A516 Gr 450 plates API Std 650 tanks

API 650 petroleum storage tank basic knowledge, storage tank concept and use: API Std 650 tanks storage equipment for storing crude oil, gasoline, kerosene, petroleum and various non-volatile chemicals, API 650 petroleum storage tank is a storage and transportation system facility, oil refining, chemical industry An important part of the device.

The water dissolved in the oil will be separated out from the oil stored in the API Std 650 tanks for a long time, and the acidic water layer will appear at the bottom of the API Std 650 tanks for a long time, which will accelerate the corrosion of the API Std 650 tanks and cause the wall thinning and even leakage. With the increase of service life, the API Std 650 tanks must be inspected and cleaned regularly to check the hidden danger.

The thickness of the API Std 650 tanks annular bottom plates shall be in accordance with Table Q-4 (for steel or aluminum, as applicable). The thicknesses shown are minimums. The ring of annual plates shall have a circular outside circumference, but it 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 Q.7.1.1, Item b. The plates of the first shell course shall be attached to the annular bottom plates by a weld as required by API 620 oil tank 5.9.5 except when a full-penetration weld is used or required (see Q.7.1.1). Butt-welds in annular plates shall be not closer than 12 in. from any vertical weld.

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