The First Machinery Industry Department of the People's Republic of China standard welded bulkhead straight pipe joint JB974-77 Replace JB974-67 This standard applies to the wall straight pipe joint in the oil medium pipeline system, with a nominal pressure of 320kgf/cm2 and a working temperature of -25~80℃. Maximum bulkhead thickness Marking example: Pipe outer diameter D. 28mm bulkhead straight pipe joint: pipe joint 28JB974-77 The First Machinery Industry Department of the People's Republic of China issued the First Machinery Industry Department Standardization Research Institute proposed to implement on May 1, 1977 Jinan Foundry and Forging Machinery Research Institute and others drafted 337bZxz.net 3974-77 s'x9tw 12266 82286882982184 Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.