6063 aluminum tube API 650 SUG II tanks

When the day light gradually decreases, the temperature of oil in the API 650 SUG II tanks will also decrease, the evaporation speed will gradually slow down, and the pressure in the API 650 SUG II tanks will also decrease. When the pressure in the API 650 SUG II tanks is lower than the negative pressure rating of the breathing valve, the outside air is sucked into the API 650 SUG II tanks through the open vacuum valve, which is the "suction" process of the oil tank.

Vertical storage tanks Security against Damage
The assemblies of relieving devices shall be secured against damage in service, the effects of storms, or mishandling. Access ladders and platforms that meet API 650 SUG II tanks plant safety rules are suggested.
Vacuum-relieving Devices
A vacuum-relieving device, when used, shall be as direct in inflow as possible with no pockets where moisture can collect, and it shall have no piping except a weather hood ahead of the inlet. An adequate vacuum-air inlet shall also be provided.

Welding certification is regulated by Section 10 of the American Society of Mechanical Engineers (ASME). For both API 650 SUG II tanks storage tank API 650, non-destructive inspection is required, but third-party inspection is not required.

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