35ft diameter API Std 650 unanchored flat-bottom tank
Standard API 650 tank calls for calculations based on the specific gravity of the liquid product being stored. This permits the thickness of the steel API Std 650 unanchored flat-bottom tank needed as well as other specifications of how the tank is built to be determined by the weight of the API 650 tank.
Foundations and subgrade shall safely carry the weight of the tank API Std 650 unanchored flat-bottom tank and its contents when the tank is filled with water to the highest level required for a hydrostatic test or other water-loading operations, even though the tank itself may be designed for some lesser density of liquid. However, in cases where the character of the soil justifies it and a competent soil expert advises it, allowance may be made for the relatively short duration and intermittent nature of the water loadings if suitable account is taken of all such loadings that may be expected to occur during the life of the tank, including not only those loadings that are incidental to periodic repetitions of the hydrostatic test in accordance with 7.18 but also water-filling operations for gas-freeing purposes.
Unqualified welding quality of API Std 650 unanchored flat-bottom tank is prone to hidden dangers such as oil tank steel plate cracks and leakage. To avoid this situation as much as possible, it needs to be avoided when the oil storage tank is manufactured. Scientific and reasonable measures are adopted to control the welding quality when welding the API Std 650 unanchored flat-bottom tank. How to reasonably control the welding process quality of oil storage tanks?
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