Safety issues of expansion joints
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During maintenance, how is the safety inspection of expansion joints carried out?
Provisions for inspecting industrial pipeline expansion joints: 1. Check whether there are any scratches, dents, corrosion-induced perforations, cracks, etc. on the surface of the bellows expansion joint； 2. Is the wave spacing of the bellows normal, and is there any instability? ； 3. Check whether the hinges and pins of the hinge-type expansion joint are damaged, such as being deformed or fallen off ； 4. Check whether there are any abnormalities in the tie rods, bolts, and connection supports of the tie-rod type expansion joint.
There are many standards for expansion joints: JB/T 6171-1992 | Multi-layer metal bellows expansion joints; CB 1153-1993 | Metal bellows expansion joints; CBM 1033-1981 | Stainless steel bellows expansion joints; GB/T 12777-1999 | General technical requirements for metal bellows expansion joints; GB/T 12522-1996 | Stainless steel bellows expansion joints; GB 16749-1997 | Bellows expansion joints for pressure vessels; GB/T 12777-2008 | General technical requirements for metal bellows expansion joints