2 replies to this topic

[twell]

I am simulating a natural gas pipeline with the method Pipe in Prode Properties from Microsoft Excel, I model the pipeline as a series of about 10 segments (different elevations), I have mainly vapor + some condensate, method Pipe does include also Beggs and Brill model, should I specify Beggs and Brill or leave the default option for vapor flow ?

[ankur2061]

twell,

The smallest amount of condensate in the gas classifies it as 2-phase flow and it should be modeled as such. If you want to model it as single-phase gas then you can utilize the AGA, Weymouth, Panhandle A or Panhandle B equations for flow / pressure drop. Personally, I would not recommend using single-phase gas correlations if I know that condensate is present in the gas.

For 2-phase flow, Beggs & Brill overpredicts the pressure drop (higher pressure drops calculated) for condensate pipelines with high gas-to-condensate ratio or in other words high gas-to-liquid ratios. If you have the option of using "Aziz & Govier" correlation use it, since it gives more accurate pressure drop values. If not, Beggs and Brill should do.

Hope this helps.

Regards,
Ankur.

[PaoloPemi]

I agree with Ankur that selection should depend from amount of condensate,
note that when there is no condensate Prode Properties automatically selects a suitable model for gas phase in substitution of Beggs and Brill.