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Please, I need insight on how to achieve a low pressure at a pipeline tie-in point. The case at hand is stated below:
A crude oil pipeline pump is to transport a 70000 bopd from an offshore storage facility through a departing pipeline and tie-in to another pipeline which has been derated to 285 psig. Based on the pump performance curve, the discharge pressure from the oil pipeline pump is 526 psig which is greater than the MAWP of the tie-in pipeline.
The oil flow rate is to be maintained while the delivery pressure at the tie-point should not exceed the MAWP of the pipeline which is 285 psig. Is it possible to maintain the flow rate at low pressure at the tie-point?
I developed a 2 case models using PIPEPHASE software. The cases are to see the effect of installing a PCV to regulate the downstream pressure and without a PCV.
Case 1: Regulating the downstream P by setting the PCV @200 psig gives a delivery pressure of 173.6 at the tie-point. Discharge pressure from the pump is 553.2 psig with pump power of 787.6 psig and 0.85 efficiency.
Case 2: The delivery pressure at the tie-in point is 526.3 psig without any PCV installed downstream on the oil pipeline pump discharge line.
Please, I need your comments on the two results I provided.
Also, a colleague suggested that we should install a PSV on the departing pipeline to provide pressure relief should the pressure goes above the required downstream tie-in pressure. The departing pipeline MAWP can withstand any excess pressure that could be generated from the pump. Is it logical to install a PCV on the line with the aim to control the tie-in pont pressure which is some kilometers away?
Thanks for your anticipated comments.
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