Tightlining around a tank

[JohnRAA]

As part of our gathering system we have centrifugal pumps that feed oil down a 4 mile line to a storage Tank. From the tank we have a PD pumps that move the oil farther down the system.

Due to the high cost of tank maintenance/inspection we are discussing tightlining around the tank.

I am unsure whether we can accomplish this with the existing PD pumps. I don't see how we can feed the PD pumps with the centrifugals and get it to work correctly.
The PD pumps are not on VFD.

Can someone help me out

Thanks

 

[whammett]

At what rate are the pumps running, and what is their range? (GPM)

"I came, I saw, I made it better."
-Ode to Industrial Engineers
Will ChevronTexaco Corp.

 

[BigInch]

If the PD at constant speed is in a good range of operation for the centrifugals and discharge pressure is within maximum centrifugal suction pressure, why not?

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"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

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