ASTM A216 grade WCB external floating roofs API Std 650 carbon and low-alloy steel tanks

The bottom plate of the vertical API Std 650 carbon and low-alloy steel tanks directly contacts with the foundation soil, which is suitable for the flexible foundation, and its settlement characteristics are quite different from that of the rigid foundation. For the settlement calculation of the foundation of a vertical API Std 650 carbon and low-alloy steel tanks, the one-way compression layered sum method can be used. The calculation method is to divide the foundation soil into several layers of compression within the calculation depth of the foundation settlement, and then find the sum. The calculation method of the compression amount of each layer is the same as the calculation method of the compression amount under the condition of no lateral deformation.

Vertical storage tanks Security against Damage
The assemblies of relieving devices shall be secured against damage in service, the effects of storms, or mishandling. Access ladders and platforms that meet API Std 650 carbon and low-alloy steel tanks plant safety rules are suggested.
Vacuum-relieving Devices
A vacuum-relieving device, when used, shall be as direct in inflow as possible with no pockets where moisture can collect, and it shall have no piping except a weather hood ahead of the inlet. An adequate vacuum-air inlet shall also be provided.

The vent pipe mouth should be 4m or more above the ground. The nominal diameter of the API Std 650 carbon and low-alloy steel tanks API 650 petroleum storage tank vent pipe should be no less than 50mm and a flame arrestor should be installed.