【Weekly Topic】November Issue 1: Heating for instrumentation and controls?
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Hello, everyone. This week’s topic of discussion is related to \"heating for instruments in installations\". The main points to be discussed are as follows: Instruments in various installations are equipped with heating systems; as for the pressure tapping pipes, what diameter do the heating tubes used for these pipes have? Sometimes, the chosen diameter is too small, resulting in condensate water not being able to flow into the condensate drainage system. How should this situation be addressed? What are the precautions for using heat tracing on instruments? I hope everyone will actively participate in the weekly topic discussions and propose new topics; 10 to 50 points in wealth will be awarded once such topics are adopted, so please get involved actively. I invite all sea friends to engage in active discussions on this issue. For excellent responses, I will give higher scores and award wealth rewards ranging from 10 to 50 based on the quality of the replies; for proactive contributions to the discussion, rewards of 5 to 10 in wealth will be given. I hope everyone will participate actively! I hope everyone can learn something from this exchange Everyone is encouraged to participate! Dear sea friends, please engage in active discussions; feel free to share any new insights you may have! The focus is on participation; feel free to communicate!
For processes that are relatively short or have many bends, DN15 may be used, but DN20 is probably the most commonly used. Heating for DN25 is also available, but it is basically not used for heating instruments.
Instrument heating is difficult to maintain. For areas where it is inconvenient to introduce steam, or for more important instruments, electric heating is a better option.
All of us use instrument heating in our systems. As for the instrument heating tubes used for some pressure transfer pipes, what is the diameter of these tubes? Sometimes a smaller diameter is chosen, and as a result, the condensate water cannot make it into the condensate drainage system. How do you deal with this situation? ----I’ve seen cases where the condensate water is discharged directly, as it cannot be sent back. What are the precautions to take when using heat tracing for instruments? Ensure flow; the heat tracing must be complete, with no dead zones
Electric heat tracing requires a power source. How should electric heat tracing be handled in explosion-proof areas?
I have used heat tracing pipes of DN15, DN20, and DN25. For some small tubes, such as those for pressure measurement and drainage, they can be made slightly larger from an anti-condensation perspective; for example, the minimum diameter should be no less than 2''.
With DN10 heat tracing, it’s almost impossible for condensate to enter the pipeline network
DN15 and DN20 are generally used; the heat-traced condensate can be discharged through a separate pipe to ensure an effective heating effect.
Water heating provides a better heating effect than steam heating; in the past we used steam heating, and freezing of the heating system was a common problem in winter. It was later changed to hot water heating, so freezing of the heating system became very rare.
For dashboards with temperatures over 1,000 degrees, steam heating is used. At present, many petrochemical plants in the north rely more on water heating; its advantage is smooth circulation and reduced risk of freezing of the heating pipes, resulting in better performance compared to steam heating.
DN20 is generally used. . . . . . . . . . . . . . .