2 replies to this topic

[prasad54]

Hello Everyone,

First of all I would like to thank the all the members of the forums for posting and sharing such gr8 information.


I am presently sizing a PSV for a fire case for a lubricating oils.........

Since the MSDS of this Lubricating oil has no information of the Latent heat of vaporisation, I would like to know, how shall I proceed.

Is there a API norm or guideline for estimating a general value of the Latent heat of vaporisation if the data is not avalibale.

Thanks in advance

[ankur2061]

Prasad,

If your lubricating oil is not a wide-boiling range oil with low to high boiling components then just flash the oil using a simulator, like HYSYS, at your relieving temperature and read the enthalpy of the flashed stream. This would correspond to your latent heat of vaporization of the lubrication oil.

There may be some other method which other learned members may be able to point out. Hopefully, others will also be able to contribute.

Regards,
Ankur.

Regards,
Ankur.

[smalawi]

Hi,

it depends on how accurate your figure has to be,

I think the API databook as a figure for s.g. vs heat of vap; not too sure, but worth checking

If it has to be very accurate, then you need a Simdis (D2887 distillation or equivalent) and the s.g. - and follow Ankur advice,

cheers,

sm