Leakage problem of heat transfer oil gaskets used intermittently
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{:3_55:} It’s an intermittent distillation tower; the heat is supplied by a coiled tube filled with heat transfer oil inside the reactor. The distillation temperature is around 230°C. Graphite and rock wool gaskets cannot be used for the sealing – they will start leaking within a month. Are there any other types of gaskets that can be used? That’s the state of the equipment. . .
Is it definitely a problem with the gasket? Has heat-shrinking been done? Are there spring washers on the bolts? A slight leakage of some heat transfer oil can cause coking, after which there is no more leakage.
It is recommended to use high-temperature resistant metal wound gaskets. It is quite applicable.
Consider using spring bolts. . . Let’s consult first. . .
Your description of the situation is incomplete, making it impossible to draw an accurate judgment. It is recommended to consider the following three aspects: Operating conditions: Is there any temperature variation, and what is the frequency? Gaskets and sealing surfaces: 230°C; using flexible graphite should not pose a problem. Are the rebound and compression properties of the gaskets satisfactory? What type of gasket was used before, a sheet material? Coiled gasket? Toothed gasket? Anything else? Is the gasket installed correctly? What’s the condition of the sealing surface? Fasteners: Is the pre-tightening force of the fasteners adequate? Are there any measures to prevent bolt creep and relaxation? For your reference; I hope it can help you. Further discussion is welcome
{:3_57:} It is turned on and off once a day; the temperature is around 100 degrees at low levels and 230 degrees at high levels. Graphite gaskets were used in the past, but they couldn’t hold up either and started leaking after just one month. To prevent leaks, reinforced bolts are used, and when leakage occurs, employees will tighten the bolts right away
It seems that metal-wrapped graphite gaskets should be used, such as 304 graphite-wrapped or 321 graphite-wrapped ones
In my opinion, this situation is likely due to the creep of the bolts and gaskets caused by temperature fluctuations. Recommendation: Graphite wound gasket + disc spring.