GB/T 37263-2018 Prefabricated directly buried insulating plastic-steel-plastic composite pipes with polyurethane(PUR) foamed-plastics and high density polyethylene(PE) casing pipes

GB/T 8923.1-2011 Preparation of steel substrates before application of paints and related products—Visual assessment of surface cleanliness—Part 1:Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coatings QB/T 2803 ISO 17455 GB/T 1033.1-2008 Plastics—Methods for determining the density of non-cellular plastics—Part 1:Immersion method,liquid pyknometer method and titration method GB/T 2918-1998 Plastics—Standard atmospheres for conditioning and testing GB/T 2918-2018 Plastics—Standard atmospheres for conditioning and testing GB/T 3524-1992 Hot-rolled cardon and low alloy structural steel strips GB/T 3524-2005 Hot-rolled carbon and low alloy structural steel strips GB/T 3524-2015 Hot-rolled carbon and low alloy structural steel strips GB/T 3682.1-2018 Plastics—Determination of the melt mass-flow rate(MFR)and melt volume-flow rate(MVR)of thermoplastics—Part 1:Standard method GB/T 6111-2003 Thermoplastics pipes for the conveyance of fluids-Resistance to internal pressure—Test method GB/T 6111-2018 Thermoplastics piping systems for the conveyance of fluids—Determination of the resistance to internal pressure GB/T 6343-1995 Cellular plastics and rubbers—Determination of apparent (bulk) density GB/T 6343-2009 Cellular plastics and rubbers—Determination of apparent density GB/T 6671-2001 Thermoplastics pipes-Determination of longitudinal reversion GB/T 8804.3-2003 Thermoplastic pipes—Determination of tensile properties—Part 3:Polyolefin pipes GB/T 8806-2008 Plastics piping systems—Plastics components—Determination of dimensions GB/T 8811-2008 Rigid cellular plastics—Test method for dimensional stability GB/T 8813-2008 Rigid cellular plastics—Determination of compression properties GB/T 8813-2020 Rigid cellular plastics—Determination of compression properties GB/T 10297-1998 Test method for thermal conductivity of nonmetal solid materials by hot-wire method GB/T 10297-2015 Test method for thermal conductivity of nonmetal solid materials—Hot-wire method GB/T 10799-1989 Cellular plastics—Determination of volume percentage of open and closed cells of rigid materials GB/T 10799-2008 Rigid cellular plastics—Determination of the volume percentage of open cells and of closed cells GB/T 15560-1995 Standard test method for short-time hydraulic failure and resistance to constant internal pressure of the plastics pipes for the transport of fluids GB/T 17391-1998 Test method for thermal stability of polyethylene pipes and fittings GB/T 18475-2001 Thermoplastics materials for pipes and fittings for pressure applications—Classification and designation—Overall Service(design) coefficient GB/T 28799.1-2012 Plastics piping systems for hot and cold water installations—Polyethylene of raised temperature resistance(PE-RT)—Part 1:General GB/T 28799.1-2020 Polyethylene of raised temperature resistance(PE-RT) piping systems for hot and cold water installations—Part 1:General GB/T 29046-2012 Test methods of technical specification for pre-insulated directly buried district heating pipes GB/T 29046-2023 Detection methods of technical specification for pre-insulated district heating pipes YB/T 5059-2013 Low carbon steel cold rolled steel sheet GB/T 8806-1988 Method for dimension measuring of plastic pipes YB/T 5059-2005 Cold-rolled low carbon steel strips