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A best practice before starting up a new thermal oil system is to take a sample from a low point drain into a glass jar. A murky sample indicates the presence of water in the fluid which has to be eliminated by performing a system boilout. A rust colored or clear layer at the bottom of the jar indicates pure water. The time required to thoroughly boilout the system can be reduced by draining the excess water from some of or all the low point drains.

An important point to be noted here is that even if water is not seen in the sample, some amount of residual water might be hidden in the system.

Upon conversion to water vapor, the volume of water is expanded to more than 1100 times, making it highly impossible to be ignored in a closed-loop thermal fluid system.

Following are some of the indicators for the presence of water:

Water remaining in the thermal oil system is not purged out when the system is operated at low heat until stabilization of the pump pressure. Conversely, the residual water is only relocated to the bottom of the expansion tank. Therefore, the sole method by which water can be entirely removed is by forcing it to flash off as water vapor through the vent of the expansion tank.

It is important to note that in the case of a severely contaminated thermal oil system, it is advisable to completely replace the fluid. Although this process may not avoid the need for a boilout, it can minimize the needed time.

Below are some of the points to be followed for rapidly performing boilout of a system:

Invariably, water contamination is mostly self- inflicted. Therefore, the following points should be followed for preventing contamination by water.

This information has been sourced, reviewed and adapted from materials provided by Paratherm.

For more information on this source, please visit Paratherm.

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we have HTF with water mixed during the operation from heat exchanger. Normally any hydrocarbon fluid is at top and water is in bottom. What about HTF water at bottom or top? How much water observe in PPM naturally? What is the acceptable limit of PPM in HTF? Did HTF get contaminated with water dew to humidity if its standing in tank for week or more?

The opinions expressed here are the views of the writer and do not necessarily reflect the views and opinions of AZoM.com.

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