Urgent help needed – urgent request regarding high-pressure sealed elliptical gaskets! ! !
Thread Content
A high-pressure filter designed by our company has a design pressure of 35 MPa and a design temperature of 280 degrees. The flanges and covers are made of 16MnⅣ, while the gaskets are elliptical gaskets made of S30408Ⅲ with ring size R68. However, the customer disagrees with this design; the dimensions of the elliptical gaskets specified in Appendix C of GB150 are the same as those in HG/T20633, but according to HG/T20633, the R68 model can only be used for PN20 applications. I would like to ask for advice. . . . . . Is this oval pad usable? If not, which size ring should be chosen?
Ugh, I have to handle this by myself – why isn’t there anyone discussing it? Using the R68 elliptical pad, the calculation shows it is feasible.
The last edit to this post was made by zjq1962 on 2019-4-20 at 16:13. As I understand it, Table 4-1 in HG/T20663 is merely a table showing the corresponding selection of rings and flanges; it indicates which gasket size should be used based on the pressure class of the flange (i.e., the ring gasket size is determined by the flange), but it does not mean that the ring gasket can only be used for that specific pressure class. The pressure and temperature at which gaskets can be used depend only on their structural design and material, not on the ring size. If your calculation shows it’s possible to pass, then there’s no problem.
For other types of gaskets, such as wound gaskets with a pressure rating of PN16, can they also be used in high-pressure applications, as long as the calculations show it is feasible?
This post was last edited by zjq1962 on 2019-4-20 at 16:28. There is also an issue regarding design rationality.
I’ve encountered similar problems before: the design pressure is 1.8, and the equipment flanges are based on a standard of PN1.6 MPa; standard gaskets are used as well. The customer asked me whether those PN1.6 gaskets would be suitable Agree with the second floor; it’s fine! :lol
Thank you to all the experts for their guidance. Although the calculation passed, there is still no water pressure. Because after the Xiangshui incident, everyone is quite nervous, and customers are very cautious in this regard, not wanting any accidents to happen.
It is recommended to use 20633, the ring number corresponding to 42 MPa
This is beyond the range; it definitely can’t be used. The sealing structure needs to be changed