Reasons for coking and countermeasures when using 15# industrial white oil in the sealing of high-temperature pumps
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Dear experts, for high-temperature pumps, especially those operating at temperatures above 300 degrees, the seal flushing system 53B uses 15# industrial white oil. After operation for a short period of time, it was found that the bellows of the seal had severe coking. Is it possible to use another type of oil as a substitute?
The cause of coking may be the poor thermal stability of 15# industrial white oil at high temperatures, which makes it prone to oxidation and decomposition to form coke. Consider using other oils with better thermal stability, such as synthetic oils or specialty oils, which can withstand high temperatures and are less prone to coking. At the same time, check whether the cooling system is functioning properly to ensure adequate cooling and thus reduce the thermal decomposition of the oil at high temperatures. .
What are the other irrigation protocols used in combination with 63B? The 32 and 62 flushing protocols can be added; using them together yields good results
I’m stopping by to learn a bit, thanks
Coking is actually related to high temperatures, as well as whether the fluid remains stable in such high-temperature conditions. If it is not stable, chemical decomposition or oxidation reactions may occur, leading to coking. Of course, the fluids here include the pumped fluid as well as the sealing fluid that isolates the pumped fluid from the atmosphere. For pumped fluids, a cooling flushing approach is primarily used, such as plan21 23 32, with the main goal of reducing the temperature of the sealing chamber ； As for the sealing on the side of the isolation fluid, the choice of isolation fluid is indeed very important. Abroad, there are specialized synthetic oils produced specifically for use as buffers and isolation fluids in mechanical seals, which can be used as a reference ； Additionally, if the space available for the pump is sufficient, a PLAN62 can be added to blow away oxygen with nitrogen, thereby preventing oxidation issues.
1. The isolation fluid, such as heat transfer oil, can be re-evaluated. 2. First of all, the poster did not specify whether it is the main sealing bellows or the second set of sealing bellows. If it is a primary seal, then it is necessary to consider what the accompanying flushing scheme is. For such high-temperature hot oil pumps, Plan 32 is generally used; it is applied at the front end of the primary seal, which is the area referred to by the original poster. If it is the second set, PLAN61/62 can be considered; they can be connected to the back side of the second set of sealed static rings, thereby solving the problem of coking in the static rings on the atmospheric side.