How to conduct pressure testing on this product
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Quote: “It is a single-tower type vessel with an inner diameter of Φ3520; the material used is 316L. The thickness of the cylinder wall is 8 mm for the lower 10-meter section and 6 mm for the upper 5-meter section. There are 25 trays inside the tower, each with a diameter of Φ3510. These trays are composed of multiple pieces that are connected to each other using bolts, and these pieces in turn are connected to T-beams via bolts. The T-beams are bolted to brackets welded to the inner wall of the cylinder. The unevenness of the trays is required to be within 4 mm, and there is only a 5-mm gap between the edges of the trays and the inner wall of the cylinder.” The test pressure for vertical tests is 0.065 MPa, and that for horizontal tests is 0.238 MPa. Please talk about the pressure testing plan for this product.
It is preferred to conduct a pneumatic test at the installation site; if a hydraulic test is used, foundation settlement must be taken into account. It also leads to water waste.
A horizontal pressure test should be conducted. If it’s installed vertically on-site, both pneumatic and hydraulic systems can be used. Our company has encountered this situation exactly: conducting hydraulic testing on horizontal vessels is very troublesome, as it involves changing the wall thickness. We have asked the Standards Approval Committee for answers, but still haven’t received any response. For details, see one of my posts at http://bbs.hcbbs.com/thread-407014-1-1.html
A pressure test isn’t something that can be carried out just like that! ! Please follow the pressure testing specifications outlined in the design drawings. The method of pressure testing should be determined at the stage of design, rather than trying to change it after manufacturing is complete for some reason^_^ For example, there are specified values for the welding joint coefficient! If for this equipment, the non-destructive testing ratio for certain butt weld joints is not 100% radiographic testing, then pressure testing is not permitted for this equipment.
According to the standards, a pneumatic pressure test is permissible when the design pressure is less than 0.6 Mpa. In terms of on-site construction, the method that is most convenient is used; therefore, the best approach is to carry out a pneumatic pressure test. The poster can search for more details on this topic within the forum
This device is poorly designed; its horizontal testing stiffness is insufficient, and under vertical testing, the hydrostatic pressure at a height of 15 meters is already higher than the test pressure. Such equipment does not require pressure testing; similar to the flue gas desulfurization towers in power plants, only a leak test for airtightness is needed, or kerosene can be used for leak detection.
I’m afraid this device isn’t for on-site construction, although work still needs to be done on site. I don’t think there’s any problem with pressure testing; if it’s possible, then carry out the testing, and if not, proceed with the horizontal testing, but in that case only the thickness needs to be checked. There are no other problems either; they’ve already told us the test pressure
Give it a try on-site; that’s how we used to do it.