Installation of reinforcement rings on jacketed (stirred) containers
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There is a jacketed (with stirring) vessel, the inner cylinder is made of stainless steel, operating at atmospheric pressure, with a flat cover end； The jacket is made of carbon steel, 0.4 MPa ； During strength calculation, the strength of the inner cylinder meets the requirements; however, for the jacket hydrostatic test, a pressure retention of 0.03 MPa is required ； Since the upper head of the inner cylinder is a flat cover head, pressure retention is not possible; therefore, a reinforcement ring must be installed ； Furthermore, since the jacketed vessel is equipped with stirring equipment, the presence of reinforcing rings inside the inner cylinder affects the stirring efficiency ； A reinforcement ring can only be installed between the jacket and the inner cylinder. The medium inside the jacket is liquid; to improve heat transfer, spiral guide plates can be used simultaneously as reinforcement rings ； However: Spiral reinforcement rings are difficult to manufacture and require a large amount of welding ； Thus, an idea arose: could a temporary reinforcement ring be installed inside the container for use during the hydrostatic test, and removed after the test? Experts, please give me some advice!
No. If that’s the case, then it’s better not to conduct a hydrostatic test. You probably don’t understand the purpose of a hydrostatic test...
The jacket hydrotest is used to test the jacket, while the inner cylinder is the one that suffers.;P； The inner cylinder should be able to withstand the design pressure of the jacket, right?
The hydrostatic test is also carried out as needed; if it isn’t necessary, it can be skipped. Besides, this hydraulic test for the jacket should pass, as long as the welds inside and outside the head flange are strengthened.
For this 0.03, it’s really a huge hassle. . .
"Install a temporary reinforcement ring for use during the hydraulic pressure test, and remove it after the test.\"? You should know that the hydrostatic test is the final step......
If that doesn’t work, then reduce the corrosion allowance; for the inner tube made of stainless steel, two values are used for the corrosion allowance. The medium inside the inner cylinder is lithium hydroxide, while the medium in the jacket is ethylene glycol (which has good corrosion resistance). Changing the corrosion allowance to one will do just fine.
This situation comes up frequently; what I do is increase the thickness of the inner tube wall and add temporary reinforcement rings. In case the workers make a mistake and the pressure in the jacket becomes too high, the inner tube might become unstable, and it would be difficult to know what to do then. We have encountered such problems before