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