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

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

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.
GB/T 19472.2-2017
GB
NATIONAL STANDARD OF THE
PEOPLE 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 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
Conduct the test according to GB/T 19466.6-2009. Samples shall be taken from the inner and outer walls of the pipe (excluding auxiliary support structures), with the original surface facing upwards for testing. The number of samples is 3, and the test result is the minimum value.
8.8 Density
Conduct the test according to GB/T 1033.1-2008. Adopt the immersion method. The sampling location is any place on the inner, outer wall or spigot end of the pipe (excluding auxiliary support structures).
8.9 Ring stiffness
Conduct the test according to GB/T 9647-2015. When the pipe DN/ID >500 mm, cut a sample from the pipe, rotate it 120?? and test it once; take the arithmetic mean of the three tests.
8.10 Impact performance
8.10.1 Conduct the test according to GB/T 14152-2001. The test temperature is 0 ??C ?? 1 ??C; the hammer model is d 90; the mass and impact height of the hammer are shown in Table 10.
10 Marking, transportation and storage
10.1 Marking
The product shall have at least the following permanent markings:
a) marking as specified in 5.2;
b) manufacturer?€?s name and/or trademark;
c) production date.
10.2 Transportation
10.2.1 Pipes and pipe fittings shall not be subject to severe impact, fall, or heavy pressure during loading, unloading, and transportation.
10.2.2 Pipes and pipe fittings with small diameter and light weight can be loaded and unloaded manually. Pipes and pipe fittings with larger diameters shall be loaded and unloaded mechanically. When pipes are mechanically loaded and unloaded, the two lifting points on the pipe shall be about 1/4 of the pipe length from both ends of the pipe.
10.2.3 The contact point between the bottom of the vehicle and ship and the pipes and fittings shall be as flat as possible, and measures shall be taken to prevent rolling and collision with each other. They shall not come into contact with sharp objects to avoid scratching the pipes and fittings.
10.3 Storage
The storage area for pipes and pipe fittings shall be flat and away from heat sources. For pipes and pipe fittings with a nominal size less than 2 m, the stacking height shall be less than 2 m; for pipes and pipe fittings with a nominal size greater than or equal to 2 m, the stacking height shall not exceed their outside diameter.
Appendix E
(Normative)
Sealing test method for elastic sealing ring joints
E.1 General
This Appendix specifies basic test methods for evaluating the sealing property of elastomeric seal-type joints in thermoplastic piping systems for underground usage. E.2 Test methods
E.2.1 Internal hydrostatic test
E.2.1.1 Principle
Use a sample assembled from pipes and/or fittings, plus a specified internal hydrostatic pressure P1, to evaluate its sealing property. If possible, then add a specified higher internal hydrostatic pressure P2 to evaluate the sealing property (see E.2.1.4.4). Each pressurization shall be maintained for a specified time, during which, the joints shall be checked for leaks (see E.2.1.4.5).
E.2.1.2 Equipment
E.2.1.2.1 End sealing device
Seal the non-connected ends of the assembled samples with appropriate dimensions and using appropriate sealing methods. The device is fastened in such a way that axial forces are not exerted on the joint.
E.2.1.2.2 Hydrostatic pressure source
Connected to a sealing device at one end, it is capable of exerting and maintaining specified pressure (see E.2.1.4.5).
E.2.1.2.3 Exhaust valve
Capable of venting gases from assembled samples.
E.2.1.2.4 Pressure measuring device
Capable of checking whether the test pressure meets the specified requirements (see E.2.1.4).
Note: To reduce the total amount of water used, a sealed tube or mandrel can be placed inside the sample.
E.2.1.3 Samples
The sample is assembled from one or more sections of pipe and/or one or several pipe fittings, containing at least one elastic sealing ring joint.
The joints being tested shall be assembled in accordance with the manufacturer?€?s requirements.
E.2.1.4 Procedure
E.2.1.4.1 The following steps are carried out at room temperature, using water at 23 ??C ?? 2 ??C.
E.2.1.4.2 Install the sample on the testing equipment.
E.2.1.4.3 When testing according to E.2.1.4.4 and E.2.1.4.5, observe whether the sample leaks. And note any leaks, if any, during and at the end of the test. E.2.1.4.4 Test pressure: P1 is 0.005 ?? (1??10%) MPa; P2 is 0.05+10% 0 MPa. E.2.1.4.5 Fill the assembled sample with water and exhaust the air. To ensure temperature consistency, pipes with a diameter Ee less than 400 mm shall be left for at least 5 minutes, and pipes with a diameter Ee greater than or equal to 400 mm shall be left for at least 15 minutes. Gradually increase the hydrostatic pressure to the specified test pressure P1 or P2 during a period of not less than 5 minutes, and maintain this pressure for at least 15 minutes, or until it is terminated early due to leakage. E.2.1.4.6 After completing the required pressure time, depressurize and drain the water in the sample.
E.2.2 Internal negative pressure test (partial vacuum)
E.2.2.1 Principle
Subject a sample assembled from several sections of pipe and/or several pipe fittings to a specified internal negative pressure (partial vacuum) for a specified period of time. During this period, evaluate the sealing property of the joint by detecting changes in pressure.
E.2.2.2 Equipment
The equipment (as shown in Figure E.1) shall comply with at least the equipment requirements specified in E.2.1.2.1 and E.2.1.2.4 and contain a source of negative air pressure and a pressure measuring device capable of determining the specified internal negative pressure (see E.2.2.4.3 and E.2.2.4.6).

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