Multi-phase pipelines and pumps

[confidential]

Dear friend

I want to ask qusations about Multi-phase

i developed a computer programm to simulate a multi-phase
flow in inclined piplines

I used beggs and brill method for predicting
pressure loss and hold-up ?but is this method valid
for large diameters pipeline (20-40 inch)(trunk lines).

I suppose that the two phase pipeline system,is along distance large diameter pipeline this line transports the oil and gas mixture (coming from a gathering sytem which
transports the fluid of many wells).At the head of this line thers is a pumping station,in this station the
mixture is pumped into the trunkline and transported to processing facilities.?
does such a scheme exist in the fields?and if not how should i consider the scheme?

I want to ask about multi-phase pump, that will be used in
pumping station?is there any book or paper which deal with this issue(like horse power calculation ...etc).

if any one can provide me with a good explanation for these issues ,and a web sits that offers a free material
regarding these issues.

Your opinions would be very appreciated

Thanks