EN 10025 S355 plates API 650 aboveground steel oil storage tanks
Anti corrosion of API 650 aboveground steel oil storage tanks:After using for a certain period of time, it is necessary to check the corrosion protection of the API 650 aboveground steel oil storage tanks. If necessary, the outer wall of the metal oil tank should be painted with new anti-corrosion paint to ensure that the outer wall of the API 650 aboveground steel oil storage tanks does not fall off and has good waterproof and rust resistance.API 650 aboveground steel oil storage tanks cleaning:The long-term use of API 650 aboveground steel oil storage tanks will produce impurities on the tank wall and deposit on the tank bottom, resulting in tank corrosion to leakage. According to the safety standard of oil tank, the API 650 aboveground steel oil storage tanks shall be cleaned and derusted regularly to ensure the quality of oil stored and the safety of oil tank equipment.
All welded seams in the API 650 aboveground steel oil storage tanks bottom, and complete penetration and complete fusion sidewall-to-bottom welds, shall be inspected by means of a vacuum box test as described in Q.8.2.1. Sidewall-to-bottom welds not having complete penetration and complete fusion shall be inspected by means of either a vacuum box test of the inside weld as described in API 620 specification Q.8.2.1, or where approved by the Purchaser, a direct pressure solution film test as described in Q.8.2.2.
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 aboveground steel oil storage tanks tank. Tap one inch NPT test hole in each pad or section.
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