Gasket for steam pipelines
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I would like to ask whether asbestos rubber gaskets must be used for steam pipeline gaskets.
This question raised by the original poster has been discussed before; you can take a look at the links I provided: http://bbs.hcbbs.com/viewthread.php?tid=351553&highlight=%D5%F4%C6%FB%2B%B5%E6%C6%AC http://bbs.hcbbs.com/viewthread.php?tid=342939&highlight=%D5%F4%C6%FB%2B%B5%E6%C6%AC http://bbs.hcbbs.com/viewthread.php?tid=69377&highlight=%D5%F4%C6%FB%2B%B5%E6%C6%AC The overall link is: http://bbs.hcbbs.com/search.php?searchid=655&orderby=lastpost&ascdesc=desc&searchsubmit=yes
Asbestos gaskets have been used in the past and are still in use today; their main advantage is low cost. However, it is difficult to clean them thoroughly at the flange water line when replacing them. However, it’s better to use metal wound gaskets these days; they are more expensive but easy to use.
Asbestos rubber gaskets are suitable for applications with moderate temperatures and pressures; when the temperature exceeds 350 degrees and the pressure is above 4 MPa, metal wound gaskets are preferred.
It depends on the pressure and temperature of the steam being transported through the steam pipeline
In my opinion, asbestos rubber gaskets should be used for low-pressure steam, while metal wound gaskets are appropriate for medium-pressure or high-pressure steam
Use metal wound gaskets instead – it’s a one-time solution. Last edited by WSL01218 on 2009-3-6 at 12:33.]
Asbestos gaskets tend to leak during steam hydrotesting. Metal gaskets are ideal, but they are expensive; alternatively, PTFE gaskets can be used
For low pressure or temperatures below 140 degrees, PTFE-lined gaskets or PTFE gaskets can be used； It is best to use metal wound gaskets; asbestos gaskets tend to deteriorate easily when used again after being taken out of service (there are generally no problems if used continuously)
For LS and MS pipeline gaskets, the key requirements are good sealing performance, affordable price, and adequate pressure resistance. Strict requirements for HS pipelines. Because leaks are quite annoying.
Generally, flexible graphite composite gaskets are sufficient for low-pressure steam, wound gaskets are used for medium pressure, while metal gaskets and toothed gaskets are employed for high pressure.