Are there any specific detailed requirements for the inspection of spherical tanks?
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What are the specifications regarding the inspection of spherical tanks? I have reviewed standards such as TSG21, GB150, and GB12337, but they do not provide detailed inspection requirements – for example, rules for determining what to do once defects are detected, the depth at which welding repairs are necessary, which type of non-destructive testing should be used when the repair depth exceeds a certain level, or when heat treatment is required due to the depth of the defect, as well as procedures for hydrostatic testing, etc. I hope all fellow sailors will share their experiences; thanks.
⑴TSG 21； ⑵TSG R7001 \"Rules for Periodic Inspection of Pressure Vessels\" ； ⑶JB/T 4730 \"Non-destructive Testing of Pressure Equipment\" ； ⑷G150－2011 \"Pressure Vessels\" ； ⑸GB12337 \"Steel Spherical Storage Tanks\" ； ⑹GB/T19624－2004 \"Safety Assessment of Defective Pressure Vessels in Service\"
For external defects, regarding the standards you have listed, there are NDT standards specified in JB/T4730 for determining whether a defect constitutes an NDT defect
NB/T 47013.1~6/10~13-2015 has been officially released; the approval date is April 2, 2015, and the implementation date is September 1, 2015, replacing JB/T4730-2005
The third criterion is incorrect; NB/T47013.1–47013.6-2015 \"Non-destructive testing of pressure equipment\" has several further sections with different year designations. Plus, it’s not used much. Just write these generally