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This standard specifies that the union-assembly is applicable to oil, gas and general corrosive medium pipeline system.
Example of designation:
The union-assembly with the nominal pressure class J and the tube outer diameter D0 of 14 mm is designated as:
Assembly J14 GB 3737.1-83
Note: The mass is the calculated value and the specific gravity is 7.85 kg/dm3.
The technical conditions shall meet the requirements of GB 3765-83.
Additional explanation
This standard was proposed by the Ministry of Machine Building of the People's Republic of China and is under the jurisdiction of Standardization Research Institute of the Ministry of Machine-Building Industry.
From the date of implementation of this standard, the original standard JB 1944-77 Union-Assembly is abolished.
