API standard 650 cylindrical liquid-storage tank seismic use group i

All API standard 650 cylindrical liquid-storage tank fillet welds shall consist of a minimum of two passes. The ends of the fillet welds shall be 2 in. from the rat hole, and these welds shall be deposited by starting 2 in. from the rat hole and welding away from the rat hole. An acceptable alternative to stopping fillet welds 2 in. short of the rat hole would be to weld continuously through the rat hole from one side of the stiffener to the opposite side. All craters in fillet welds shall be repaired by back welding.

Supply covers for API standard 650 cylindrical liquid-storage tank connections specified with the service covers remaining in place following tests. For API 650 tank connections not specified to be supplied with service covers, the test covers may be removed after testing.

Oil tank is often used to store crude oil, diesel oil, gasoline and other oil. The main structure of API standard 650 cylindrical liquid-storage tank is composed of tank top, tank wall, tank bottom and accessories. The API standard 650 cylindrical liquid-storage tank should be inspected after the completion of construction, and the detection methods of different structure positions are different. Tank wall inspection: for the newly built oil tank, water filling test shall be conducted to check whether the tank wall is tight, and the appearance inspection shall be conducted for the tank wall plate and weld. Tank wall thickness detection: the oil tank wall thickness is mainly detected by ultrasonic wave, with high efficiency.