Fyrquel Overtemperature

Dan. I would not expect any problems for that temperature and time of exposure. Checking with the fluid supplier (or outside lab) is always the right thing to do.

quote:

Originally posted by Dan Horn:
We operated our DEH control fluid temperature at about 170 degrees Fahrenheit for about three hours due to a loss of cooling water. We have a 1300 mw unit, with Fyrquel as the control fluid. Do you have any comments or experience with this? We sent a smaple to the Supresta lab and it indicated okay. Thanks!

While the fluid might test okay Supresta do not do some of the more useful tests like color. If the fluid was overheated just because the coolers were out of service or something else that caused bulk overheating, then it should be fine. If it was overheated because you ran both pumps for some time and the compensators were set wrong so that the excess fluid was discharging through a pressure relief valve back to the reservoir, then the compression of entrained air could burn the fluid. Depending n the cause you might ask them to start doing color. New fluid is less than 1 while normal fluid in service is a 2-3 on the ASTM Scale. While the scale is for mineral oil and phosphate esters do not go through a red phase, it is helpful. A 7-8 is not good but still workable depending on the system. Some NEIP and ABB systems tend to darken the fluid.

Thank You. The info was very helpful. It looks like we will be okay.

Dan, Ihave to agree with EHCGUY on this one. Running Fyrquel at elevated temps 1 time because of cooler not operating correctly should be fine. If it keeps happening we have seen other things happen a different story. I know of a company that asked why when our EHC system is operating at 230 degrees i have roblems with my oil (fyrquel)? First i would ask why is operating at that temp? They have no clue and they should find out why to correct. On a fluid stand point, Fyrquel as a lower viscosity index than the 2 other main EHC fluids. 1 is Quintolubric (polyoleaster) and Ecosafe EHC (PAG). These to fluids have a high vis index which makes them more stable at higher temps. Vis index is change in vis per change in temps. The higher the visosity index a fluid has means at higher temps it wont thin as much and will still have the body to lubricate. Also the lower he temps get it wont thicken as much. Hope this help just FYI