Pipeline Modeling / Flow Assurance

[ChEMatt]

When modeling pipelines, does one assume that your process simulator will provide an accurate (as accurate as your compositional input and operating parameters, of course) representation of gas breakout in the system, or does one use a rule-of-thumb or fudge factor to add vapor to determine the resulting hydraulics due to poor operation or unexpected flashing in the pipeline?

Thanks,

-m

 

[RVAmeche]

You should be able to provide a gut check of the results using Crane TP 410 or your reference of choice. This includes checking pressure/vapor pressure and making sure the fluid is in't unexpectedly flashing.

Note this is not a "one time and assume it's okay forever" situation; after every software update be sure to check your next model.

I've run into instances where a software patch inadvertently messed up the software's NSPH calculation and friction factors. They were fixed quickly but if you don't look you won't notice.

 

[LittleInch]

Many programs won't really work if you have two phase flow.

Depends on the sophistication of your program.

A pressure versus distance graph will show if you're getting too close to the vapour pressure.

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