Design and construction requirements for API standard 650 low-alloy steel tanks

Oil tank accessories are an important component of metal oil tanks. Common accessories of API standard 650 low-alloy steel tanks include manholes, light holes, oil measuring holes, breathing valves, safety valves, and fire extinguishers. The functions of these accessories are different. Some are to ensure the storage quality of various oil products, some are to ensure the normal operation of oil products receiving and dispatching, and some are to ensure the safety management of API standard 650 low-alloy steel tanks, etc.

The increased uplift described in API Standard 620 tank Appendix Q is intended to apply to the size of the ringwall and foundation but not the anchorage. For tanks with an internal design pressure of 1 lbf/in.2 gauge and over, the uplift, if any, shall be calculated under the combined conditions of 1.25 times the internal design condition plus the design wind load on the API standard 650 low-alloy steel tanks shell and roof.

This API 650 tank standard does not present orstablish a fixed series of allowable tank sizes: instead, it s intended to permit the purchaser to select whatever size API standard 650 low-alloy steel tanks tank may best meet his needs.