A678 Gr B plates API Std 650 unanchored flat-bottom tank

Oil storage tank with floating roof structure: The floating roof in the API Std 650 unanchored flat-bottom tank oil storage tank can effectively reduce the volatilization consumption of oil, because the gas space on the oil liquid surface in the floating roof storage tank is small, the exhaust volume is low, and the breathing loss is very small. That can reduce the volatilization loss caused by the "big breath" of the API Std 650 unanchored flat-bottom tank. Strengthen the inspection and maintenance of API Std 650 unanchored flat-bottom tank: regularly check the sealing conditions of oil storage tanks, and check and maintain important auxiliary equipment to ensure good sealing performance.

Materials for API Std 650 unanchored flat-bottom tank primary components shall comply with the requirements of Tables R-1 and R-2. All primary components shall be impact tested in accordance with R.2.1.2 through R.2.1.4. Impact testing of API 620 welded storage tanks plates, including structural members made of plate, shall comply with Table R-1. Impact test specimens shall be taken transverse to the direction of final plate rolling.

API 650 petroleum storage tanks are used for API Std 650 unanchored flat-bottom tank storage. API 650 petroleum storage tanks can be made of carbon steel, austenitic stainless steel and nickel alloy (only for low temperature). Welding API Std 650 unanchored flat-bottom tank certification is regulated by Section 10 of the American Society of Mechanical Engineers (ASME). For API 650 petroleum storage tanks, non-destructive inspections are required, but third-party inspections are not required.