CJ/T 246-2007 Technical specification of preformed directly buried steam insulating pipeline accessories for municipal heat-supply

CJ/T 246-2018 Preformed directly buried steam insulating pipes and fittings for urban heating

GB/T 8923-1988 GB/T 12459-2005 Steel butt-welding seamless pipe fittings GB 50235-1997 CJJ/T 81-1998 CJ/T 155-2001 Preformed directly buried insulating fittings with polyurethane[PUR]foamed-plastics and high density polyethylene[PE]casing pipes CJ/T 200-2004 Preformed directly buried steam insulating pipes technical-specification for heating in city CJJ 104-2005 CJ/T 3016 GB/T 2829-2002 Sampling procedures and tables for periodic inspection by attributes (Apply to inspection of process stability) GB/T 3323-1987 Methods for radiographic inspection and classification of radiographs for fusion welded butt joints in steel GB/T 3323-2005 Radiographic examination of fusion welded joints in metallic materials GB/T 3323.1-2019 Non-destructive testing of welds—Radiographic testing—Part 1:X-and gamma-ray techniques with film GB/T 3323.2-2019 Non-destructive testing of welds—Radiographic testing—Part 2:X-and gamma-ray techniques with digital detectors GB/T 13401-1992 Steel plate butt-welding pipe fittings GB/T 13401-2005 Steel plate butt-welding pipe fittings GB/T 13401-2017 Steel buttwelding pipe fittings—Technical specification GB/T 17393-1998 Standard specification of thermal insulation materials for use over austenitic stainless steel GB/T 17393-2008 Specification for thermal insulation for use in contact with austenitic stainless steel JB/T 1611-1993 Boiler tube specification (Technical conditions) JC/T 618-2019 Chemical analysis methods for solutes such as chloride, fluoride, silicate, and sodium in insulation materials SY 0063-1992 Pipeline corrosion prevention layer leak testing method JC/T 618-2005 Chemical analysis methods for solutes containing chloride, fluoride, silicate, and sodium in thermal insulation materials CJ/T 3016.2-1994 CJ/T 3016.2-1994 Urban Heating Compensator Welding Thickness Expansion Joint。 JB/T 4730.3-2005 Nondestructive testing of pressure equipments—Part 3:Ultrasonic testing CJJ 28-2014 Code for construction and acceptance of city heating pipelines GB/T 13401-2025 Steel buttwelding piping fittings—Technical specification GB/T 2829-2025 Sampling procedures and tables for periodic inspection by attributes(Apply to inspection of process stability)