No replies to this topic

[ryn376]

We are working on a relief device project that has "Multitherm PG-1" heat transfer fluid in the half-pipe jackets of vessel (half-pipe jackets usually necessitating two-phase flow calcs). I think the best option to prevent overpressure at this point is to use fusible plugs since I obtained their extended dataset of properties, but they do not have any properties for the gas phase according to the vendor. Additionally, properties are not available in Aspen/HYSYS so I do not think I can carry out the required direct integration calcs. Note that based on a regression of the vapor pressure data, the fluid would be close to or above the critical point (so there are of course no two phase flow calcs). Multitherm gave me the following intrinsic properties: critical temperature/pressure/volume and MW. Additionally, in the temperature range of -22 F to 608 F they gave density, viscosity, specific heat, thermal conductivity, vapor pressure, and (at 600 F) heat of vaporization. 

 

I have never installed a fusible plug and do not know what equations to use; what would you recommend for fusible plug sizing equations? I would assume I should size it as an orifice at fusible plug melting temperature (500 F) and operating pressure (50 psig) not the MAWP (150 psig) plus 21% and plug melting temp?

 

Additionally, I am having a hard time finding manufacturers of fusible plugs for liquids, does anybody have recommendations? I have tried Sinomas (do not sell individual devices according to a rep), Precision Aero (requires us to provide engineering drawings), Stellar Industrial, and Globe, but have not had any luck.

Edited by ryn376, 23 May 2018 - 02:51 PM.