ASTM A216 grade WCA external floating roofs API Std 650 mixed material tanks

The inner layer of API 650 tank is the same as that of single layer tank. It is made of high-quality steel plate in strict accordance with the standard of "steel welded atmospheric pressure vessel". The thickness of API Std 650 mixed material tanks steel plate reaches the standard and the service life is longer.

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

The materials used in the construction of Appendix Q oil tanks may be subject to severe pitting, cracking, or rusting if they are exposed to contaminated test water for extended periods of time. The Purchaser shall specify a minimum quality of test water that conforms to Q.8.3.2 through Q.8.3.8. After the water test is completed, the tank API Std 650 mixed material tanks shall be promptly drained, cleaned, and dried.

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