API 650 larger diameter tanks shell manholes and nozzles

API 650 is the standard for welded tanks for oil storage. It specifies the API 650 larger diameter tanks design, manufacturing, welding, inspection and installation requirements of oil tanks. API 650 is widely used in storage tanks with internal pressure less than or equal to 2.5 PSI.

Cylindrical Oil Storage Tanks Discharge Pipes
When a discharge pipe is used on the outlet side of such relieving devices, its area shall be not less than the area of the valve outlet, or if a single pipe provides for discharge from several relief devices, its area shall be not less than the aggregate area of the valve outlets. The API 650 larger diameter tanks discharge pipe shall be fitted with an open drain to prevent water or other liquids from lodging in the discharge side of the valves.
Discharge pipes shall be supported so that no undue stress is placed on the valve body. Open discharges shall be placed and oriented so that the outflow is directed away from the tank and will not create a hazard over walkways, stairways, or operating platforms.

The water dissolved in the oil will be separated out from the oil stored in the API 650 larger diameter tanks for a long time, and the acidic water layer will appear at the bottom of the API 650 larger diameter tanks for a long time, which will accelerate the corrosion of the API 650 larger diameter tanks and cause the wall thinning and even leakage. With the increase of service life, the API 650 larger diameter tanks must be inspected and cleaned regularly to check the hidden danger.

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