HG/T 2301-1992 Fabric reinforced thermoplastic hose for compressed air
Some standard content:
Chemical Industry Standard of the People's Republic of China
Textile reinforced thermoplastic plastic hose for compressed air This standard is equivalent to the international standard ISO5774-1980 "Plastic Hose Specification".
Subject content and scope of application
HG/T2301-92
-Textile reinforced thermoplastic hose for compressed air This standard specifies the model, specification, technical requirements and test methods of textile reinforced thermoplastic plastic hose for compressed air. This standard applies to plastic hoses for compressed air with working temperatures ranging from -10℃ to 55℃. Reference standards:
Test method for liquid resistance of vulcanized rubber
GB1690
GB5562
GB5563
Physical test method for rubber layer of hose
Hydraulic test method for hose
GB5564
Test method for low-temperature bending of hose
GB9573
Method for measuring dimensions of rubber, plastic hoses and hose assemblies GB9575
Inner diameter dimensions and length tolerances of rubber and plastic hoses Selection, storage, use and use of rubber, plastic hoses and hose assemblies Maintenance Guide GB9576
Marking, packaging and transportation rules for rubber, plastic hoses and hose assemblies GB9577
3 Product classification, structure, materials and marking
3.1 Model n)
According to the maximum working pressure of the hose, it is divided into: Type A - industrial air hose with a maximum working pressure of 1.0MPa; Type C -
- air hose for mining and construction with a maximum working pressure of 1.6MPa 3.2 Structure, materials
The color, transparency and physical properties of the materials used for plastic hoses should meet the quality requirements, and it should be composed of the following parts: a flexible thermoplastic plastic inner layer resistant to oil mist; a.
b. Natural or synthetic fabric reinforcement layer;
c. Flexible thermoplastic outer layer, its surface can be smooth or corrugated, and its color can be different from the inner layer3.3 Marking
3.3.1 Marking content
Includes product name, model, specification, and standard code. Because the product name is too long, it is abbreviated as: air compressor plastic pipe3.3.2 Example
Instructions for use:
1) The product model is consistent with ISO5774, and B and D types are to be supplemented. The Ministry of Chemical Industry of the People's Republic of China approved the standard on June 1, 1992. All kinds of standard industry information are free to download on mb.com. It was implemented on October 1, 1993.
Air Compressed Plastic Pipe
4 Technical Requirements
4.1 Appearance
HG/T2301
HG/T2301-92
Standard Code
Product Name||tt| |The inner and outer plastic layers of the hose should be uniform in texture and free of appearance defects such as cracks, pores and foreign impurities, as well as other defects that affect performance.
4.2 Dimensions and deviations
4.2.1 Inner diameter
According to GB9575, the inner diameter and deviation of the hose should comply with the requirements of Table 1, Table 1 Nominal inner diameter
Nominal inner diameter
4.2.2 Length
The length deviation of the hose should comply with the requirements of Table 2.
Nominal inner diameter
Table 2 Cutting length deviation
Below 300
300~600
Above 600~900
Above 900~1200
Above 1200~1800
Above 1800
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4.3 Hydraulic performance requirements
HG/T 2301-92
4.3.1 In an ambient temperature of 23±2℃, the hydraulic performance of the hose shall comply with the requirements specified in Table 3 Table 3 Hydraulic performance requirements
Working pressure, MPa
Test pressure, MPa
Diameter change under test pressure, %
Length change under test pressure, %
Burst pressure, MPa
4.3.2 Under the test pressure, the hose shall have no leakage, cracking or other damage 4.4 Interlayer adhesion strength
The adhesion strength between the layers of the hose shall not be less than 1.5kN/m, and the thickness of the inner or outer layer shall be less than 1.0m The adhesion strength of hoses with a length of m may not be tested".
4.5 Low temperature bending performance
In a low temperature environment of -10℃, the hose shall be free of cracks after the bending test as specified. The hose shall be free of cracks or leakage after the hydraulic test.
4.6 Heating mass loss performance
The heating mass loss of the inner and outer layer samples of the hose shall not exceed 4%. 4.7 Liquid resistance
After the inner layer sample of the hose is immersed in No. 1 standard oil at 55℃ for 24 hours, the volume change shall not exceed 15%. Test method 2
5.1 The size and deviation of the hose shall be carried out in accordance with the provisions of GB9573 Measurement. 5.2 Hydraulic test shall be carried out in accordance with the provisions of GB5563. 5.3 Adhesion strength between layers of the hose shall be tested in accordance with the provisions of GB5562. 5.4 Low temperature bending test method
Stretch the hose flat and place it in a low temperature environment of -10°C. After 24 hours, bend the hose flatly and evenly around a mandrel with a diameter of 2 times the minimum bending radius specified in Table 4 at -10°C. The bending time shall not be less than 8s and not more than 12s. After bending, raise the temperature of the hose to room temperature and inspect it visually. Hoses with a nominal inner diameter of less than 25mm are bent 180° around the mandrel; hoses with a nominal inner diameter of 25mm or more are bent 180° around the mandrel. Bend 90°, and the rest shall be carried out in accordance with the provisions of GB5564. After the low-temperature bending test, the hose shall be subjected to a hydraulic test in accordance with the provisions of GB5563. Instructions:
1) ISO5774 does not have this sentence,
2) ISO5774 does not have this chapter
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HG/T2301-92
Table 4 Minimum bending radius
5.5 Heating mass loss test shall be carried out in accordance with the method specified in Appendix A of this standard. 5.6 Liquid resistance test shall be carried out in accordance with the provisions of GB1690. 6 Inspection rules\
6.1 The appearance quality and specification size of the hose shall be inspected one by one, and the curve
: 240
6.2 The hose shall be inspected and accepted in batches by the technical inspection department of the manufacturer. The quantity of each batch shall not exceed 100,000 meters, but shall be no less than once a month. The hose shall be tested for hydraulic pressure, adhesion strength, heating mass loss and liquid resistance. If any of the above performance tests fail, double samples shall be drawn from the batch of products for retesting of the unqualified items. If one sample still fails in the retest, the batch of products shall be considered unqualified. 6.4 The low-temperature bending performance test of the hose shall be conducted at least once every six months. 7 Marking, packaging, transportation and storage 2 Marking, packaging, transportation and storage shall comply with the relevant provisions of GB9576 and GB9577. Instructions for use: 1) ISO5774 does not have this chapter, 2) ISO5774 does not have this chapter.
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HG/T2301-92
Appendix A
Determination of plasticizer loss rate in plastics (activated carbon note) (supplement)
This appendix is equivalent to the international standard ISO176-1976 "Plastics-Measurement of plasticizer loss-activated carbon method" A. This appendix specifies the method of quantitatively determining the plasticizer loss rate in plastics using activated carbon at a certain time and temperature. A1 Principle
Using the strong adsorption effect of activated carbon, the plastic sample is buried in the activated carbon to adsorb the plasticizer in the plastic sample, and the weight change of the sample is measured to calculate the loss rate of the plasticizer in the plastic. A2 Instruments and Materials
A2.1 Analytical balance: accurate to 0.001g; A2.2 Dial indicator: accurate to 0.01mm;
A2.3 Constant temperature bath or oven, with a temperature range of 50~150℃, and capable of maintaining the test temperature fluctuation within ±1℃. A2.4 Container: A cylindrical metal can with a lid. Its diameter is 100mm, height is 120mm, and there is a 3mm diameter vent on the lid.
Activated carbon: Its particle size is about 4~6mm. It should be sieved before use and dried to constant weight at 70℃ and stored in a dry and sealed container for use. Fresh activated carbon should be used for each test. A3 Specimen
A3.1 Cut a 50±1mm diameter and 1±0.00mm thickness from a stress-free and oriented, bubble-free and void-free pressed plastic sheet.1mm round sample,
A3.2 The number of samples should be no less than 3.
A4 Operation steps
A4.1 Place the sample at room temperature for 2 hours before testing. A4.2 Weigh the samples one by one, accurate to 0.001g, and use a dial indicator to measure its average thickness, accurate to 0.01mm. A4.3 Spread about 120cm2 of activated carbon on the bottom of the metal container, place one sample on the activated carbon, cover it with 120cm3 of activated carbon, and then bury the remaining two samples in the same container in the same way. Finally, cover the container. A4.4 Place the metal container in an oven or constant temperature bath controlled at 70±1℃. After 24 hours, take out the container and cool it at room temperature. Take out the sample from the container, carefully brush off the small amount of activated carbon adhering to it, and place it at room temperature for 2 hours. A4.5 Weigh each sample to an accuracy of 0.001g. A5 Calculate the plasticizer loss rate of the sample (expressed as mass percentage) according to formula A1, WbZxz.net
m. -m,
Where: w
-plasticizer loss rate of the sample after the test, %; X100-
mo-the mass of the sample at room temperature before the test, gw-the mass of the sample after the test (the sample is buried in activated carbon at 70℃ for 24 hours and then placed at room temperature for 2 hours), gm
The arithmetic mean of the results of the three samples is taken as the plasticizer loss rate value of the plastic. A6 Test Report
The test report shall include the following contents:
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HG/T2301—92
Indicate that the test is carried out according to the method specified in Appendix A of this standard; Comprehensive identification of the sample required;
The thickness of each sample, accurate to 0.01mm; The plasticizer loss rate of the sample at room temperature; Expressed as mass percentage; Test date (year, month, day);
Tester.
Additional notes:
This standard is proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China, and this standard is under the jurisdiction of the Rubber Hose Sub-Technical Committee of the National Technical Committee for Standardization of Rubber and Rubber Products. This standard was drafted by the Shenyang Rubber Industry Products Research Institute of the Ministry of Chemical Industry. The main drafter of this standard is Zhao Jingzi.
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