GB/T 29046-2023Detection methods of technical specification for pre-insulated district heating pipes (English PDF)

1 Scope

This document stipulates the appearance and structural dimensions of urban heating prefabricated insulated pipes, working pipes, insulation layers, outer protective pipes (layers), hot water insulation pipes,

Hot water insulation pipe joints, hot water insulation pipe fittings, hot water insulation pipe valves, insulation pipe signal lines, steam insulation pipes and joints, steam direct burial

Detection methods for thermal insulation pipe fittings and anti-corrosion coatings for external protective pipes of steam directly buried thermal insulation pipelines, as well as soil parameter testing, main testing equipment and instruments, and data

Processing and testing reports.

This document is applicable to the detection and evaluation of technical indicators of prefabricated hot water and steam insulation pipes, fittings and interfaces for urban heating.

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations

For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document.

GB/T 228.1 Tensile testing of metallic materials Part 1.Room temperature test methods

GB/T 241 Hydraulic test method for metal pipes

GB/T 699 High-quality carbon structural steel

GB/T 700 carbon structural steel

GB/T 1033.1 Determination of density of plastic non-foam plastics Part 1.Dip method, liquid pycnometer method and titration method

GB/T 1447 Test method for tensile properties of fiber reinforced plastics

GB/T 1449 Test method for bending properties of fiber reinforced plastics

GB/T 1463 Test methods for density and relative density of fiber reinforced plastics

GB/T 1549 Chemical analysis methods for fiber glass

GB/T 1766 Rating method for aging of paint and varnish coatings

GB/T 1839 Test method for quality of galvanized layer of steel products

GB/T 2406.2 Determination of combustion behavior of plastics by oxygen index method Part 2.Room temperature test

GB/T 2518 Continuous hot-dip galvanized and zinc alloy coated steel sheets and strips

GB/T 3087 Seamless steel pipes for low and medium pressure boilers

GB/T 3091 Welded steel pipes for low-pressure fluid transportation

GB/T 3280 Stainless steel cold-rolled steel plates and strips

GB/T 3682.1 Measurement of melt mass flow rate (MFR) and melt volume flow rate (MVR) of plastic thermoplastics

Set Part 1.Standard Methods

GB/T 3880.1 Aluminum and aluminum alloy plates and strips for general industrial use Part 1.General requirements

GB/T 3880.2 Aluminum and aluminum alloy plates and strips for general industrial use Part 2.Mechanical properties

GB/T 3880.3 Aluminum and aluminum alloy plates and strips for general industrial use Part 3.Dimensional deviations

GB/T 4336 Determination of multi-element content in carbon steel and medium-low alloy steel Spark discharge atomic emission spectrometry (conventional method)

GB/T 4956 Magnetic method for measuring the thickness of non-magnetic coatings on magnetic substrates

GB/T 5351 Pressure test method for short-term hydraulic failure of fiber-reinforced thermosetting plastic pipes […]