API standard 650 self-anchored tank load combinations

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 standard 650 self-anchored tank tank. Tap one inch NPT test hole in each pad or section.

For the welding of API standard 650 self-anchored tank bottom, attention should be paid to the slag removal and drying of the welding joint before welding, and there is no sediment and oil contamination in the lap joint of steel plate. The manufacturing quality and production efficiency of the central plate can be obviously improved by adopting the rolling central plate. The butt joint is used between the rolling plates to improve the installation conditions of the central plate at the bottom of the API standard 650 self-anchored tank. The welding sequence of the central plate is from the center of the central plate to the surrounding.

The tank shall be filled with water to the design liquid level unless height is limited as noted in API 620 standard Q.8.1. After the tank is filled with water and before the pneumatic pressure is applied, anchorage, if provided, shall be tightened against the hold-down brackets. All welds in the API standard 650 self-anchored tank shell, including the corner weld between the shell and the bottom, shall be visually checked for tightness.

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