GB/T 2551-1992 Rubber hose for welding and cutting Acetylene rubber hose GB/T2551-1992 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Rubber hose for welding and cutting
Acetylene rubber hose
Specification for hose for equipment for gaswelding ,cutting and related processes-Acetylene rubber hose
GB 2551-92
Replaces GB2551-81
This standard refers to and adopts the national standard ISO3821-1977 "Flexible hose for welding-like gas welding operations". 1. Subject content and scope of application
This standard specifies the technical requirements and test methods for acetylene rubber hoses. This standard applies to rubber hoses for welding and cutting and transporting acetylene in an environment of 20 to 45°C (hereinafter referred to as hoses). 2 Reference standards
GB528 Determination of tensile properties of vulcanized rubber
GB1189 Appearance quality of rubber hoses
GB3512 Rubber hot air aging test method GB5563 Rubber hose hydraulic test method
Guide to the selection, storage, use and maintenance of rubber, plastic hoses and hose assembliesGR 9576
GB9577
Rules for marking, packaging and transportation of rubber, plastic hoses and hose assemblies 3 Product structure and dimensions
3.1 Structure
The hose shall consist of an inner rubber layer, a reinforcement layer and an outer rubber layer. 3.2 Specifications and dimensions
The specifications and dimensions and tolerances of the hose shall comply with the provisions of Table 1. Table 1bZxz.net
Nominal dimensions and tolerances
Nominal inner diameter
Inner diameter tolerance
Note: The length of the hose The supplier and the buyer shall negotiate and resolve the issue. 3.3 Product marking
Marking content: product name, specification, standard code. Marking example:
Approved by the State Bureau of Technical Supervision on June 9, 1992 Length tolerance
1% of the total length of the hose
The thickness of the rubber layer shall not be less than
Inner rubber layer
Outer rubber layer
Implemented on June 1, 1993
4 Technical requirements
Acetylene rubber hose
GB 2551—92
GB2551
4.1 The physical and mechanical properties of the rubber compound used to manufacture the hose shall comply with the provisions of Table 2. Table 2
Performance Item
Tensile Strength, MPa
Elongation at Break, %
Hot Air Aging
Change in Tensile Strength, %
Change in Elongation at Break, %
4.2 The pressure resistance requirements of the hose shall comply with the provisions of Table 3. Table 3
Working Pressure
Test Pressure
Standard Code
Product Name
Inner Rubber Layer
4.3 The hose shall not leak under the specified test pressure, and shall not have local bulges or other abnormal phenomena. 4.4 The appearance quality of the hose shall comply with the requirements of GB1189. 5 Test methods
5. 1 The tensile strength and tear elongation of hose rubber shall be determined in accordance with GB 528. 5.2 The hot air aging test of hose rubber shall be carried out in accordance with GB3512. 5.3 The hydraulic test of hose shall be carried out in accordance with GB5563. 6 Inspection rules
25～+25
—30～+10
Outer rubber layer
Minimum dry burst pressure
6.1 The hose shall be inspected in batches by the inspection department of the manufacturer, and each batch of products must be accompanied by a quality certificate before leaving the factory. 6.2 The appearance and size of the hose shall be checked one by one. 6.3 The physical properties of the hose rubber and the pressure resistance of the hose are random inspection items. Each inspection batch is stipulated to be 5,000 pieces (calculated as 30m per piece). If the monthly output of the enterprise is less than 5,000 pieces, the monthly inspection shall not be less than times. 6.3.1 The physical properties of the rubber material shall meet the requirements in Table 2. If any item does not meet the requirements, double samples shall be taken from the same batch of rubber materials, and the unqualified items shall be retested. If one of the samples still fails to meet the requirements after the retest, the batch of rubber materials cannot be used for dust production. 6.4 For each batch of hoses, one specification shall be selected as a representative, and one shall be selected for hydraulic and blasting tests. If the test fails, double samples shall be taken from the product for retest. If one of the samples fails to meet the requirements after the retest, the batch of products shall be unqualified. 7 Marking, packaging, storage and use
7.1 The outer rubber layer of the rubber hose for transporting acetylene shall be red. 7.2 The hose shall have the following marks that are not easy to fall off: a. Standard number;
b. Manufacturer's name or trademark;
c. Product specifications.
GB2551-92
7.3 The distance X between each two adjacent complete marks shall not exceed 3m. 7.4 The packaging and transportation of hoses shall comply with the provisions of GB9577. 7.5 The selection, storage, use and maintenance of hoses shall comply with the provisions of GB9576. Additional remarks:
This standard is proposed by 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 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 and Qingdao Sixth Rubber Factory. The main drafters of this standard are Yan Songfeng, Wang Baozhu, Wang Weixiang, Wang Jianzhi and Wang Wenjie.
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