Standard No.:	GB/T 37263-2018
English Name:	Prefabricated directly buried insulating plastic-steel-plastic composite pipes with polyurethane(PUR) foamed-plastics and high density polyethylene(PE) casing pipes
Chinese Name:	高密度聚乙烯外护管聚氨酯发泡预制直埋保温钢塑复合管
Chinese Classification:	P46    Heat supply and heating engineering
Professional Classification:	GB    National Standard
ICS Classification:	91.140.10 91.140.10    Central heating systems 91.140.10
Issued by:	SAMR and SAC
Issued on:	2018-12-28
Implemented on:	2019-11-1
Status:	valid
Language:	English
File Format:	PDF
Word Count:	10500 words
Price(USD):	310.0
Delivery:	via email in 1 business day

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 1 Scope This standard specifies the terms and definitions, product construction, materials, requirements, test methods, inspection rules, marking, transportation and storage of prefabricated directly buried insulating plastic-steel-plastic composite pipes with polyurethane (PUR) foamed-plastics and high density polyethylene (PE) casing pipes. This standard is applicable to the manufacture and inspection of prefabricated directly buried insulating plastic-steel-plastic composite pipes with polyurethane (PUR) foamed-plastics and high density polyethylene (PE) casing pipes used in heating (cooling) and domestic hot water transportation system. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 1033.1 Plastics - Methods for determining the density of non-cellular plastics - Part 1: Immersion method, liquid pyknometer method and titration method GB/T 2918 Plastics - Standard atmospheres for conditioning and testing GB/T 3524 Hot-rolled carbon and low alloy structural steel strips GB/T 3682.1 Plastics - Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of thermoplastics - Part 1:Standard method GB/T 6111 Thermoplastics piping systems for the conveyance of fluids - Determination of the resistance to internal pressure GB/T 6343 Cellular plastics and rubbers - Determination of apparent density GB/T 6671 Thermoplastics pipes - Determination of longitudinal reversion GB/T 8804.3 Thermoplastic pipes - Determination of tensile properties - Part 3: Polyolefin pipes GB/T 8806 Plastics piping systems - Plastics components - Determination of dimensions GB/T 8811 Rigid cellular plastics - Test method for dimensional stability GB/T 8813 Rigid cellular plastics - Determination of compression properties 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 GB/T 10297 Test method for thermal conductivity of nonmetal solid materials - Hot-wire method GB/T 10799 Rigid cellular plastics - Determination of the volume percentage of open cells and of closed cells GB/T 15560 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 Test method for thermal stability of polyethylene pipes and fittings GB/T 18475 Thermoplastics materials for pipes and fittings for pressure applications - Classification and designation - Overall service (design) coefficient GB/T 28799.1 Plastics piping systems for hot and cold water installations - Polyethylene of raised temperature resistance (PE-RT) - Part 1: General GB/T 29046 Test methods of technical specification for pre-insulated directly buried district heating pipes QB/T 2803 Determination of deflection for rigid plastic pipes YB/T 5059 Cold-rolled low carbon steel strips ISO 17455 Plastics piping systems - Multylayer pipes - Determination of the oxygen permeability of the barrier pipe 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 insulating plastic-steel-plastic composite pipes prefabricated directly buried insulating pipes with the plastic-steel-plastic composite pipes formed by extrusion of heat-resistant polyethylene (PE-RT) and reinforced steel strip as the working pipe, polyurethane (PUR) foamed-plastics as the insulating layer, and high density polyethylene pipes as the outer protecting pipe 3.2 working pipe core tube in the insulating plastic-steel-plastic composite pipes which is used for conveying medium and formed by extrusion of heat-resistant polyethylene (PE-RT) as the base material and reinforced steel strip

1 Scope 2 Normative references 3 Terms and definitions 4 Product structure 5 Materials 6 Requirements 7 Test methods 8 Inspection rules 9 Marking, transportation and storage Annex A (Normative) Inspection methods for heat resistance of insulating layer