Under-bottom connections for API standard 650 carbon and low-alloy steel tanks

This API 650 tank standard is designed to provide industry with tanks of adequate safety and reasonable economy for use in the API standard 650 carbon and low-alloy steel tanks storage of petroleum, petroleum products. and other liquid products.

Temporary Openings after Hydrostatic Test
When approved by the Purchaser in writing, and only in the case of tanks which when complete have no shell penetrations, it is permitted to restore by welding up to four temporary shell openings after the hydrostatic test in accordance with the provisions of this section. Each temporary opening shall be restored by the insertion of a shell plate that matches the thickness and specification of adjacent shell material, and is welded into place with full fusion butt-welds. The API standard 650 carbon and low-alloy steel tanks insert plate shall be round with diameter no less than 24 in. and no greater than 42 in.

When the API standard 650 carbon and low-alloy steel tanks is welded, the weldment should be fixed rigidly. After welding, when the weldment is cooled to normal temperature, the rigid fixation can be removed, which can effectively prevent angular deformation and wave deformation. Although some measures have been taken, the welding deformation of API standard 650 carbon and low-alloy steel tanks is still unavoidable, so it is necessary to take corrective measures to compensate the deformation. Mechanical correction is to make the parts easy to deform in the welding process by mechanical or other rigid materials to produce simple deformation, so as to restore the state before welding.

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