Negative pressure wall thickness calculation
Thread Content
When calculating the negative pressure of the container, there is a formula for calculating the external pressure. It is said to be in GB15.1, but I haven't found it. Can any expert explain it? How to calculate this external pressure? Is it the degree of vacuum? Thanks!
Negative pressure requires calculation of stability. Stability is actually judged based on stress. However, the allowable value of stress is much smaller than that of positive pressure.
There is a textbook on process equipment design, turn it over
There is a chart method introduced in GB150. First calculate the strain A, and then check the critical stress B.
This post was last edited by zjq1962 on 2019-3-7 08:15. If you look at the attached picture, it will be clear how to determine the calculated pressure. Several people upstairs confused the calculated pressure with the allowable external pressure.
The design of the negative pressure tank is based on the full pressure design. The full pressure difference is one atmospheric pressure + the pressure of the process conditions + the margin specified by the standard.……