Crystallization issue at the root valve of the instrument
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This post was last edited by zyzs on 2011-1-12 at 19:53. Regarding crystallization at the root valve of instruments, we usually apply heat tracing, but it seems to not be very effective – crystallization still occurs. Steam heat tracing is used; should the heat tracing tubes be wrapped around the root valve? What measures do you take when encountering crystallization?
Apart from heat tracing, there really isn’t much else that can be done. Otherwise, use a hot water hose for timed flushing.
The reasons for crystallization are nothing more than temperature and concentration, or other interfering factors; you can address this issue based on the properties of the medium.
Other than heat tracing, it’s probably still heat tracing. . . . . .
We are still using heat tracing~~~~
We use heat tracing as well, electric heat tracing, but crystallization still occurs when the temperature is extremely low!
Steam tracing involves wrapping steam copper tubes around the root valve and covering them with insulation material on the outside. Is it the poor quality of the steam that results in inadequate heat tracing?
OP, as you mentioned, using steam heating tubes or electric heat tracing for insulation won’t help with the crystallization at the base of the valves, because such insulation methods may not cover the entire area; some parts will remain unheated, which can lead to crystallization. I recommend using a dedicated control valve with a steam jacket, as it works well; I have used it and it’s effective.
Reply to 9# king70868: Yes, there are HTJ insulated jacket single-seat control valves produced by Wuzhong Instrumentation. It can be found online.
For crystallization, options such as heat tracing (electrical or steam heat tracing), purging (with gas or liquid), and the use of special instruments like the steam jacket mentioned earlier can be considered; however, these methods are rarely used