It is recommended to replace the heat transfer oil every six months
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Many users find that, over time, heat transfer oil can develop scaling, or its color may turn black (it’s normal for the oil to darken when it enters pipes due to impurities present in those pipes). In fact, these are merely superficial issues as long as the heat transfer efficiency is not affected. Before new heat transfer oil is put into use, it must undergo a dehydration process; only after the water has been removed can the oil’s temperature be increased. As long as the heat transfer oil is replaced regularly, scaling will not occur. It is generally sufficient to replace the oil once a year; if financially feasible, it can be replaced every six months, although this results in higher costs. If only the oil in the heat transfer oil furnace needs to be replenished, there is no need to remove the old oil from the system – simply add the new oil ； However, if the heat transfer oil in the heat transfer oil furnace is to be replaced, the old oil currently in the system must first be completely drained before new heat transfer oil can be added. We still recommend that you decide based on the usage of the equipment; it is best to replace the heat transfer oil every six months. This not only ensures that the heat transfer oil functions optimally but also benefits the maintenance of the equipment.
OP, you must be really rich to change the heat transfer oil every six months. It’s quite troublesome to do that; the oil can deteriorate prematurely. It’s better to first check whether there are any issues with the heat transfer oil system, as well as whether there are problems with the oil’s ability to retain moisture when heated. Generally, heat transfer oil can be used for one to two years without any problems.
The poster must be from a heat transfer oil manufacturer, or else they’re just trying to promote something. Personally, I think it’s more cost-effective to replace it every two to three years. The first is the production cycle, the second is the cost issue, and the third is the safety issue. After a while, it becomes uneconomical, as the heat transfer efficiency declines.
1) If it needs to be replaced every six months or a year, it indicates that the initial selection of this heat transfer oil was inappropriate； 2) Generally, when selecting a product for the first time, it is necessary to ensure that it can be used safely for at least 5 to 10 years or more ； In reality, there are ones that have been in use for 20 to 30 years without being replaced. 3) Whether the heat transfer oil should be scrapped and replaced is clearly specified in the new standard «Safety Technical Requirements for Organic Heat Transfer Media GB 24747—2009» – once certain parameters meet the specified standards, the oil must be discarded.
It’s so easy to do. It needs to be replaced every six months. We’ve been using it for several years; we check its viscosity every six months to see if it deviates significantly from the acceptable standards. If nothing is wrong, we can continue using it and just top up with new heat transfer oil regularly
It’s so expensive. We have been using our set of equipment for 10 years without changing the oil; during the expansion, about 40% more new oil was added. Another set was used for 6 years without being replaced once. The above two sets of equipment are currently operating normally; only small amounts of oil are added in case of leaks or during maintenance. Instead of looking for reasons related to oil, the poster should analyze from a technical and operational perspective what problems exist in their own setup.