GB 10546-1989 Liquefied petroleum gas (LPG) rubber pipe GB10546-1989 Standard download and decompression password: www.bzxz.net

National Standard of the People's Republic of China
Liquefied petroleum gas (LPG) rubber hose
Liquidpetroleum gas rubber hoseGB10546-89
This standard is equivalent to the international standard ISO2928-1986 "Transportation of Liquefied Petroleum Gas" Use (LPG) rubber hose》. 1 Subject content and scope of application
This standard specifies the technical requirements, test methods, inspection rules, product marking, packaging, storage, etc. for rubber hoses used to transport liquefied petroleum gas (LPG).
This standard is applicable to rubber hoses used by railway tankers and automobile tankers to transport "liquid" liquefied petroleum gas within the range of -40 to 60℃.
2 cited standards
GB527
General requirements for physical test methods of vulcanized rubber GB 528 Determination of tensile properties of vulcanized rubber GB1189
GB1690
GB2941||tt ||GB3512
GB5562
GB5563
GB5564
GB9571
GB9572
GB9576
GB9577
3 Structure and Dimensions
3.1 Structure
Hose Appearance Quality
Vulcanized Rubber Liquid Resistance Test Method
Standard Temperature, Humidity and Time for Rubber Sample Parking and Testing Rubber Hot Air Aging test method
Hose rubber layer physical test method
Hose hydraulic test method
Hose low-temperature bending test method
Ozone resistance test method for rubber and plastic hoses under static conditions Rubber , Plastic hose resistance performance measurement
Guidelines for selection, storage, use and maintenance of rubber, plastic hoses and hose assemblies Marking, packaging and transportation rules for rubber, plastic hoses and hose assemblies Hoses from within It consists of rubber layer, fiber (steel wire) reinforcement layer and outer rubber layer. 3.2 The dimensions and tolerances of hoses should comply with the requirements in Table 1. The Ministry of Chemical Industry of the People's Republic of China approved the implementation on 1989-12-01 on 1989-02-01
Name content
Public
8.0
10.0
12.5| |tt||16.0
20.0
25.0
31.5
40
50
63
80||tt ||100
160
200
GB10546—89
Table 1
Allowable tolerance
± 0.75
± 1.25
±1.5
±2.0
3.3 The length of the hose is proposed by the user and determined with the consent of the manufacturer. The length tolerance is ±1% of the total length of the hose. 4 Technical requirements
4.1 The physical and mechanical properties of the hose should comply with the provisions of Table 2. Table 2
Properties
Tensile strength, MPa
Elongation at break, %
Hot air aging
100℃×72h||tt ||Adhesion strength, kN/m
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item
item
tensile strength change rate
change rate of elongation at break| |tt||Between each layer
4.2 The hydraulic requirements of the hose should comply with the provisions of Table 3. minimum value
minimum value
minimum value
minimum value
minimum value
refers to
inner rubber layer
7.00
200
- 25
- 50
1.5
standard
outer rubber layer
10.0||tt| |250
mm
Working pressure
2.0
GB10546—89
Table 3
Test pressure
6.3| |tt||4.3 The hose should be kept under the test pressure for 1 minute and there should be no leakage or bubbling. Minimum burst pressure
12.6
MPa
4.4 When the hose is maintained under the test pressure for 1 minute, its length change rate should not be greater than 7%. 4.5 Low-temperature bending performance: The hose must be placed for 24 hours at a temperature of -40±3°C and subjected to a bending test. No cracks shall appear. When the sample returns to normal temperature, conduct the pressure test again under the test pressure. There should be no leakage. 4.6 Liquid resistance:
Use the finished inner rubber (or rubber material) sample to immerse it in n-hexane liquid at room temperature of 23±2℃. After leaving it for 72-h, the tensile strength of the sample will Strength and elongation at break should not be less than 65% of the initial value. 4.7 Ozone resistance:
Place the finished outer rubber (or rubber material) sample in a test chamber with an ozone concentration of 50±5pphm and a temperature of 40°C. After keeping it for 72 hours, use a 2x magnifying glass to check the surface. There should be no turtles. cracking phenomenon. 4.8 Electrical conductivity:
The electrical conductivity of the hose is proposed by the user and can be agreed upon by both the supplier and the buyer. 4.9 Leakage performance:
The permeability of the hose is proposed by the user and can be agreed upon by both parties. 4.10 The appearance quality of the hose complies with the regulations of GB1189. 5 Test methods
5.1 The specifications and dimensions of the hose should be checked with a vernier caliper or an appropriate measuring tool, and the length should be measured with a meter stick. 5.2 The appearance quality of the hose shall be inspected visually. 5.3 Hydraulic test of hoses shall be in accordance with the provisions of GB5563. 5.4 The tensile strength, elongation at break, and length change rate tests of hoses shall be carried out in accordance with the provisions of GB528. 5.5 The adhesion strength test between each layer of the hose shall be in accordance with the provisions of GB5562. 5.6 Hot air aging test of hoses shall be in accordance with the provisions of GB3512. 5.7 Low-temperature bending test of hoses shall be in accordance with the provisions of GB5564. 5.8 Liquid resistance test of hose (or rubber material) shall be in accordance with the provisions of GB1690. 5.9 The ozone resistance test of hoses shall be in accordance with the provisions of GB9571. 5.10 Conductive test of hoses shall be in accordance with the provisions of GB9572. 5.11 The permeability test of hoses shall be in accordance with the provisions of Appendix A. 6 Inspection Rules
6.1 Hose shall be inspected in batches by the technical inspection department of the manufacturer. The quantity of each batch shall not exceed 500 pieces. Each batch of products shall be accompanied by a product certificate when leaving the factory. 6.2 Each batch of hoses should be inspected one by one for specifications, dimensions and appearance quality. 6.3 Choose any one specification from the same batch of hoses as a representative, and take any one of them to check the physical and mechanical properties (if the finished product is not suitable for testing or the testing equipment is limited, semi-finished products or samples can be used instead). 6.4 Hoses tensile strength, elongation at break, constant pressure, burst pressure, length change rate, liquid resistance, and adhesion strength tests shall be conducted once a quarter.
6.5 hose ozone aging and low temperature bending test, conducted once a year. 6.6 The conductivity and permeability performance test of the hose shall be carried out according to the regulations agreed upon by the supplier and the buyer. GB10546-89
6.7 If one index is unqualified in the physical and mechanical performance inspection, double samples should be taken from the same batch of products and the unqualified items should be retested. After the retest, there is still one index that is unqualified. 7 marks, packaging, transportation, storage and use 1.1 The outer rubber layer of the hose is orange-yellow, or horizontal yellow tapes are embedded on the surface of both ends to make it obvious The mark indicates that the hose is used to transport liquid liquefied petroleum gas.
1.2 Hoses with an inner diameter less than 76mm can be packaged in coils (the inner diameter of the coil should not be less than 15 times the inner diameter of the hose), but those with an inner diameter of 76mm or more should be packed straight.
7.3 When storing hoses, the temperature in the warehouse should be maintained at -15~40°C, and the relative humidity should be between 50% and 80%. 7.4 When storing hoses, they should be laid flat, and the stacking height should not exceed 1.0m. During storage It should be turned over once a quarter. 7.5Other contents are in accordance with the provisions of GB9576 and GB9577 GB10546-89
Appendix A
Permeability test method
(Supplement)
This appendix refers to ISO8308-1978 "Rubber , plastic hoses and pure rubber hoses - Determination.
A1 Scope
- Liquid Penetration Hose and Pure Rubber Hose Wall Properties This appendix specifies the method for determining the liquid penetration resistance of liquefied petroleum gas (LPG) rubber hose walls. A2 test device
The test device is shown in Figure A1:
Pressure regulator
Pressure amount
A3 test principle
?
Safety Lan
Main wide door
Pressure gauge
Graduating cylinder
Sample-
Figure A1
?
1 | |tt | Then, remove the pressure and measure the volume change of the liquid in the measuring cylinder at the top of the hose before and after pressurization, thereby calculating the liquid loss per square centimeter of the hose wall of the sample that is penetrated every 24 hours. A4 test procedure
Measure the inner diameter (D) of the hose sample and the net length (L) between the two end joints; a.
Mount the sample to the test device (see figure A1), b.
c. Fill the sample and measuring cylinder with test fluid until the top of the measuring cylinder reaches full scale and then close the injection valve; d., pressurize the measuring cylinder and sample to 50 ± 5kPa, close the main valve, hold it for 5 minutes, and then open the release valve. Depressurize the valve to eliminate the gas dissolved in the liquid. Then, record the height of the liquid level in the measuring cylinder as the initial liquid value (V.). Then pressurize the measuring cylinder and sample to 50±5kPa. After 24 hours, close the main valve and slowly Open the relief valve to release the pressure. After 5mine.
GB10546-89
, record the liquid level height in the measuring cylinder, which is the final liquid value (Vuh). A5 Calculation and expression of results
Calculate the loss value of liquid per square centimeter of the hose wall of the sample per 24h, expressed in g/(cm224h): (V-Van)·d
P | |tt | Value, cm2;
d—liquid density, g/cm3
D—sample inner diameter, cm,
L—sample net length, cm.
Additional notes:
This standard is under the jurisdiction of the National Technical Committee for Standardization of Rubber and Rubber Products. This standard is drafted by Shanghai Rubber Factory. The main drafters of this standard are Wang Anfu and Dong Juping.
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