Seismic effects in API 650 cylindrical liquid-storage tank

In order to prevent the deformation of the bottom of metal vertical storage tank, API 650 cylindrical liquid-storage tank during welding, the number of welders should be reasonably distributed. When welding metal vertical API 650 cylindrical liquid-storage tank, personnel and welding position shall be reasonably allocated according to the actual situation of welding personnel, and random welding is not allowed.

Production Weld Tests
Production weld test plates shall be welded for API 650 cylindrical liquid-storage tank primary-component butt-welded shell plates when welding procedure qualifications are required to be impact tested per Q.6.2 and Q.6.3. The number of production weld tests shall be based on the requirements of Q.6.6.3 and Q.6.6.4. The locations impact tested (i.e., HAZ and/or weld deposits) shall likewise be the same as required for weld procedure qualifications per Q.6.2 and Q.6.3. Weld testing shall be in accordance with Q.6.6.5. Test plates shall be made from plates produced only from the heats that are used to produce the shell plates for the large welded steel tank.

Test welds of each API 650 tank nozzle and manway reinforcing pad (or each section of multiple piece pad) using dry air and apply a soap solution test in the presence of Purchaser's Inspector before hydro testing the API 650 cylindrical liquid-storage tank tank. Tap one inch NPT test hole in each pad or section.

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