BS 1821:1957
Specification for class I oxy-acetylene welding of steel pipelines and pipe assemblies for carrying fluids
被代替
发布日期 :
1957-02-28
实施日期 :
BS 1821:1952
Specification for oxy-acetylene welding of high temperature and high pressure pipelines
被代替
发布日期 :
1952-01-29
实施日期 :
BS 1821:1982
Specification for class I oxy-acetylene welding of ferritic steel pipework for carrying fluids
被代替
发布日期 :
1982-02-26
实施日期 :