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GB/T 23658-2009 English PDF (GBT23658-2009)

GB/T 23658-2009 English PDF (GBT23658-2009)

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GB/T 23658-2009: Elastomer seals transport gas and hydrocarbon liquids in pipes and fittings with seal material requirements

This standard specifies the requirements for the delivery pipes and fittings, auxiliary devices, and elastomeric seals materials for the valves used for the following conditions which have a normal working temperature of -5 ~ +50 degree-Celcius and -15 ~ +50 degree-Celcius under special circumstances:
GB/T 23658-2009
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 83.140.50
G 43
Elastomeric seals - Material requirement
for seals used in pipes and fittings
carrying gaseous fuels and hydrocarbon fluid
(ISO 16010.2005, MOD)
ISSUED ON. APRIL 24, 2009
IMPLEMENTED ON. DECEMBER 01, 2009
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 .. 5
2 Normative references .. 6
3 Classification .. 7
4 Requirements .. 7
5 Specimen and temperature .. 12
6 Quality assurance .. 12
7 Storage .. 13
8 Identification code .. 13
9 Markings and labels .. 13
Appendix A (Informative) Quality assurance .. 15
Appendix B (Informative) Seal storage guidance . 16
Foreword
This standard, through modification, uses the ISO 16010.2005 ?€?Elastomeric seals - Material requirement for seals used in pipes and fittings carrying gaseous fuels and hydrocarbon fluid?€? (in English).
This standard was redrafted in accordance with ISO 16010.2005.
Due to the special needs of our country's industry, this standard has been modified when adopting international standards. These technical differences are marked by vertical single lines in the margins of the clauses to which they relate. The main technical differences with ISO 16010.2005 are.
- GB/T1690-1992 in Chapter 2 Normative references adopts non-
equivalently the corresponding international standards.
- CHANGE the note to clause 4.2.3 ?€?If the seal is appropriate in size, it may use the routine test method as specified in GB/T 6031-1998, but it must use the micro-test method as reference?€? into ?€?If the seal is appropriate in size, it may use the routine test method as specified in GB/T 6031?€?, because if measuring the micro-hardness after measuring the routine hardness, it will increase the test burden, which is not necessary.
- In clause 4.2.6, the aging chamber used in the hot air aging test is different from that of ISO 16010.2005. ISO 16010.2005 adopts the method A of ISO
188, which uses a low-speed air circulation aging chamber; however, in
order to meet the actual conditions in China, the hot air aging test makes reference to GB/T3512, which equivalently uses the method B of ISO 188, selecting the forced air circulation aging chamber.
For ease of use, this standard also makes the following editorial changes. - CHANGE ?€?this international standard?€? into ?€?this standard?€?;
- DELETE the foreword of international standards.
Appendix A and Appendix B of this standard are informative.
This standard was proposed by China Petroleum and Chemical Industry
Association.
This standard shall be under the jurisdiction of the National Sealing Products Subcommittee of the National Rubber and Rubber Products Standardization Technical Committee (SAC/TC 35/SC 3).
Elastomeric seals - Material requirement
for seals used in pipes and fittings
carrying gaseous fuels and hydrocarbon fluid
1 Scope
This standard specifies the requirements for the delivery pipes and fittings, auxiliary devices, and elastomeric seals materials for the valves used for the following conditions which have a normal working temperature of -5 ??C ~ +50 ??C and -15 ??C ~ +50 ??C under special circumstances.
a) General circumstances (see Table 4, type G series).
- Gas fuels [artificial gas, natural gas and gas-phase liquefied petroleum gas (LPG)];
- Hydrocarbon liquid having aromatic content (volume fraction) less than 30%, including liquid LPG;
b) Special circumstances (see Table 4, type H). Suitable for conveying
compressed gas fuels and hydrocarbon liquids, which has an aromatic
content (volume fraction) of more than 30%.
This standard also stipulates general requirements for the finished product seal. The additional requirements for special applications shall be specified in the corresponding product standards. It shall be noted that the performance of the pipe joint is related to the properties of the seal material, the geometry of the seal, and the structure of the pipe joint. If applicable, this standard should be used in conjunction with product standards that specify the performance of the pipe joint.
This standard applies to all pipe joints seals, including cast iron pipes, steel pipes, copper pipes and plastic pipes.
For composite seals, the requirements of 4.2.8 and 4.2.9 apply only to
elastomer parts in contact with gaseous fuels or hydrocarbon liquids.
For materials with hardness grades of 80 and 90, elongation at break,
compression set, and compressive stress relaxation requirements apply only when the rubber is directly involved in the seal or when the seal is required to be stable over a long period of time.
This standard does not apply to the following occasions.
- The seal made of porous material;
- The seal containing closed-cell material in the structure;
- The seal requiring flame or heat-resistant stress;
- A jointed seal formed by joining the ends of precured profiles.
2 Normative references
The provisions in following documents become the provisions of this Standard through reference in this Standard. For the dated references, the subsequent amendments (excluding corrections) or revisions do not apply to this Standard; however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies. GB/T 528 Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties (GB/T 528-1998, eqv ISO 37.1994)
GB/T 1685 Rubber, vulcanized or thermoplastic - Determination of stress relaxation in compression at ambient and at elevated temperatures (GB/T 1685-2008, ISO 3384.2005, MOD)
GB/T 1690-1992 Rubber, vulcanized - Determination of the effect of liquids (neq ISO 1817.1985)
GB/T 2941-2006 Rubber - General procedures for preparing and
conditioning test pieces for physical test methods (ISO 23529.2004, IDT) GB/T 3512 Rubber, vulcanized or thermoplastic - Accelerated ageing and
heat resistance tests - Air-oven method (GB/T 3512-2001, eqv ISO 188.1998) GB/T 3672.1 Rubber - Tolerances of products - Part 1. Dimensional
tolerances (GB/T 3672.1-2002, ISO 3302-1.1996, IDT)
GB/T 6031 Rubber, vulcanized or thermoplastic-Determination of hardness (hardness between 10 IRHD and 100 IRHD) (GB/T 6031-1998, idt ISO
48.1994)
GB/T 7759 Rubber, vulcanized or thermoplastic - Determination of
compression set at ambient elevated or low temperatures (GB/T 7759-1996, eqv ISO 815.1991)
GB/T 7762 Rubber, vulcanized or thermoplastic - Resistance to ozone
4.2.6 Accelerated aging in the air
The test specimen for hardness determination (as shown in 4.2.3) and the test specimen for tensile strength and elongation at break (as shown in 4.2.4) shall be aged in hot air at 70 ??C for 7 days as specified in GB/T 3512.
The change in hardness, rate of change in tensile strength, and rate of change in elongation at break shall be in accordance with Table 2 or Table 3.
4.2.7 Compression stress relaxation
Compression stress relaxation shall be measured in accordance with the
method specified in GB/T 1685 using Type II specimens.
For the 7 d test, it shall record the measurement values for 3 h, 1 d, 3 d, and 7 d; for the 90 d test, it shall record the measurement values for 3 h, 1 d, 3 d, 7 d, 30 d, and 90 d.
The logarithmic time coordinates are used to draw the best-fit straight line through the regression analysis method. The correlation coefficient derived from these analyses for the 7-day test shall not be lower than 0.93. For the 90- day test, the correlation coefficient shall not be lower than 0.83. The 7-day and 90-day compressive stress relaxation requirements in Tables 2 and 3 are derived from this straight line.
The compressive stress relaxation at the following temperatures and times shall comply with the requirements of Table 2 and Table 3.
- 7 d at (23 ?? 2) ??C;
- 90 d at (23 ?? 2) ??C.
The 90-day test shall be regarded as a stereotypical test.
If the specimen is made from a seal, it shall be measured as far as possible in the direction of compression when the seal is in operation.
4.2.8 Volume changes in liquid B
When measured in accordance with the method specified in GB/T 1690-1992, it is first soaked in liquid B at 23 ??C for 7 days, and then dried in air at 70 ??C for 4 days, the volume change shall meet the requirements specified in Table 2 or Table 3.
4.2.9 Volume changes in oil
In accordance with the method specified in GB/T 1690-1992, it is determined after soaking for 7 days in standard oil No.3 at 70 ??C, the volume change shall Appendix A
(Informative)
Quality assurance
A.1 Type test
Except for those tests where the test period exceeds 28 days, the rest of the tests shall be performed at least once a year or when the manufacturing process is changed. For tests with a test period longer than 28 days, they shall be repeated every five years. All tests (without exception) shall also be carried out at the beginning and when major changes occur in the rubber formulation. A.2 Product control test
It is recommended to carry out the tests required by 4.2.1 and 4.2.2 and use the test specimens prepared in accordance with 5.1 to perform the following tests.
a) Hardness;
b) Tensile strength;
c) Elongation at break;
d) Compression set at 70 ??C, 24 h.
A.3 Sampling for product control test
The control test of the product should be carried out on each batch of seals and the following sampling procedures shall be used.
a) For the counting test...

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