Hello,
I am working on a project where I have Condy/Water/Gas being sent to 3-phase separator.
The Gas can be ignored here as it isn't presenting problems.
Condy was initially being sent to separator tanks but In order to meet D60 venting requirements it is now being sent to a sales line with water from the boot. (I will attach a photo of system for reference.)
IT has been confirmed the pipeline can handle the mixture of the water/condy so long as they are both metered prior to reinjection to pipeline.
Client is adamant on using a plunger pump that currently exists on site to save costs and as such we require a booster pump to provide NPSHr to the plunger pump.
When I did some preliminary hydraulic calcs, i noticed from line losses alone that the pump NPSHa is ~2.7 ft with no safety margin. The water has sufficient static head, however the condy does not and there are meters, CV's and a basket strainer which will all eat away at the required NPSHa. The senior process engineer has agreed we will have cavitation.
Is it possible to control the downstream plunger pump from the separator's level transmitter, and install a interface level gauge?
There is not much that can be done and client does not want to spend more money on a vertical submersible pump.
Hands tied, ideas low.
Any help is appreciated.