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A678 grade A plates internal pressure of 4 lbf/in.2 gauge

A678 grade A plates internal pressure of 4 lbf/in.2 gauge

A678 grade A plates internal pressure of 4 lbf/in.2 gauge

During the use of internal pressure of 4 lbf/in.2 gauge, the tank material is prone to crack and leakage under the action of pressure, corrosion, wear and other conditions. Especially in the oil producing area, the temperature difference in four seasons is large and the natural environment is bad, which will accelerate the consumption of oil storage tank and cause many potential safety hazards. Therefore, the internal pressure of 4 lbf/in.2 gauge must undergo strict inspections before being put into use after the production and installation are completed, so as to avoid cracks and leakage in short-term use and affect production safety.

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internal pressure of 4 lbf/in.2 gauge any joints between the adjacent sections of stiffening rings, as shown in Figure R-1, shall be made so that the required moment of inertia of the combined ring-shell section is provided. Weld joints between adjacent sections shall be made with full-thickness and full-penetration butt-welds. Stiffening-ring butt-welds may employ metal backing strips. Backing strips and the associated welding shall be made in a manner that provides a smooth contour in the rat hole and all other weld joints ends. All weld passes shall be started at the rat hole.

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