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Zheng Y.-W.,Taizhou Special Equipment Supervision and Inspection Center | Gu R.-J.,Taizhou Special Equipment Supervision and Inspection Center | Xu L.-T.,Taizhou Special Equipment Supervision and Inspection Center | Ni S.-M.,Taizhou Special Equipment Supervision and Inspection Center
Petrochemical Equipment | Year: 2014

It was inconvenient for big liquefied petroleum gas spherical tanks to do overall inspection timely in closed state, and it was also difficult to track the re-welding locations for unacceptable defect. It was short of reliable methods to do integrity inspection and evaluation to tanks, especially to the equipment of serviced long time or extended. By inspecting of one 400 m 3 liquefied petroleum gas spherical tank which serviced for more than 20 years, partial inspection of the re-welding locations was done according to ultrasonic time of flight diffraction technique, integrity inspection and evaluation was done according to acoustic emission technique. It was concluded that the tank would continue to be used. The two new techniques can be combined in the integrity inspection and evaluation of big liquefied petroleum gas spherical tanks, and the result showed that it was practical.

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