Lubricant Latent Heat 1

[Guilherme_Azambuja]

Hi,

my client is replacing a compressors oil cooler, for a bigger one.
During HAZOP analisys was defined to design a fire case PSV for oil side...

In my point of view, i should consider the heat imput as a fire case, but calculate capacity as a thermal relief, but, actually, its not the client's ideia!

Does any one has any data on Lubricants? Mainly latent heat?
The oil is a normal ISO VG 46. Its being very difficult to find information, even contacting suppliers...

Thanks

 

[The Obturator]

Interesting question.

Here is something similar that may lead you to the answer you're looking for

https://www.cheresources.com/invision/topic/7689-latent-heat-of-vaporisation-for-lubricating-oils/

Per ISO-4126, only the term Safety Valve is used regardless of application or design.

 

[Guilherme_Azambuja]

Thanks Obturator.
I took a look in cheresources, but the thread is not finished... But... i'm trying to find an S.G. vs Latent heat in some bibliography. I guess i need som old books...

 

[The Obturator]

I was hoping that the suggestion on the chersources would help. Maybe your answer is in this old publication file:///C:/Users/mazbo/Desktop/GOVPUB-C13-da7a968e895631e1fad8cf9c2aef73e1.pdf

Per ISO-4126, only the term Safety Valve is used regardless of application or design.

 

[georgeverghese]

Vaguely recall the API 520 recommendation to use 40Btu/lb as latent heat of vaporisation when it is not known.

 

[Guilherme_Azambuja]

great!
50, actually! Thanks for the tip!

 

[pierreick]

Hi,
Attached an estimate for hydrocarbon based on Temp and SG :

http://www.gulleyassociates.com/newtips.htm#Feb09

hope this is helping you.
Pierre