Hot tightening temperature for sulfur recovery unit startup
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I would like to ask the experts here: how do you determine the thermal tightening temperature for starting up sulfur recovery units?
Heat and tighten it when the temperature is above 200 degrees.
What is heat setting temperature? I have a question: L :L
Same floor, asking about the heating temperature! :L
200 degrees refers to the system temperature; due to the principle of thermal expansion and contraction, the bolts will loosen at this temperature and need to be tightened again. Otherwise, after the system returns to normal operation, air and oil leakage will occur.
Our approach is to perform heat tightening twice: once when the temperature at each point reaches around 250°C. Second, the system is thermally tightened a second time once it reaches the operating temperature.
The temperature is around 200. I’m not the one who does this work; I heard about it from a friend
It seems that everyone follows a similar approach: for systems with an operating temperature above 250 degrees, thermal tightening is carried out in two stages – at 250 degrees and at the actual operating temperature. For systems with an operating temperature between 150 and 250 degrees, thermal tightening is performed once, when the system reaches its operating temperature. However, we haven’t found any specific evidence to support this!!!
Does that mean all thermal systems need to be thermally tightened? Is there any cold tightening? Do we need to do all these things when production starts?
Once at over 200 degrees, once at 350 degrees
Regarding the requirements for thermal tightening and cold tightening, for detailed information please refer to GB50235-97, Code for Construction and Acceptance of Industrial Metal Piping Projects. Contact me if you need the standard; it’s too large to be uploaded.
Constant-temperature thermal tightening when the furnace temperature of the sulfur production furnace rises to 600 and 1200°C