API standard 650 unanchored flat-bottom tank structural period of vibration

For all API 620 crude oil tank other materials, the impact test temperature shall be at least 30°F colder than the design metal temperature. Alternately, materials impact tested at the design metal temperature or lower with Charpy impact test energy value of 25 ft-lb (average), 20 ft-lb (minimum) are acceptable for design metal temperatures above –40°F. API standard 650 unanchored flat-bottom tank materials with an energy value of 30 ft-lb (average), 25 ft-lb (minimum) are acceptable for design metal temperatures of –40°F or lower.

API 650 internal floating roof API standard 650 unanchored flat-bottom tank tank can be used to store gasoline, jet fuel and other volatile oil products, as well as aldehydes, alcohols (methanol, ethanol), ketones (acetone), benzene (benzene, toluene, xylene, styrene) and other liquid chemicals.

When encountering heavy rain or continuous heavy rainfall, the safe operation of API standard 650 unanchored flat-bottom tank will be affected. For example: the API standard 650 unanchored flat-bottom tank is submerged, the oil unloading valve and the flame arrester valve are broken by water and the oil tank leaks. The oil tank area must do emergency work to prevent rainstorm to ensure the safety of the oil tank. Here are some safety protection measures for API standard 650 unanchored flat-bottom tank in heavy rain.