GB/T 2550-1992 Rubber hose for welding and cutting Oxygen rubber hose GB/T2550-1992 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Rubber hose for welding and cutting
Oxygen rubber
Rubber hose
Specification for hose for equipment for gas welding, cutting and related processes-Oxygen rubber hose
This standard refers to and adopts the international standard ISO3821-1977 Welding 1 Subject content and scope of application
GB 2550-92
Replaces GB 2550-81
Similar flexible hose for gas welding operations".
This standard specifies the technical requirements and test methods for oxygen rubber hoses. This standard applies to rubber hoses (hereinafter referred to as hoses) used for welding and cutting of oxygen in an environment of -2045℃. 2 Reference standards
GB 528 Determination of tensile properties of vulcanized rubber GB1189 Appearance quality of rubber hose
GB3512. Rubber hot air aging test method GB5563 Hydraulic test method for hose
GB 9576 Guide to selection, storage, use and maintenance of rubber, plastic hoses and hose assemblies GB9577
Rules for marking, packaging and transportation of rubber, plastic hoses and hose assemblies 3 Product structure and size
3.1 Structure
The hose should 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 should comply with the provisions of Table 1. Table 1
Nominal dimensions and tolerances
Nominal inner diameter
Inner diameter tolerance
Note: The length of the hose shall be negotiated by the supply and demand parties. 3.3 Product marking
Marking content: product name, specification, standard code. Approved by the State Bureau of Technical Supervision on June 9, 1992 Length tolerance
1% of the total length of the hose
Thickness of the rubber layer shall not be less than
Inner rubber layer
Outer rubber layer
Implemented on June 1, 1993
Marking example:
4 Technical requirements
Oxygen rubber hose
CB2550-92
8GB2550
4.1 The physical and mechanical properties of the rubber used to manufacture the hose shall comply with the requirements of Table 2. Table 2
Performance Item
Tensile strength, MPa
Break length, %
Hot air aging
(70℃.72h)
Tensile strength change rate, %
Tear elongation change rate, %
The pressure resistance performance of the hose shall comply with the provisions of Table 3. 4.2
Working pressure
Test pressure
-Standard code
-Specification
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 method
5.1 The tensile strength and elongation of the hose rubber shall be determined in accordance with the provisions of GB528. 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
30～+10
Outer rubber layer
Minimum bursting 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 (calculated as 30m per piece). If the monthly output of the enterprise is less than 5,000, the monthly inspection shall not be less than one time. 6.3.1 The physical properties of the rubber shall comply with the provisions in Table 2. If there is an unqualified item, double samples shall be taken from the same batch of rubber, and the unqualified items shall be retested. If one of the samples still has one indicator that is unqualified after the retest, the batch of rubber cannot be used for production. 6.4 For each batch of hoses, one specification shall be selected as a representative, and one shall be selected for hydraulic pressure and burst test. If the test fails, double samples shall be taken from the product for retest. If one of the samples does not match after the retest, the batch of products shall be considered as unqualified. 7 Marking, packaging, storage and use
GB2550-92 wwW.bzxz.Net
7.1 The outer rubber layer of the rubber hose for transporting oxygen shall be blue 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.
7.3 The distance X between each two adjacent complete marks shall not exceed 3m. 7.4 The packaging and transportation of hoses shall be carried out in accordance with the provisions of GB9577. 7.5 The selection, storage, use and maintenance of hoses shall be carried out in accordance with the provisions of GB9576. Additional Notes:
This standard is issued 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 Rubber and Rubber Products Standardization. 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, Wang Wenjie,
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