Some standard content:
Chemical Industry Standard of the People's Republic of China
Rubber Hose for Engine Oil of Diesel Locomotives
This standard adopts the specification of ISOO/DIS2929--1986 Rubber Hose for Oil Transport of Oil Tankers-Subject Content and Scope of Application
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HG/T 2540--93
This standard specifies the specification, size, structure and technical requirements of rubber connecting hoses for conveying lubricating oil and cooling oil of diesel locomotives. This standard applies to rubber connecting hoses for conveying lubricating oil and cooling oil of oil pumps of 10 domestically produced Dongfeng 1.3 and Dongfeng 4 diesel locomotives, and the use temperature shall not exceed 90℃.
2 Reference standards
GB/T 528 Determination of tensile properties of vulcanized rubber and hot rubber GB/T1690 Test method for liquid resistance of vulcanized rubber GB/T3512 Test method for hot air aging of rubber GB/T 5562
GB/T 5563
GB/T 5564
GB/T 9571
GB/T 9573
GB/T 9576
GB/T 9577
Physical test method for rubber hose layer
Hydraulic test method for rubber hose
Low temperature bending test method for rubber hose
Evaluation of ozone resistance of rubber and plastic hoses under static conditions Measurement method for dimensions of rubber, plastic soft and hose assemblies Selection, storage, use and maintenance guide for rubber, plastic hoses and hose assemblies Marking, packaging and transportation rules for rubber hoses and hose assemblies HG/T2185 Appearance quality of rubber hoses
3 Structure, specifications and working pressure
3.1 Structure
The hose is composed of an inner rubber layer, a fiber reinforcement layer and an outer rubber layer of a metal spiral wire. 3.2 Specifications and dimensions
The specifications and dimensions of the hose shall comply with the provisions of Table 1. Approved by the Ministry of Chemical Industry of the People's Republic of China on September 6, 1993 and implemented on December 1, 1994
HG/T 2540..93
Note: The hoses of other specifications and sizes shall be determined through negotiation between the supply and demand parties. The end face of the hose head shall be covered with oil-resistant rubber, and the skeleton material shall not be exposed. The maximum working pressure of the hose shall comply with the provisions of Table 2. 3.3
Inner diameter mm
4 Technical requirements
4.1 Appearance quality
The appearance quality of the hose shall comply with the provisions of HG/T2185. 4.2 Rubber properties
The physical and mechanical properties of the rubber used to manufacture the hose shall comply with the provisions of Table 3. Table 3
Tensile strength, MPa
Elongation at break, %
Hot air aging (100×?2h)
Liquid resistance Volume change rate, light
4.3 Finished product performance
115±2
130±2
155—2
Tensile strength change rate, %, reduction
Liquid cRoom temperature×72h)
No. 3 standard push oil (100℃×72h)
Glue layer thickness (minimum value)
Maximum working pressure, MPa
The finished hose performance shall comply with the provisions of Table 4
Ozone resistance (40×72h), 50MPa (50pphm) Low temperature bending (25×24h)
Adhesion strength, kN/m
Medical strength requirements
HC/T 2540—93
Glue and reinforcement layer
Reinforcement layer and reinforcement layer
Static pressure test (2 times working pressure)
4.4 The warranty period of the hose is one overhaul period of the diesel locomotive (locomotive mileage 180,000 to 220,000 kilometers). Means
The outer rubber layer does not crack
The inner and outer cavity layers do not crack
No abnormal phenomenon
Not less than 4 times the working pressure
4.5 Under the transportation and storage conditions specified in GB/T9576 and GB/T9577, within one year from the date of manufacture, the manufacturer shall ensure that the various technical properties of the hose meet the requirements of this standard. 5 Test method
5. 1 Specifications, dimensions and appearance quality inspection of the hose shall be carried out in accordance with GB/T 9573 5.2 Rubber tensile test, according to GB/T528, using type 1 test specimen. 5.3 Hot air aging test, according to GB/T3512. 5.4 Liquid resistance test, according to GB/T1690. 5.5 Hose ozone resistance test, use the same material and production process (without metal spiral wire) to make a test hose with an inner diameter of 25mm, take about 700mm length, and connect GB/T9571 method 1 to escape 5.6 Low temperature bending test, cut the test hose that meets the requirements of 5.5, the length is about 800mm, the minimum bending radius is 250mm, and it is carried out according to GB/T5564.
5.7 Adhesion strength test, according to GB/T 5562. 5.8 Hydraulic test, according to GR/T5563. 6 Inspection rulesbzxz.net
6.1 The hose should be inspected batch by batch by the technical inspection department of the manufacturer. Qualified products shall be accompanied by a quality certificate before leaving the factory. 6.2 The appearance and size of the hoses shall be checked one by one. 6.3 Each batch of hoses shall not exceed 1,000 pieces, and the rubber materials used to manufacture each batch of hoses shall be tested for physical and mechanical properties. 6.4 Performance test of finished hoses:
6.4.1 Each batch of hoses shall not exceed 1,000 pieces, and samples shall be taken from any specification as a representative. 6.4.2 Low-temperature bending, adhesion strength and hydraulic test items shall be tested at least once every quarter. 6.5 Ozone resistance performance test is a type test item, but it shall not be tested less than once a year. 6.6 When the performance of the finished rubber hose is tested, if there are unqualified items, double samples shall be taken from the batch of rubber or hoses, and the unqualified items shall be retested. If one of the samples still fails to meet one indicator after the retest, the batch of rubber or products shall be unqualified. 7 Marking, packaging, transportation and storage
7.1 The hose should have the following obvious markings that are not easy to fall off: manufacturer name or trademark:
b, product name, specifications, working pressure; c. National Standard Number,
d. Production date.
7.2 The hose should be packed and sealed with packaging materials. HG/T 2540-93
7.3 The hose should be placed flat or vertically when stored, and the stacking height should not exceed 1.5m7.4 The transportation, storage and other requirements of the hose should comply with the provisions of GB/T 9576 and GB/T 9577. Additional remarks:
This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Rubber Hose Sub-Technical Committee of the National Rubber and Rubber Products Standardization Technical Committee. This standard was drafted by Guangzhou Rubber Hose Factory
The main drafters of this standard are Liang Saiban, Bu Quanben, and Shu Ying. 284
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