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GB/T 19472.1-2019: PDF in English (GBT 19472.1-2019) GB/T 19472.1-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.140.30
G 33
Replacing GB/T 19472.1-2004
Polyethylene structure wall pipeline system for underground
usage - Part 1: Polyethylene double wall corrugated pipes
ISSUED ON: AUGUST 30, 2019
IMPLEMENTED ON: MARCH 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions, symbols and abbreviations ... 6
4 Materials ... 10
5 Product classification and marking ... 10
6 Pipe structure and connection method ... 11
7 Requirements ... 13
8 Test methods ... 16
9 Inspection rules ... 19
10 Marking, transportation, storage ... 21
Appendix A (Informative) Performance requirements for elastic modulus and tensile
strength of raw materials ... 23
Appendix B (Informative) Flexural modulus and tensile yield strain properties of pipes
... 24
Appendix C (Normative) Sealing test method of elastic sealing ring ... 25
References ... 33
Polyethylene structure wall pipeline system for underground
usage - Part 1: Polyethylene double wall corrugated pipes
1 Scope
This Part of GB/T 19472 specifies the terms and definitions, symbols and abbreviations,
materials, product classification and marking, pipe structure and connection methods,
requirements, test methods, inspection rules and signs, transportation, storage of
polyethylene double wall corrugated pipes for underground usage.
This Part is applicable to pipes for buried drainage, sewage and communication sheath
pipes, whose long-term use temperature is below 45 °C. After evaluating the chemical
resistance and temperature resistance of the material, it can also be used for buried
industrial drainage and sewage pipes.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 1033.1-2008 Plastics - Methods for determining the density of non-cellular
plastics - Part 1: Immersion method, liquid pycnometer 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 2918-2018 Plastics - Standard atmospheres for conditioning and testing of
specimen
GB/T 3682.1-2018 Plastics - Determination of the melt mass-flow rate (MFR) and
melt volume-flow rate (MVR) of thermoplastics - Part 1: Standard method
GB/T 6111-2018 Thermoplastics piping systems for the conveyance of fluids -
Determination of the resistance to internal pressure
GB/T 8806-2008 Plastics piping systems - Determination of the size of plastic
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 19278-2018 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
ISO 13968:2008 Plastics piping and ducting systems - Thermoplastics pipes -
Determination of ring flexibility
3 Terms and definitions, symbols and abbreviations
3.1 Terms and definitions
The terms and definitions as defined in GB/T 19278-2018, as well as the following
terms and definitions, apply to this document.
3.1.1
Nominal size
DN
The nominal value of the dimension specification, which is usually the rounded
value for convenience.
[GB/T 19278-2018, definition 2.3.4]
3.1.2
Nominal size DN/OD
DN/OD
Nominal dimension, which is relative to outside diameter.
[GB/T 19278-2018, definition 2.3.5]
Nominal value of ring stiffness, which is usually a convenient round integer,
representing the minimum specified value of ring stiffness.
[GB/T 19278-2018, Definition 2.4.3]
3.2 Symbols
The following symbols apply to this document.
A: Joint length.
Dim,min: The minimum mean inside diameter of the socket.
DN: Nominal size.
DN/ID: Nominal size, which is expressed in inside diameter.
DN/OD: Nominal size, which is expressed in outside diameter.
de: Outside diameter.
dem: Mean outside diameter.
di: Inside diameter.
dim: Mean inside diameter.
e: Wall thickness of the inside layer (waterway wall thickness).
e1: Wall thickness of the inside layer under a hollow section.
e2: Wall thickness of a socket.
e3: Wall thickness of the outside layer under a hollow section.
L: Effective length of pipe.
SN: Nominal ring stiffness.
3.3 Abbreviations
The following abbreviations apply to this document.
MFR: Melt mass-flow rate
PE: Polyethylene
TIR: True impact rate
mean of the two inside diameters, as the mean inside diameter of the pipe.
8.3.4 Wall thickness
According to the provisions of GB/T 8806-2008, cut the pipe into four equal parts,
along the circumference; measure the wall thickness of the inside layer (waterway wall
thickness), the wall thickness of the inside layer under a hollow section, the wall
thickness of the outside layer under a hollow section; read the minimum value.
8.3.5 Mean inside diameter of socket
As shown in Figure 2, according to the provisions of GB/T 8806-2008, measure the two
inside diameters of the socket, that are perpendicular to each other; take the arithmetic
mean of the two inside diameters, as the measurement result.
8.3.6 Joint length
As shown in Figure 2, use a measuring tool, which has a minimum scale of not less than
0.02 mm, to measure the joint length.
8.3.7 Wall thickness of socket
Measure the wall thickness of the socket, according to the provisions of GB/T 8806-
2008; read the minimum value.
8.4 Ring stiffness
Carry out the test, according to the provisions of GB/T 9647-2015; the cutting point
shall be in the middle of the trough, when sampling.
8.5 Impact properties
8.5.1 Specimen
When the nominal size of the pipe is less than or equal to 500 mm, sampling shall be
carried out according to the provisions of GB/T 14152-2001. When the nominal size is
greater than 500 mm, it can be cut into pieces for testing. The size of the test block is
as follows: the length is (200 ± 10) mm; the inner chord length is (300 ± 10) mm; the
outer surface arc of the test block shall be upward; the two ends shall be placed
horizontally on the bottom plate; the impact point shall be guaranteed to be the top end
of corrugation.
8.5.2 Test procedure
The test is carried out, according to the provisions of GB/T 14152-2001. The test
temperature is (0 ± 1) °C; the V-shaped pallet is used. The mass of the drop weight and
the impact height are as shown in Table 8. When it is usually installed and laid at -10 °C,
in the planned use area, the mass of drop weight and impact height are as shown in
Observe whether the pipe specimen is broken; whether the inner and outer walls are
disengaged; whether the inner wall is reversely bent.
8.7 Oven test
8.7.1 Specimen
Take 3 segments of pipes of (300 ± 20) mm long. For pipes, which have a nominal size
≤ 400 mm, cut into two specimens of the same size, along the axial direction. For pipes,
which have a nominal size > 400 mm, cut into four specimens of the same size, along
the axial direction.
8.7.2 Test procedure
Set the oven temperature to (110 ± 2) °C. After the temperature is reached, place the
specimen in the oven, so that it does not contact each other AND the four walls of the
oven. When the wall thickness of the inside layer (waterway wall thickness) e is ≤ 8
mm, place it at (110 ± 2) °C for 30 min; when the wall thickness of the inside layer
(waterway wall thickness) e is > 8 mm, place it at the same temperature for 60 min. Do
not deform or damage it, when taking it out. Cool it to room temperature; observe it. If
the specimen is delaminated, cracked or blistered, the specimen is unqualified.
8.8 Density
The test is carried out, according to the provisions of Method A in GB/T 1033.1-2008.
The inner and outer walls are measured, respectively. Take the maximum value.
8.9 Oxidative induction time
The test is carried out, according to the provisions of GB/T 19466.6-2009. The inner
and outer walls are measured, respectively. Take the minimum value.
8.10 Creep ratio
The test is carried out, according to the provisions of GB/T 18042-2000. The test
conditions are (23 ± 2) °C; the creep ratio is calculated and extrapolated to two years.
8.11 Suitability of the system
Follow the provisions of Appendix C.
9 Inspection rules
9.1 Group-batching
The pipes of the same batch of raw materials, the same formula, the same specification,
which are produced under the same conditions, form a batch. When the nominal size of
a) Trial type identification of new products or old products after trans-plant
production;
b) When there are major changes in structure, material, process, that may affect the
performance of the product;
c) When the production resumes after suspension for more than one year;
d) Where there is a big difference, between the exit-factory inspection results and
the last type inspection results.
9.4 Judgment rules
If any of the items in 7.1, 7.2, 7.3 do not meet the requirements of Table 10, except the
wall thickness of the inside layer (waterway wall thickness), the wall thickness of the
inside layer under a hollow section, the wall thickness of the outside layer under a
hollow section, THEN, the batch is judged to be unqualified. If any of the items of the
wall thickness of the inside layer (waterway wall thickness), the wall thickness of the
inside layer under a hollow section, the wall thickness of the outside layer under a
hollow section in 7.3, as well as the ring stiffness, ring flexibility, oven test in 7.4, fail
to meet the index, THEN, in the qualified samples as taken in accordance with the
sampling plan in 9.2.2, re-take double quantity of samples for reinspection of such item;
if it is still unqualified, this batch is unqualified.
10 Marking, transportation, storage
10.1 Marking
10.1.1 There shall be the following permanent markings on the product:
a) The marks according to 5.2;
b) The name and trademark of the manufacturer;
c) Pipes, that can be installed and laid at -10 °C, shall be marked with an ice crystal
(*) symbol.
10.1.2 The date of manufacture shall be marked on the product.
10.2 Transportation
When the product is loaded, unloaded, transported, it shall not be subjected to severe
impact, throwing, high pressure.
10.3 Storage
The pipe storage site shall be flat; the stacking shall be neat; the stacking height shall
Appendix C
(Normative)
Sealing test method of elastic sealing ring
C.1 Overview
This Appendix specifies three basic test methods for evaluating the sealing performance
of elastic sealing ring type joints, in buried thermoplastic piping systems, under selected
test conditions.
C.2 Classification of test methods
C.2.1 General
The test methods are divided into the following three types:
- Method 1: Evaluate sealing performance, by the use of lower internal hydrostatic
pressure;
- Method 2: Evaluate sealing performance, by the use of higher internal hydrostatic
pressure;
- Method 3: Internal negative air pressure (partial vacuum).
C.2.2 Internal hydrostatic test
C.2.2.1 Principle
On the specimen, which is assembled by pipe and (or) pipe fittings, apply a specified
internal static pressure p1 (method 1), to evaluate its sealing performance. If possible,
then add a specified internal static pressure p2 (method 2), to evaluate its sealing
performance (see C.2.2.4.4).
The test pressure shall be maintained for a specified time, during which it shall check
the joint for leakage (see C.2.2.4.5).
C.2.2.2 Equipment
C.2.2.2.1 End seals
Seal the non-connected ends of the assembled specimens, through appropriate
dimensions and appropriate sealing method. The device is fixed in such a way, that no
axial forces can be created on the joint.
C.2.2.2.2 Hydrostatic source
Connect to one end of the sealing device. It can apply and maintain the specified
pressure (see C.2.2.4.5).
C.2.2.2.3 Exhaust valve
It is capable of venting gas, from assembled specimen.
C.2.2.2.4 Pressure measuring device
It can check whether the test pressure meets the specified requirements (see C.2.2.4).
Note: To reduce the total volume of water used, a sealed tube or mandrel can be placed in the
specimen.
C.2.2.3 Specimen
The specimen is assembled from one or several segments of pipe and (or) one or more
pipe fittings, with at least one elastic sealing ring joint. The joint to be tested shall be
assembled, in accordance with the manufacturer's requirements.
C.2.2.4 Procedure
C.2.2.4.1 Water temperature
The test water temperature is (23 ± 2) °C.
C.2.2.4.2 Installation
Install the specimen on the test equipment.
C.2.2.4.3 Test record
During the test according to C.2.2.4.4 and C.2.2.4.5, observe whether the specimen
leaks. Record any leakage or non-leakage, during and at the end of the test.
C.2.2.4.4 Test pressure
Select the test pressure as follows:
- Method 1: The lower internal hydrostatic test pressure, p1, is 0.005 MPa (1±10%);
- Method 2: The higher internal hydrostatic test pressure, p2, is 0.05 MPa ( ).
C.2.2.4.5 Test method
Fill the assembled specimen with water. Discharge the air. In order to ensure the
pipe fittings, with at least one elastic sealing ring joint. The joint to be tested shall be
assembled, in accordance with the manufacturer's requirements.
C.2.3.4 Procedure
C.2.3.4.1 Water temperature
The following steps are carried out, within the range of the ambient temperature (23 ±
2) °C. When the test is performed in accordance with C.2.3.4.5, the temperature change
shall not exceed 2 °C.
C.2.3.4.2 Installation
Install the specimen on the test equipment.
C.2.3.4.3 Test pressure
Choose the test pressure, from the following methods:
- Method 3: The internal negative air pressure (partial vacuum)'s test pressure p3 is -
0.03 MPa (1 ± 5%).
C.2.3.4.4 Initial air pressure
Subject the specimen to an initial negative air pressure, p3, as specified in C.2.3.4.3.
C.2.3.4.5 Test method
Isolate the negative gas source from the specimen. Measure the internal negative
pressure. Determine and record the loss of partial vacuum, after 15 min.
C.2.3.4.6 Test record
Record whether the loss of partial vacuum exceeds the specified requirements of the
internal negative pressure p3.
C.3 Test conditions
C.3.1 General
The test conditions are divided into the following three types:
- Condition A: There is no additional deformation or angular deviation;
- Condition B: There is radial deformation;
- Condition C: There is angular deviation.
C.3.2 Condition A: There is no additional deformation or angular deviation
When a specimen, which is assembled from one or several segments of pipe and/or one
or more pipe fittings, is tested, it does not have any stress acting on the joint, due to
deformation or deviation, respectively.
C.3.3 Condition B: Radial deformation
C.3.3.1 Principle
Before carrying out the required pressure test, the specimen which is assembled from
pipe and/or pipe fittings have been subjected to the specified radial deformation.
C.3.3.2 Equipment
The equipment shall be capable of producing a constant radial deformation, at the same
time on the pipe and additionally at the connection seal, increasing the internal
hydrostatic pressure (see Figure C.2), which shall comply with C.2.2.2 and C.2.3.2:
a) A mechanical or hydraulic device, acting on the pressure block, that moves freely
along the vertical plane, which is perpendicular to the axis of the pipe, to produce
the necessary radial deformation of the pipe (see C.3.3.3). For pipes, which have
a diameter equal to or greater than 400 mm, each pair of pressure blocks shall be
oval, to suit the expected shape, when the pipe is deformed to the required value,
OR be equipped with flexible belts or rubber pads, that can be adapted to the
shape of the deformed pipe.
The width of the pressing block is b1, which is specified as follows, according to
the outside diameter of the pipe:
• When de ≤ 710 mm, b1 = 100 mm;
• When 710 mm < de ≤ 1000 mm, b1 = 150 mm;
• When de > 1000 mm, b1 = 200 mm.
The distance 1, between the socket end and the pressure block shall be 0.5de or
100 mm, whichever is greater.
For double-wall corrugated pipe, the pressure block shall cover at least two
corrugations.
b) A mechanical or hydraulic device, acting on the pressure block, that moves freely
along the vertical plane, which is perpendicular to the axis of the pipe, to produce
the necessary radial deformation, at the connection seal (see C.3.3.3).
The width b2 of the pressure block shall be specified as follows, according to the
outside diameter de of the pipe:
• When de ≤ 110 mm, b2 = 30 mm;
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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