API standard 650 insulated tanks diameter

Ultrasonic testing can find the internal defects of API standard 650 insulated tanks welding joint, this detection method is very accurate for the internal layer defects of oil tank, but ultrasonic detection is not suitable for the detection of thin-walled storage tank materials. Dye penetrant testing is only suitable for detecting the defects of the surface opening of API standard 650 insulated tanks and so on metal oil tanks. The feature of this method is convenient and fast.

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 insulated tanks shell, including the corner weld between the shell and the bottom, shall be visually checked for tightness.

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 insulated tanks tank. Tap one inch NPT test hole in each pad or section.

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