Standards for vertical storage tanks
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As shown in the figure below, with a design pressure of 0.09 MPa, should the applicable standard be NB47003.1 (Steel Welded Atmospheric Pressure Vessels) or GB50341 (Code for Design of Vertical Cylindrical Steel Welded Oil Tanks)? ? In my opinion, the design pressure of this device does not comply with the requirements of 50341; instead, 47003.1 should be followed. In that case, is it necessary to conduct a vacuum chamber test on the device’s base plate?
For such atmospheric pressure storage tanks, the volume is the main factor to consider. Generally, for volumes of 100 m3 or less, it can be manufactured in a factory or installed on-site. It is generally designed according to 47003.1; a thickness can be selected based on experience. If we have to calculate it according to 50341, this thickness is also acceptable. As for the tank bottom plate, for tanks of 100 m3 or less, the diameter is very small, and its structure differs from that of large storage tanks. It’s just a flat-panel connection. For small diameters, there is only one butt weld, and RT inspection can be performed to check the quality of the weld.
Thank you for your advice. Also, if we go with 47003.1, under what circumstances should we conduct a water filling leak test, and under what circumstances should we use water pressure testing? ?
Thank you for your advice. Also, if we go with 47003.1, under what circumstances should we conduct a water filling leak test, and under what circumstances should we use water pressure testing? ?
The standard for atmospheric pressure vessels does not specify a flat-bottom design; for small atmospheric pressure tanks, that is simply how it is described. Regarding the diagram provided by the original poster, I personally feel that the pressure value specified is a bit too high; it does not fall within the range specified by GB50341. SH/T3167-2012 is relatively in line with the equipment parameters of the original poster.
The standards for atmospheric pressure vessels do not exclude this structure.
Even if we don’t consider the design pressure to be that high, just the operating pressure of 0.03 already exceeds the range of 50341, right?
The design pressure exceeds GB50341; therefore, GB50341 cannot be used for design, and design should be carried out in accordance with NB47013.1. For testing for leaks by filling it with water, the structure of the tank bottom can follow the standards specified in GB50341; tests should be carried out in accordance with its relevant requirements!
Also, the design pressure set by the original poster is a bit high