Selection of design pressure for jacket volume
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There is a design issue regarding the maximum operating pressure of the inner cylinder: the vacuum level is 0.06 MPa, while the maximum operating pressure of the water in the jacket is 0.3 MPa. Therefore, the design pressure for the inner container should be X MPa, and the design pressure for the inner jacket should be Y MPa. The hydrostatic test pressures should be Z MPa for the inner container and W MPa for the jacket. Please let me know what these values should be.
If the temperature does not exceed 150, the design pressure for the inner vessel is -0.1 MPA, while the design pressure for the internal jacket is 0.33 MPA. The hydrostatic test pressures are 0.13 MPA for the inner vessel and 0.42 MPA for the jacket.
Refer to Article 4 of HG20580-1998. Additionally, the poster should specify the maximum operating temperature and material, as well as whether there are safety relief devices or not. This post was last edited by tianyali on 2009-3-20 10:45]
For the design of the inner cylinder, the external pressure is taken as 0.1 MPa assuming no safety relief device is present; the design pressure for the jacket is 0.33 MPa, while the calculated external pressure for the inner cylinder is 0.43 MPa. The test pressure for the inner cylinder is set at 0.125 MPa, while the test pressure for the jacket is set at 0.413 MPa.
Agreed. Additionally, the instability of the inner cylinder should be checked based on an external pressure of 0.43.
(1) Design pressure: 0.1 MPa for the inner cylinder, 0.3 MPa for the jacket. (2) Calculated pressure: 0.1 MPa for the upper head of the inner cylinder, 0.4 MPa for the lower head of the inner cylinder, 0.4 MPa for the jacket. (3) Hydrostatic test pressure: 0.2 MPa for the inner cylinder, 0.375 MPa for the jacket. These are the answers to my previous question; I wonder whether, for vacuum vessels, the design pressure is always set at -0.1, without taking external pressures into account? Why is the test pressure for the inner cylinder 0.2 MPa? Is it necessary to apply pressure to the inner cylinder during the jacket test to prevent it from deforming? What pressure is needed to prevent deformation?
The value of the internal cylinder pressure is to be determined in accordance with B150-3.5.1. As for whether pressure is needed to prevent deformation of the internal cylinder, a stability analysis must be conducted
Sorry, it’s GB150