A516 grade 380 plates API Std 650 cylindrical tanks

API Std 650 cylindrical tanks, Oil tank is a large-scale storage equipment used to store oil materials. Usually, the service life of API Std 650 cylindrical tanks is related to the actual working conditions. The design service life of most oil tanks is 20 years, and some of them are 10-15 years. Generally, none of them is less than 10 years. However, the design service life of API Std 650 cylindrical tanks is on the one hand, which is an ideal state, but there are many objective factors in the actual process, it is impossible to achieve the designed service life. How to effectively increase the service life of API Std 650 cylindrical tanks?

Allowable Design Stresses
The maximum allowable design stresses for the API Std 650 cylindrical tanks materials outlined in Q.2.1 shall be in accordance with Table Q-3.The values for the allowable design tensile stress given in Table Q-3 for materials other than bolting steel are the lesser of (a) 331/3% of the specified minimum ultimate tensile strength for the material or (b) 662/3% of the specified minimum yield strength, but they are 75% of the specified minimum yield strength for the stainless steel, nickel alloy, and aluminum materials. Allowable test stresses are based on the limitation of API 620 oil tank storage standard Q.8.1.3.

The floating roof is the top cover floating on the liquid level, so the sealing performance of API Std 650 cylindrical tanks API 650 oil storage tank is very important. The floating plate mainly adopts elastic packing, and at the same time, it is compressed with the wall of API 650 oil storage tank with pressure strip around, and fixed with the floating plate with bolts. After the API Std 650 cylindrical tanks floating plate is lowered to a certain position of about 1.8m, a prop will support the floating plate to keep it in position.