Heat exchanger flange leakage
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For heat exchangers using high-temperature medium-pressure steam and facing frequent fluctuations in thermal load, leaks often occur at the gasket area – are there any good solutions? We originally intended to use high-temperature disc springs on the flange bolts, but given the high cost of these springs and the unpredictable effectiveness of them, we decided to abandon that idea.
Wrapping two layers of polytetrafluoroethylene around the gasket should suffice to seal it.
Reply to Floor 2: PTFE is not heat-resistant
Use a toothed washer or a high-temperature butterfly spring. It works well!
How high is the specific temperature? Rubber gaskets can be used at temperatures up to 300C. In this case, other methods can only be considered. The specific type of seal required depends on the temperature and the medium.
It is recommended to check the flange surface and clean the grooves, or replace the reference flange. It is possible that the flange surface is severely damaged. (For reference)
We used to have the same problem; some heat exchangers were difficult to seal properly, and due to high temperatures, leaks could occur over time. Combined with pressure fluctuations, if the medium does not cause corrosion, graphite gaskets can be considered for use in high-temperature, high-pressure steam environments. If the gaskets are installed evenly, leaks are generally unlikely to occur over an extended period.
It is recommended to use a \"wound gasket + ribbed surface,\" which should work
For the side that is to be taken over, expansion joints can be considered for connection
Try using a wave-toothed composite gasket; pressure fluctuations at high temperatures have a significant impact on bolts, so try to control the amount of variation in the load as much as possible.
High-temperature flanges are prone to leakage when there are sudden temperature changes. I wonder what type of gasket was used originally? Consider replacing it with a wavy toothed gasket or a high-strength graphite gasket
Based on the changes and direction of the thermal stress in the pipeline: 1. Adjust the pipe supports and hangers. II. Add expansion joints. III. Replace the metal gasket.