Hydraulic testing of atmospheric pressure vessels
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Do atmospheric pressure vessels require a hydrostatic test, and if so, what should be the test pressure?
A hydrostatic test is required; for vertical storage tanks, it is sufficient to fill the tank with water, and the same should apply to horizontal tanks as well.
This post was last edited by flute6 on 2010-12-8 at 13:41. For atmospheric pressure storage tanks, water is filled up to the angle steel ring (i.e., the height of the tank wall). When the specific gravity of the stored medium is greater than 1, the filling height is equal to the tank wall height multiplied by the filling coefficient multiplied by the specific gravity of the stored medium. For pressure vessels at normal pressure, the water filling test is carried out in accordance with Section 9.7 of NB/T 47003.1-2009 (JB/T 4735.1).
?: The specific gravity of 32% alkali is 1.35, and that of 48% alkali is 1.5. So how should the water filling height be determined? According to the formula \"water filling height = tank wall height × filling coefficient × specific gravity of the storage medium\", the water filling height would be much higher than the tank wall height. What should be done in this case?
Reply to 4# rctx97: Add pipes on top of the tank
Reply 5# flute6: Is that what the standards say? Could you provide an electronic version of NB/T 47003.1-2009(JB/T 4735.1)?
Reply to 6# rctx97: Convert it using specific gravity before refilling; if the water level allowed is insufficient, add some compressed air accordingly. NBT 47003.1-2009 Steel Welded Atmospheric Pressure Vessels http://bbs.hcbbs.com/viewthread.php?tid=707972&highlight=NBT%2B47003.1-2009%2B%B8%D6%D6%C6%BA%B8%BD%D3%B3%A3%D1%B9%C8%DD%C6%F7
Reply to 7# flute6: There is another question: during the hydraulic testing of normal storage tanks, the settlement of the foundation is also monitored. For tanks with a high specific gravity, whether pipes are added or pressure is applied, the weight cannot reach the level it has during operation. I wonder how it was handled on site?
It is stated that \"when the specific gravity of the storage medium is greater than 1, the water filling height is equal to the tank wall height multiplied by the filling coefficient multiplied by the specific gravity of the storage medium.\" ” The sulfuric acid tank is quite heavy, so it shouldn’t be easy to do this, right? Should the hydraulic test be carried out by filling it with water up to the angle steel frame? When specifying requirements for civil engineering work based on the process requirements, emphasis is placed on the operational demands; the foundation must be constructed in such a way as to meet these operational needs. The local settlement during hydraulic pressure testing should also remain within the limits specified by the standards.
Reply to 8# rctx97: For media with a specific gravity greater than 1, a rigid foundation is recommended, namely a reinforced concrete slab. For highly corrosive media, a strip-shaped rigid foundation is used for the tank foundation, with I-beams placed under the tank bottom plate to support it on the strip-shaped concrete foundation.
After the overall acceptance of the atmospheric pressure storage tank, a hydrostatic test is required, usually by filling it to a safe height.