CJ/T 200-2004 Preformed directly buried steam insulating pipes technical-specification for heating in city

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

GB 8923-1988 CJ/T 114-2000 Preformed directly buried insulating pipes for polyurethane[PUR]foamed-plastics and high density polyethylene[PE]protect pipes CJ/T 129-2001 CJ/T 3022 SY/T 0413-2002 GB/T 2828.1-2003 Sampling procedures for inspection by attributes—Part 1:Sampling schemes indexed by acceptance quality limit(AQL) for lot-by-lot inspection GB/T 2828.1-2012 Sampling procedures for inspection by attributes—Part 1:Sampling schemes indexed by acceptance quality limit(AQL) for lot-by-lot inspection GB/T 2828.2-2008 Sampling procedures for inspection by attributes—Part 2:Sampling plans indexed by limiting quality(LQ)for isolated lot inspection GB/T 2828.3-2008 Sampling procedures for inspection by attributes—Part 3:Skip-lot sampling procedures GB/T 2828.4-2008 Sampling procedures for inspection by attributes—Part 4:Procedures for assessment of declared quality levels GB/T 2828.5-2011 Sampling procedures for inspection by attributes—Part 5:System of sequential sampling plans indexed by acceptance quality limit(AQL)for lot-by-lot inspection GB/T 2828.10-2010 Sampling procedures for inspection by attributes—Part 10:Introduction to the GB/T 2828 series of standards for sampling for inspection by attributes GB/T 2828.11-2008 Sampling procedures for inspection by attributes—Part 11:Procedures for assessment of declared quality levels for small population GB/T 2829-2002 Sampling procedures and tables for periodic inspection by attributes (Apply to inspection of process stability) GB 3087-1999 Seamless steel tubes for low and medium pressure GB/T 3087-2008 Seamless steel tubes for low and medium pressure boiler GB/T 3087-2022 Seamless steel tubes and pipes for low and medium pressure boiler GB/T 3091-2001 Welded steel pipe for low pressure liquid delivery GB/T 3091-2008 Welded steel pipes for low pressure liquid delivery GB/T 3091-2015 Welded steel pipes for low pressure liquid delivery GB/T 8163-1999 Seamless steel tubes for liquid service GB/T 8163-2008 Seamless steel tubes for liquid service GB/T 8163-2018 Seamless steel pipes for liquid service GB/T 9711.1-1997 Petroleum and natural gas industries—Steel pipe for pipelines—Technical delivery conditions—Part 1:Pipes of requirements class A 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 CJ/T 140-2001 Methods measuring and evaluating heat loss and thermal insulation efficiency for thermal insulation construction of heating pipeline JC/T 618-2019 Chemical analysis methods for solutes such as chloride, fluoride, silicate, and sodium in insulation materials SY/T 5037-2023 Underground arc welding steel pipe for general fluid conveyance pipeline SY/T 5037-2018 Underground arc welding steel pipe for general fluid conveyance pipeline SY/T 5037-2012 Submerged arc welded steel pipe for general fluid conveying pipelines JC/T 618-2005 Chemical analysis methods for solutes containing chloride, fluoride, silicate, and sodium in thermal insulation materials SY/T 5037-2000 SY/T 5037-2000 Screw-Gap Soldering Steel Pipe for Low-Pressure Pipeline Transportation System GB/T 3091-2025 Welded steel pipes for low pressure fluid delivery GB 50236-2011 Code for construction and acceptance of field equipment, industrial pipe welding engineering GB/T 2829-2025 Sampling procedures and tables for periodic inspection by attributes(Apply to inspection of process stability)