A53 grade A pipe API standard 650 partially anchored liquid-storage tanks

Impact Tests for High Alloys
Impact tests are not required for oil steel storage material nickel alloy welds made with electrodes/filler metals covered by AWS Specification A5.11 or AWS Specification A5.14, provided the nominal nickel content is 50% or greater, and the weld is deposited by the shielded metal-arc welding (SMAW), gas metal-arc welding (GMAW), gas tungsten-arc welding (GTAW), or plasma-arc welding (PAW) processes. When A5.11/A5.14 specifies the nickel content as a “remainder,” the nickel content shall be determined by summing the maximum specified values of the other elements (use the average specified value for elements with specified ranges) and subtracting from 100%.

The effect of air pressure on the API standard 650 partially anchored liquid-storage tanks tank walls of the API 650 tank must be considered when the design pressure is greater than 2 kPa.The fixed point method can be used to design the tank wall of atmospheric or micro internal pressure API standard 650 partially anchored liquid-storage tanks storage tank.

Tank cracks are common API standard 650 partially anchored liquid-storage tanks defects, mainly including tank wall cracks, internal cracks, weld zone cracks. The reason for these defects may be that the defects not exceeding the standard existed in the early stage of API standard 650 partially anchored liquid-storage tanks construction, which become obvious after the later use. Or in the process of using the API standard 650 partially anchored liquid-storage tanks, the tank body material generated new defects due to corrosion, pressure, wear and other reasons, and tank cracks.