GB/T 24721.3-2023Glass fiber reinforced plastic product for highway—Part 3:Duct (English PDF)
公路用玻璃纤维增强塑料产品 第3部分：管道
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
March 17, 2023
Implementation date
July 1, 2023
Scope
GB/T 24721.3-2023 is the English-translated version of 公路用玻璃纤维增强塑料产品 第3部分：管道.
GB/T 24721.3-2023 is Part 3 of GB/T 24721 and covers glass fibre reinforced plastic duct for highways: product classification, structures, dimensions and deviations, model designation, technical requirements, test methods, inspection rules, marking, packaging, transport and storage.
It applies to the production, inspection and use of rolled, pultruded and wound glass fibre reinforced duct.
The test clause sets out how to measure wall thickness, socket inner diameter, length and deflection, and how to check appearance, tensile and flexural strength, density, Barcol hardness, load deformation temperature, the static friction coefficient of the inner wall, duct rigidity, resistance to drop hammer impact, flame retardancy, water resistance and resistance to chemical media.
It cites GB/T 1458, GB/T 5352, GB/T 14152 and QB/T 2803. It replaces GB/T 24721.3-2009, was issued on 17 March 2023 and has applied since 1 July 2023.
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Document preview — GB/T 24721.3-2023
National Standard of the People's Republic of China
- ICS
- 03.220.20
- Classification
- P 66
- Replacing
- GB/T 24721.3-2009
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- Introduction5
- 1 Scope6
- 2 Normative References6
- 3 Terms and Definitions6
- 4 Product Classification, Structures, Dimensions, Deviations and Model7
- 5 Technical Requirements9
- 6 Test Methods10
- 7 Inspection Rules13
- 8 Marking, Packaging, Transportation and Storage13
Foreword
This document was drafted in accordance with the rules provided in GB/T 1.1-2020 Directives for Standardization - Part 1: Rules for the Structure and Drafting of Standardizing Documents.
This document is Part 3 of GB/T 24721 Glass Fiber Reinforced Plastic Product for Highway.
GB/T 24721 has issued the following parts:
---Part 1: General Rule;
---Part 2: Trunk;
---Part 3: Duct;
---Part 4: Non-pressure Communications Well Lid;
---Part 5: Sign Base Panel.
This document serves as a replacement of GB/T 24721.3-2009 Glass Fiber Reinforced Plastic Product for Highway - Part 3: Duct. In comparison with GB/T 24721.3-2009, apart from structural adjustments and editorial modifications, the main technical changes are as follows:
a) The classification of glass fiber reinforced ducts is modified (see 4.1; 3.1 of Version 2009);
b) The technical requirements for flame-retardant properties are modified (see Table 2; Table 2 of Version 2009);
c) Gasoline No., water temperature requirements for general tests and test temperature requirements for chemical media resistance are modified (see 6.2, 6.9 and 6.10; 5.2, 5.5.4 and 5.5.5 of Version 2009);
d) The test methods for flame-retardant properties are added (see 6.8).
Please be noted that certain content of this document may involve patents. The institution issuing this document does not undertake the responsibility of identifying these patents.
1 Scope
This document specifies the product classification, structures, dimensions and deviations, model, technical requirements, test methods, inspection rules, as well as marking, packaging, transportation and storage requirements for glass fiber reinforced plastic duct for highway.
This document is applicable to the production, inspection and usage of glass fiber reinforced plastic duct for highway (hereinafter referred to as "glass fiber reinforced duct").
2 Normative References
The contents of the following documents constitute indispensable clauses of this document through the normative references in the text. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 1458 Method for Mechanical Properties of Ring of Filament - Winding Reinforced Plastics
GB/T 5352 Fiber-reinforced Thermosetting Plastic Composites Pipe - Determination for External Loading Properties by Parallel-plate Loading
GB/T 14152 Thermoplastics Pipes - Determination of Resistance to External Blows - Round- the-clock Method
GB/T 24721.1-2023 Glass Fiber Reinforced Plastic Product for Highway - Part 1: General Rule
GB/T 24721.2-2023 Glass Fiber Reinforced Plastic Product for Highway - Part 2: Trunk
QB/T 2803 Determination of Deflection for Rigid Plastic Pipes
3 Terms and Definitions
This document does not have terms or definitions that need to be defined.
6 Test Methods
6.5.2 Wall thickness
Use a micrometer with a division value not greater than 0.01 mm to respectively measure-take three measurement values at the socket end and the insertion end; take the arithmetic mean as the measurement result.
6.5.3 Inner diameter of socket end
Use a caliper with a division value not greater than 0.02 mm to measure-take three values at an interval of 120° on the section of the duct socket end; take the arithmetic mean as the measurement result.
6.5.4 Length
Use a steel tape with a division value of 1 mm to respectively measure-take three values along the axial direction of the duct; take the arithmetic mean as the measurement result.
6.5.5 Deflection
In accordance with the stipulations of QB/T 2803, conduct the test.
6.6 Appearance Quality
In accordance with the stipulations of 6.5 in GB/T 24721.1-2023, conduct the test.
6.7 General Physical and Mechanical Properties
6.7.1 Tensile strength
6.7.1.1 Rolled and pultruded glass fiber reinforced ducts shall be tested in accordance with the stipulations of 6.6.1 in GB/T 24721.1-2023.
6.7.1.2 Winded glass fiber reinforced ducts shall be tested in accordance with the stipulations of GB/T 1458.
6.7.2 Flexural strength
6.7.2.1 Rolled glass fiber reinforced ducts shall be tested in accordance with the stipulations of 6.6.3 in GB/T 24721.1-2023.
6.7.2.2 Winded glass fiber reinforced ducts shall be tested in accordance with the stipulations of GB/T 5352; the circumferential flexural strength shall be calculated in accordance with Formula (1): Where, sigmaD---the circumferential flexural strength, expressed in (MPa); P---the maximum compressive load, expressed in (N); D0---the outer diameter of the duct, expressed in (mm); L---the length of the specimen, expressed in (mm); D---the inner diameter of the duct, expressed in (mm).
6.7.3 Density
In accordance with the stipulations of 6.6.5 in GB/T 24721.1-2023, conduct the test.
6.7.4 Barcol hardness
In accordance with the stipulations of 6.6.6 in GB/T 24721.1-2023, conduct the test.
6.7.5 Load deformation temperature
In accordance with the stipulations of 6.6.7 in GB/T 24721.1-2023, conduct the test.
6.7.6 Static friction coefficient of inner wall of duct
In accordance with the stipulations of Appendix B in GB/T 24721.2-2023, conduct the test. The length of the duct specimen is not less than 500 mm.
6.7.7 Duct rigidity
In accordance with the stipulations of GB/T 5352, conduct the test. The specimen length is 300 mm. When the radial change rate of the duct is 10% of the inner diameter, determine the duct rigidity.
6.7.8 Resistance to drop hammer impact
In accordance with the stipulations of GB/T 14152, conduct the test. The specimen length is 200 mm, and the test temperature is (20 ± 2) °C. Select Type D90 hammer, the hammer weight is 6.3 kg ± 32 g, and the drop height is 1 m ± 10 mm. For each specimen, impact once.
6.8 Flame-retardant Properties
In accordance with the stipulations of 6.7 in GB/T 24721.1-2023, conduct the test.
6.9 Water Resistance
In accordance with the stipulations of 6.10 in GB/T 24721.1-2023, conduct the test. […]
6.10 Resistance to Chemical Media
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 1458Test method for mechanical properties of ring of filament-winding reinforced composites
- GB/T 5352Fiber-reinforced thermosetting plastic composites pipe -- Determination for external loading properties by parallel-plate loading
- GB/T 14152Thermoplastics pipes -- Determination of resistance to external blows -- Round the clock method
- GB/T 24721.1-2023Glass fiber reinforced plastic product for highway - Part 1: General rule
- GB/T 24721.2-2023Glass fiber reinforced plastic product for highway - Part 2: Trunk
- QB/T 2803Determination of deflection for rigid plastic pipes
Similar standards
Editions of GB/T 24721.3
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 24721.3-2023 | Glass fiber reinforced plastic product for highway—Part 3:Duct | current edition | Current |
| GB/T 24721.3-2009 | Glass fiber reinforced plastic product for highway—Part 3:Duct | previous edition | Superseded |
This page sells the current edition, GB/T 24721.3-2023. Earlier editions are listed for reference only.
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Related Standards
GB/T 14152-2001 — Thermoplastics pipes -- Determination of resistance to external blows -- Round the clock method
GB/T 1458-2023 — Test method for mechanical properties of ring of filament-winding reinforced composites
GB/T 14580-2013 — Fixed capacitors for use in electronic equipment -- Part 17-1: Blank detail specification -- Fixed metallized polypropylene film dielectric a.c. and pulse capacitors -- Assessment level E and EZ
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