2 replies to this topic

I am in the process of sizing relief devices (fire scenario) for heat transfer fluid lines. The device set points (100 and 150 psig) are pushing the fluid near the critical point. I suspect that the fluid will start to break down (and possibly form a solid) as it approaches the critical point (620F, 176 psia). There is no data or literature on the behavior of syltherm (dimethyl polysiloxane, MW=317) in this region near the critical point. Has anyone had any similar relief cases or experience with syltherm xlt at high temperatures (>550 F)?

Looking for some relief,
gamecock_engr

[pleckner]

I'm curious, what is the application?

One solution is to call your sales rep and have him/her get you the answer. If this isn't a unique application, Dow might have an answer for you. Also, approaching the critical point isn't the same as being at the critical point. You may not have a real issue afterall. In addition, why such high set pressures (this goes back to my asking about your application)?

[Art Montemayor]

Game:

If you are that concerned, all you have to do is go to:

http://www.dow.com/h...yl800/index.htm

and also call the listed (800) number given by Dow. Dow should have not trouble giving you all the thermophysical data that they have on their compound. Additionally, I'm sure that they've tested it to extreme applications in order to ensure that their product is not hazardous nor does it create a danger for others.

Phil is completely correct in his judgment. You may just not have a complete understanding of the product's limitations vis-a-vis your application. Dow has been in the Heat Transfer Fluids market since I can remember. I don't think they would tolerate a fluid that they couldn't control or dominate.