A841 Gr A Cl 1 plates API 650 open top welded storage tanks

Oil tank accessories are an important component of metal oil tanks. Common accessories of API 650 open top welded storage 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 650 open top welded storage tanks, etc.

In this project, a cylindrical tank 62 ft 6 in. in diameter is designed for an internal pressure of 4 lbf/in.2 gauge in the vapor space. The plate material is ASTM A131 steel with appropriate grades for different plate thicknesses in accordance with Table 4-1 for a design metal temperature less than 65°F but not less than 25°F. No corrosion allowance is required for any portion of the tank. The top course of the butt-welded cylindrical sidewall is 1/4 in. thick. The roof is a single lap-welded spherical dome with an internal radius of 50 ft and a thickness of 1/4 in. The maximum design liquid level is 6 in. below the plane of the juncture of the tank API 650 open top welded storage tanks roof and sidewall.

The vent pipe mouth should be 4m or more above the ground. The nominal diameter of the API 650 open top welded storage tanks API 650 petroleum storage tank vent pipe should be no less than 50mm and a flame arrestor should be installed.