GB/T 19472.2-2017 English PDF (GBT19472.2-2017)

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GB/T 19472.2-2017: Polyethylene structure-wall piping systems for underground usage -- Part 2: Polyethylene spirally enwound structure-wall pipes
GB/T 19472.2-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.140.30
G 33
Replacing GB/T 19472.2-2004
Polyethylene structure-wall piping systems for underground
usage - Part 2: Polyethylene spirally enwound structure-wall
pipes
ISSUED ON: DECEMBER 29, 2017
IMPLEMENTED ON: JULY 01, 2018
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms, definitions, symbols and abbreviated terms ... 6
4 Raw materials ... 10
5 Pipe classification and identification ... 11
6 Structure types and connection methods ... 11
7 Requirements ... 16
8 Test methods ... 22
9 Inspection rules ... 25
10 Marking, transportation and storage ... 27
Appendix A (Informative) Other characteristics of raw materials of PE pipes and pipe
fittings ... 28
Appendix B (Informative) Schematic diagram of typical pipe fittings ... 29
Appendix C (Informative) Schematic diagram of the connection methods of pipes and
pipe fittings ... 31
Appendix D (Normative) Preparation method of tensile test samples ... 34
Appendix E (Normative) Sealing test method for elastic sealing ring joints ... 37
References ... 45
Polyethylene structure-wall piping systems for underground
usage - Part 2: Polyethylene spirally enwound structure-wall
pipes
1 Scope
This Part of GB/T 19472 specifies the terms and definitions, symbols, abbreviations,
raw materials, pipe classification and identification, structure types and connection
methods, requirements, test methods, inspection rules, marking, transportation and
storage of polyethylene spirally enwound structure-wall pipes and pipe fittings for
underground usage.
This Part applies to structure-wall pipes and pipe fittings (or solid-wall pipe fittings)
processed by using polyethylene (PE) resin as the main raw material, and polyolefin
material as the auxiliary support structure, and using the winding molding process.
The pipes and pipe fittings specified in this Part are applicable to underground drainage,
sewage and other projects where the long-term operating temperature is below 45 °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 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 2828.1-2012, Sampling procedures for inspection by attributes - Part 1:
Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot
inspection
GB/T 2918-1998, Plastics - Standard atmospheres for conditioning and testing
GB/T 3682-2000, Determination of the melt mass-flow rate (MFR) and the melt
volume-flow rate (MVR) of thermoplastics
GB/T 6111-2003, Thermoplastics pipes for the conveyance of fluids - Resistance to
internal pressure - Test method
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 9345.1-2008, Plastics - Determination of ash - Part 1: General methods
GB/T 9647-2015, Thermoplastics pipes - Determination of ring stiffness
GB/T 14152-2001, Thermoplastics pipes - Determination of resistance to external
blows - Round-the-clock method
GB/T 18042-2000, Thermoplastics pipes - Determination of creep ratio
GB/T 19278-2003, General terms and their definitions of thermoplastic pipes,
fittings and valves
GB/T 19466.6-2009, Plastics - Differential scanning calorimetry (DSC) - Part 6:
Determination of oxidation induction time (isothermal OIT) and oxidation induction
temperature (dynamic OIT)
GB/T 21873-2008, Rubber seals - Joint rings for water supply drainage and sewerage
pipelines - Specification for materials
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
Terms and definitions determined by GB/T 19278-2003, and the following ones are
applicable to this document.
3.1.1
spirally enwound structure-wall pipes
Pipes made by using the filament winding process, with polyolefin material as an
auxiliary support structure.
3.1.2
pipe fittings
Products made by secondary processing from thermoformed parts and/or several pipe
sections (solid-wall pipes can be used).
3.1.3
8 Test methods
8.1 Pre-conditioning of samples
Unless otherwise specified, the samples shall be conditioned and tested in accordance
with the provisions of GB/T 2918-1998 at 23 °C ± 2 °C. The conditioning time shall
not be less than 24 h. When the pipe DN/ID >600 mm, the conditioning time shall be no
less than 48 h.
8.2 Color and appearance
By visual inspection, the interior can be illuminated by a light source.
8.3 Dimensions
8.3.1 Length
Measure according to GB/T 8806-2008.
8.3.2 Mean inside diameter
At the same cross-section of the pipe, measure the inside diameter of the pipe with a
measuring tool with an accuracy of not less than 1 mm. Measure once every 45°. Take
the arithmetic mean of the four measurement results and keep the result to one decimal
place.
8.3.3 Wall thickness
Divide the pipes and pipe fittings into four equal parts along the circumference, measure
the wall thickness with a measuring tool with an accuracy of not less than 0.02 mm, and
read the minimum value, accurate to 0.1 mm.
8.3.4 Weld length and joint length
Measure according to the measuring points L1 and L2 marked in Figure 5 and Figure 6.
The accuracy of the measuring tool shall not be less than 0.02 mm.
8.4 Longitudinal retraction rate
Conduct the test according to method B specified in GB/T 6671-2001. Cut three
sections of samples from different parts of a pipe, with a length of 200 mm ± 20 mm.
In case of pipe DN/ID < 400 mm, it can be cut into two test blocks of the same size
along the axial direction; in case of pipe DN/ID ≥ 400 mm, it can be cut into 4 (or more)
test blocks of the same size along the axial direction.
8.5 Oven test
8.5.1 Cut three sections of samples from different parts of a pipe, with a length of 300
mm ± 20 mm. In case of pipe DN/ID < 400 mm, it can be cut into two test blocks of the
same size along the axial direction; in case of pipe DN/ID ≥ 400 mm, it can be cut into
4 (or more) test blocks of the same size along the axial direction.
8.5.2 When the temperature of the oven is raised to 110 °C, put in the samples. The
samples shall not be in contact with each other or with the oven wall when placed. Start
timing when the oven temperature rises to 110 °C; maintain the oven temperature at
110 °C ± 2 °C. The heating time of the sample in the oven is as specified in the test
parameters in Table 6 and Table 8. After heating to the specified time, remove the
sample from the oven and cool to room temperature.
8.6 Ash
Conduct the test according to GB/T 9345.1-2008. Use the direct calcination method.
The sampling location is any place on the inner, outer wall or spigot end of the pipe
(excluding auxiliary support structures).
8.7 Oxidation induction time
Condu...