1 reply to this topic

[processengbd]

I recently came across the following discussion. Where it has been mentioned that

 

"Also, one more thing worth to mention: hydrate formation studies should not be performed using Hysys. It is better to use OLGA, if available. 

Hysys does not give consistent results, and hydrate forming regions are (sometimes) contradictory within the same flowsheet."

 

http://www.cheresour...of-natural-gas/

 

 

I usually do multiphase flow simulation in HYSYS pipe sizing utility. As it has Beggs and Bril correlations for multiphase calculation. Even though OLGA performs a better job I suspect it will not justifiable to buy OLGA licence for this purpose. Please share your views.

 

I also use hydrate formation utility to predict the hydrate formation temperature. We usually also check with GPSA curve. I have heard that in sour gas condition HYSYS hydrate formation utility produce less desired results. I have also heard that PROMAX does a better job in this case.

 

Regards

Edited by processengbd, 09 May 2014 - 05:36 AM.

[PaoloPemi]

that was a 2007 thread and models have been improved in the meantime,

if you work on a little company (as I do) without too much resources available, a possible way is to estimate the errors from your models and apply  safety factors,

for example, hydrates require specific models, the Center for Hydrate Research has developed several accurate models, years ago I purchased the book by Sloan which includes CSMGem application,

I have compared results with my software (Prode Properties) and found a good agreement on published data,

in other tests I have found that CSMGem predicts ice formation at somewhat unrealistic conditions,

some unrealistic values also from Prode with inibitors (compared with published data),

not very large errors so you can correct.

I presume you can find a similar behaviour for two phase flow model,

Beggs & Brill has been reported as accurate on a certain number of cases, it is not good for ALL conditions,

again with Prode  (and Hysys, Promax etc.) you may find those cases where Beggs&Brilll is not accurate at all.

Edited by PaoloPemi, 09 May 2014 - 09:13 AM.