API 650 welded tanks for oil storage stainless steel armored hose

Ultrasonic testing can find the internal defects of API 650 welded tanks for oil storage welding joint, this detection method is very accurate for the internal layer defects of oil tank, but ultrasonic detection is not suitable for the detection of thin-walled storage tank materials. Dye penetrant testing is only suitable for detecting the defects of the surface opening of API 650 welded tanks for oil storage and so on metal oil tanks. The feature of this method is convenient and fast.

The ring of API 650 welded tanks for oil storage annular plates shall have a circular outside circumference, but may have a regular polygonal shape inside the tank shell with the number of sides equal to the number of annular plates. These pieces shall be butt-welded in accordance with API Standard 620 R.7.1.1, Item b. The plates of the first shell course shall be attached to the annular bottom plates by welds as required by API Standard 620 5.9.5 except when a full penetration weld is used or required.

Selection of nominal diameter D of API 650 storage tank. In the design calculation of API 650 storage tank, the bottom plate thickness is the net plate thickness, that is, the actual thickness minus the corrosion allowance. In the design and calculation of API 650 welded tanks for oil storage wall thickness in hydrostatic test, the thickness of bottom plate is the total thickness of steel plate.

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