API standard 650 ground supported flat-bottom tanks seismic use group ii

Ultrasonic testing can find the internal defects of API standard 650 ground supported flat-bottom 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 ground supported flat-bottom tanks and so on metal oil tanks. The feature of this method is convenient and fast.

Determination of Required Capacity
The aggregate capacities required for any vent valves, pressure-relieving valves, and/or vacuum-relieving valves to be provided should be determined as follows:
a)For thermal breathing and product movement, the rules given in API 2000 shall be followed. The required capacity as the result of the product movement into the tank API standard 650 ground supported flat-bottom tanks given in API 2000, shall be multiplied by the ratio of the absolute tank pressure to atmospheric pressure (14.7 lbf/in.2 absolute).
b)For supplemental safety pressure-relieving devices to take care of extra venting capacity required in case of external fire exposure, the rules in API 2000 shall be followed.

API 650 petroleum storage tanks use lightning protection, anti-static, and fire protection measures. The internal corrosion protection should be determined according to the API standard 650 ground supported flat-bottom tanks storage medium, and the outer wall corrosion protection should be determined according to the soil quality of the buried tank.