Regarding the pipeline purging issue in heat transfer oil furnaces
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The company has installed a heat transfer oil furnace, which uses liquefied gas as fuel. After the pipeline from the heat transfer oil furnace to the heat exchanger is installed, water is used to pressure-test the pipeline. According to the manufacturer’s requirements, the pipes must be free of water; currently, instrument air is being used to purge the pipes, but it seems that the effect is not significant and the purging speed is slow. So here comes the question: 1. Is it possible to ignite the furnace with a small amount of liquefied gas, and to use instrument air or nitrogen to purge the heat transfer oil pipelines? 2. What are the effects of water in the heat transfer oil pipeline?
The presence of water in the heat transfer oil pipeline has little impact; it just means that the heat transfer oil dries more slowly
The heating time for the oil needs to be much slower; it depends on the size of the furnace. The temperature must rise gradually during the oil heating process. In this case, you can call the manufacturer of the heat transfer oil you use to request technical support – you don’t need to worry about it yourself.
The technician sent by the manufacturer said that there must not be any water in the heat transfer oil pipes. I asked what criteria needed to be met for the sampling analysis, but the manufacturer couldn’t say for sure. That’s why I turned to Haiyou for help.
New heat transfer oil must have its water removed, and the system is equipped with an oil-water (vapor) separation device.
Is there no dehydration? Empty the tank, use an oil pump to create circulation, and heat while removing moisture. Water definitely has a much lower boiling point than heat transfer oil
I guess you bought oil from a small manufacturer; no legitimate manufacturer would tell you that there shouldn’t be any water in the pipes. If you buy my oil, I’ll tell you how to remove the water – it’s a very simple process. It’s impossible to have absolutely no water in the pipes, as there is always some water in the air anyway, haha. This manufacturer is full of nonsense – just remove the water and that’s it. Does buying his oil mean that the pipes will become unusable if there’s water in them? Come on, you can contact me; even if I didn’t sell you the oil, I’ll still help you heat up the system.
If conditions permit, perform purging of your new system; instrument air definitely won’t work as its pressure is too low. It’s best to use nitrogen gas with sufficient pressure. The key is to conduct a pressure test to check for any leaks in the system – stability of pressure is what matters. Also, remove any slag and impurities from within the system, usually by cleaning them through the filter. You can also carry out a pressure test while the system is in cold operation, using oil to flush out the impurities and send them to the filter, then checking for leaks. Be sure to clean the filter and release any air from it, and gradually increase the temperature once the pressure is stable.
Well, thank you. The oil is now being heated.
You’re welcome. Feel free to contact me if you have any questions; my QQ number is on my profile picture
Is it appropriate to use water for pressure testing a heat transfer oil system?