CSA G40.21 Gr 260WT plates API Std 650 anchored tanks

Our company will set up a full-time service engineer for the project, who is responsible for the interface and coordination of technical support and after-sales service of the API Std 650 anchored tanks project. In response process of customer service center, in case of technical support and after-sales service demand, the user shall contact the full-time engineer of API Std 650 anchored tanks customer service center, and the technical personnel will give corresponding answers and on-site treatment according to the needs of users.

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

The horizontal projection of the roof plate within the compression-ring region is 4.9 x 0.866 = 4.25 in., which fulfills the requirement of API 620 tank standard 5.12.5.1. The required area and horizontal projection can be provided by any of the standard angles listed in Table F-3.
Any of these angles may be used in accordance with the details of Figure 5-6, detail a or b, but if details c, h, or i in Figure 5-6 were intended, the net area of the angle must be calculated by deducting the area expected to be lost by corrosion from that part of the angle surface that is exposed to the interior of the tank.