Are there any specifications for the roundness of horizontal buried tanks?
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Horizontal buried tank, with a diameter of 3000 mm and a length of 15000 mm. The circularity of the tank body was measured; the major diameter is 3045 mm and the minor diameter is 2950 mm. Is this shape acceptable? Also, I have a question: what types of equipment are considered to be under external pressure? Are there any standards regarding the pressure applied in such cases? The design pressure for these buried tanks is 3 to 0.6 kPa. Thank you
Buried storage tanks require consideration of various stress conditions such as the external pressure from grouting and the buoyancy of groundwater
It shall meet the requirements for external pressure vessels as specified in GB150.
With such a low design pressure, it does not fall under the category of pressure vessels; it should be designed in accordance with the standards for vessels at normal pressure. However, its roundness deviation is too large – we need to see what the standards specify in this regard.
It fails to meet the requirements for external pressure vessels as specified in GB150.
According to the requirements for pressure vessels under external pressure, then does this tank fall under the category of pressure vessels under external pressure? Are external pressure vessels defined?
Personal opinion: When the vacuum degree is higher than or equal to 0.02 MPa, the requirements for pressure vessels specified in GB/T150 should be followed...
The design pressure for buried tanks is 3~0.6 kPa; 0.02 MPa = 20 kPa, which is greater than 3~0.6 kPa. Does this not meet the requirements for pressure vessels as specified in GB/T150?
For horizontal buried tanks, both external pressure and internal pressure need to be taken into account. The external pressure is determined by the depth of burial; if external pressure is the dominant factor, it is best to manufacture the tank in accordance with GB/T150. On the other hand, if internal pressure is the dominant factor, the appropriate standard to follow depends on the pressure level – whether normal pressure or GB/T150 applies. As long as their roundness meets the corresponding manufacturing standards.