, packaging, transportation and storage; mainly suitable for transporting water (cold and hot water for domestic use, direct drinking water from pipes, water for the food industry, fire water supply, air conditioning circulating water, sewage, etc.), petroleum , chemical industry, gas and other pipeline connections are lined with stainless steel pipe fittings for use by design units, purchasing units, owners and construction units.