GB/T 6111-2003 English PDF (GBT6111-2003)

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GB/T 6111-2003: Thermoplastics pipes for the conveyance of fluids -- Resistance to internal pressure -- Test method
GB/T 6111-2003
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.040.20
G 33
Replacing GB/T 6111-1985
Thermoplastics pipes for the
conveyance of fluids - Resistance
to internal pressure - Test method
(ISO 1167.1996, IDT)
ISSUED ON. MARCH 5, 2003
IMPLEMENTED ON. AUGUST 1, 2003
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People’s Republic of China
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Definitions ... 4
4 Principle ... 5
5 Test parameters ... 5
6 Test apparatus ... 5
7 Test pieces ... 8
8 Calibration of the apparatus and calculation of the test pressure ... 9
9 Conditioning ... 9
10 Test procedure ... 10
11 Test report ... 11
Annex A (informative) Basic specifications ... 13
Foreword
This Standard is identical to ISO 1167.1996 “Thermoplastics pipes for the conveyance
of fluids - Resistance to internal pressure - Test method” (English version). The
technical content is the same and the preparation method is identical, only editorial
modifications in the text are made.
This Standard replaces GB/T 6111-1985 “Standard test method for time-to-failure of
thermoplastic pipe under constant internal pressure”.
Compared with GB/T 6111-1985, this Standard has the following main changes.
1. CHANGE the standard name from the “Standard test method for time-to-failure of
thermoplastic pipe under constant internal pressure” TO “Thermoplastics pipes for
the conveyance of fluids - Resistance to internal pressure - Test method”.
2. ADD the clause of test parameters.
3. IMPROVE the accuracy requirements for test apparatus.
4. DELETE type C end caps; describe the other two types of end caps in detail.
5. CHANGE the number of test pieces to 3 and specify the length of test pieces.
6. SPECIFY the method and duration of conditioning of test pieces.
7. SPECIFY the treatment method for different test phenomenon during the test
process.
8. ADD the informative Annex A.
This Standard replaces GB/T 6111-1985 from the date of implementation.
Annex A of this Standard is informative.
This Standard is proposed by China Light Industry Federation.
This Standard is under the jurisdiction of National Technical Committee on Plastics of
Standardization Administration of China (TC 48).
Drafting organizations of this Standard. Zhejiang Yonggao Plastic Industry
Development Co., Ltd., Hebei Baoshuo Pipe Co., Ltd.
Main drafters of this Standard. Huang Jian, Zhao Zhijie, Xu Xuecheng, Wang Shuhua,
Jiao Cuiyun.
Thermoplastics pipes for the conveyance of fluids -
Resistance to internal pressure -Test method
1 Scope
This Standard specifies a method for determination of the resistance of thermoplastics
pipes to constant internal water pressure at constant temperature.
This Standard is applicable to thermoplastics pipes intended for the conveyance of
fluids.
2 Normative references
The following standards contain provisions which, through reference in this text,
constitute provisions of this Standard. At the time of publication, the editions indicated
were valid. All standards are subject to revision, and parties to agreements based on
this Standard are encouraged to investigate the possibility of applying the most recent
editions of the standards indicated below.
GB/T 4117-2001 Thermoplastics pipes for the conveyance of fluids - Nominal
outside diameters and nominal pressures (idt ISO 161-1.1996)
GB/T 8806-1988 Method for dimension measuring of plastic pipes (eqv ISO
3126.1974)
GB/T 18252-2000 Plastics piping and ducting systems - Determination of the long-
term hydrostatic strength of thermoplastics materials in pipe form by extrapolation
NOTE. GB/T 18252-2000 “Plastics piping and ducting systems - Determination of the long-
term hydrostatic strength of thermoplastics materials in pipe form by extrapolation” is
developed referring ISO/DIS 9080.1997 “Thermoplastics pipes for the transport of fluids -
Methods of extrapolation of hydrostatic stress rupture data to determine the long-term
hydrostatic strength of thermoplastics pipe materials”, so the technical content of this
standard is identical to ISO/DIS 9080.1997. ISO/DIS 9080.1997 is the revision to ISO/TR
9080.
3 Definitions
For the purposes of this Standard, the definitions given in GB/T 4217-2001 apply.
4 Principle
After conditioning, test pieces are subjected to a specified constant internal hydrostatic
pressure to a specified period of time or until failure.
Throughout the test, the test pieces are kept in an environment at a specified constant
temperature. this is water (“water-in-water” test), another liquid (“water-in-liquid” test)
or air (“water-in-air” test).
5 Test parameters
The following test parameters are set by the standard making reference to this
Standard.
a) the type of end cap to be used (see 6.1);
b) the size and S-series of pipe to be used (see 7.1);
c) the test temperature (see 6.2 and 10.1);
d) for pipes of nominal outside diameter dn greater than 315 mm, the free length of
the test piece, if other than 1 000 mm (see 7.1.1);
e) the number of test pieces (see 7.2);
f) the test pressure p or the hoop stress σ to be induced by the test pressure (see
8.2.2);
g) the conditioning period (see clause 9), if other than as specified in table 1;
h) the type of test, i.e. water-in-water/air/liquid (see clause 4 and 10.1);
i) the duration of the test under pressure and the criteria for a failure (see 10.3);
j) the requirements for additional testing.
6 Test apparatus
6.1 End caps
End caps are fitted on two ends of the test pieces. By means of an appropriate system,
end caps shall allow sealing and connection to the pressurizing equipment. The end
cap shall be of one of the following types.
Type A. Fittings rigidly connected to the test piece but not to each other, and hence
Capable of checking conformity to the specified test pressure. In the case of gauges
or similar calibrated pressure measurement devices, the range of the gauge shall be
such that the required pressure setting lies within the calibrated range of the device
used.
The pressure measurement devices shall not contaminate the test fluid.
The use of master gauges for calibration of the apparatus is recommended.
6.6 Thermometer or equivalent
Capable of checking conformity to the specified test temperature.
6.7 Timer
Timer shall capable of recording the duration of the pressure applications up to the
moment of failure or leakage.
NOTE. It is recommended that equipment be used which is sensitive to pressure variations due
to leaks or a failure and which is capable of stopping the timer and, if necessary, closing the
pressure circuit for the test piece concerned.
6.8 Means of measuring the wall thickness
Conforming to GB/T 8806-1988.
NOTE. A calibrated ultrasonic measuring device can be used.
6.9 Means of measuring the mean outside diameter of the pipe
Conforming to GB/T 8806-1988, e.g. a metal tape.
7 Test pieces
7.1 Dimensions
7.1.1 Free length
The free length L0 (as shown in Figure 1) of each test piece between the end caps
shall be at least three times the outside diameter for pipes with a nominal outside
diameter dn less than or equal to 315 mm, with a minimum of 250 mm. For pipes with
a nominal outside diameter dn greater than 315 mm, a minimum free length L0 of
greater than or equal to 1 000 mm shall...