GB/T 32439-2015 English PDF (GBT32439-2015)

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GB/T 32439-2015: Cross helically wound steel wires reinforced-polyethylene composite pipelines for water supply
GB/T 32439-2015
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.140.30
G 33
Cross helically wound steel wires reinforced-polyethylene
composite pipelines for water supply
ISSUED ON: DECEMBER 31, 2015
IMPLEMENTED ON: JULY 01, 2016
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 Materials ... 7
5 General ... 9
6 Requirements ... 11
7 Test methods ... 20
8 Inspection rules ... 22
9 Marks, packaging, transportation and storage ... 25
Annex A (informative) Shear strength test of adhesive resin and steel wire ... 28
Annex B (normative) Preparation method for peel strength test sample ... 30
Cross helically wound steel wires reinforced-polyethylene
composite pipelines for water supply
1 Scope
This Standard specifies the terms and definitions, materials, requirements, test methods,
inspection rules and marks, packaging, transportation, storage for cross helically wound
steel wires reinforced-polyethylene composite pipes (hereinafter referred to as pipes)
and pipe fittings.
This Standard is applicable to cross helically wound steel wires reinforced-polyethylene
composite pipelines for water supply whose temperature of the conveying medium does
not exceed 40°C.
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 228.1, Metallic materials - Tensile testing - Part 1: Method of test at room
temperature
GB 912, Hot-rolled sheets and strips of carbon structural steels and high strength
low alloy structural steels
GB/T 1033.1, Plastics - Methods for determining the density of non-cellular plastics
- Part 1: Immersion method, liquid pycnometer method and titration method
GB/T 1040.1, Plastics - Determination of tensile properties - Part 1: General
principles
GB/T 1040.2, Plastics - Determination of tensile properties - Part 2: Test conditions
for moulding and extrusion plastics
GB/T 1633-2000, Plastics - Thermoplastic materials. Determination of Vicat
softening temperature (VST)
GB/T 1844.1-2008, Plastics - Symbols and abbreviated terms - Part 1: Basic
polymers and their special characteristics
GB/T 2035-2008, Terms and definitions for plastics
GB/T 2790, Adhesives, 180-degree peel strength test method for a flexible-bonded-
to-rigid test specimen assembly
GB/T 2791, Adhesives, T peel strength test method for a flexible-to-flexible test
specimen assembly
GB/T 2828.1, Sampling procedures for inspection by attributes - Part 1: Sampling
schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
GB/T 2918, Plastics - Standard atmospheres for conditioning and testing
GB/T 3682, Determination of the melt mass-flow rate (MFR) and the melt volume-
flow rate (MVR) of thermoplastics
GB/T 6111, Thermoplastics piping systems for the conveyance of fluids -
Determination of the resistance to internal pressure
GB/T 8806, Plastics piping systems - Plastics components - Determination of
dimensions
GB/T 11253, Cold-rolled sheet and strip of carbon structural steels
GB/T 13663-2000, Polyethylene pipes (PE) for water supply
GB/T 13663.2-2005, Polyethylene (PE) piping systems for water supply - Part 2:
Fittings
GB/T 14450, Bead wire
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 17219, Standard for safety evaluation of equipment and protective materials
in drinking water system
GB/T 19278, General terms and their definitions of thermoplastic pipes, fittings and
valves
GB/T 19466.6, Plastics - Differential scanning calorimetry (DSC) - Part 6:
Determination of oxidation induction time (isothermal OIT) and oxidation induction
temperature (dynamic OIT)
CJ/T 124, Fittings of steel reinforced polyethylene plastic pipes for water supply
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 19278,
GB/T 13663-2000, GB/T 13663.2-2005, GB/T 1844.1-2008 and GB/T 2035-2008 as
materials (including plastics, steel, aluminum, copper and other metal materials and
non-metal materials) together.
3.5 nominal pressure; PN
Reference values relating to the pressure resistance of piping system components. For
ease of use, the priority number of the R10 series is usually taken.
[GB/ T19278-2003, the term 6.12 related to product performance]
4 Materials
4.1 Polyethylene
4.1.1 Basic performance
The properties of polyethylene materials for pipes and pipe fittings shall meet the
requirements of special materials for polyethylene pipes of grade PE80 and above in
GB/T 13663-2000.
4.1.2 Recycled material
It is allowed to use a small amount of clean regrind of the same designation from our
factory to produce the same product. The produced pipes or fittings shall meet the
requirements of this Standard.
External salvage, regrind shall not be used.
4.2 Steel wire
4.2.1 Appearance
The surface of the steel wire shall be free from oil, rust, dirt and other dirt. There shall
be no damage, no indentation and other defects that are harmful to use.
4.2.2 Diameter and allowable deviation
The nominal diameter, allowable deviation and out-of-roundness of steel wire shall
comply with the provisions of GB/T 14450.
4.2.3 Mechanical properties
The tensile strength and elongation at break of the steel wire shall meet the requirements
in Table 1. The number of one-way twists shall comply with the provisions of GB/T
14450.
6 Requirements
6.1 Color
Color of pipe: it shall be black with blue color stripes, but the adhesive resin layer shall
be white, natural or transparent.
Color of fitting: it shall be black.
6.2 Appearance
6.2.1 The inner and outer surfaces of the pipes shall be clean and smooth. Defects such
as bubbles, obvious scratches, dents, impurities, and uneven colors are not allowed.
6.2.2 The pipe ends shall be cut flat and perpendicular to the pipe axis. The ends shall
be capped.
6.2.3 The inner and outer surfaces of pipe fittings shall be clean and smooth. Shrinkage
cavities (pits), obvious scratches, impurities, uneven color and other surface defects are
not allowed.
6.3 Resistance deviation of electrofusion fittings
It shall meet the provisions of 6.3 in GB/T 13663.2-2005.
6.4 Specification and size of pipe
6.4.1 Specifications and sizes of pipes with different pressure levels
The nominal outer diameter, average outer diameter and allowable deviation of the pipe,
the minimum wall thickness of the outer layer of polyethylene, the minimum nominal
diameter of the steel wire, and the value range of the wall thickness at any point shall
meet the requirements of Table 5.
7.4 Specification and size
They shall comply with the provisions of GB/T 8806.
7.5 Hydrostatic strength and burst pressure
7.5. Pipes
The hydrostatic strength test of the pipe shall comply with the provisions of GB/T 6111.
The burst pressure test shall comply with the provisions of GB/T 15560.
7.5.2 Polyethylene pip...