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[Rush]

We are currently evaluating a retrofit design for a Caisson Pump for an offshore platform.
The existing design allows produced fluids and water to be introduced into a caisson sump,(one end open to the sea...at a depth of approx 66ft.) which, by gravity separation allows the condensate to rise to the surface.
The pump then removes the condensate pad of fluid, via three 'hard pipes'

This design is being reviwed since
1.) the amount of condensate can vary, (and therefore the height of condensate can vary.)
2.) the height can vary due to the impact of waves andf sea currents.
3.) the potential for introducing seawater into the production system

Our initial approach is to suggest a Floating suction line, such that the float always remains on the surface. This ensures that there should be no effect on the pump suctiuon due to tidal or sea current considerations.

This suggestion in itself does not ensure that seawater is not introduced into the production systems and therefore a water-cut meter is suggested on the pump discharge. On detection of the change of fluid in the pump discharge from condensate to seawater, a signal will be sent to the pump to cut off.
(A small amount of seawater may be allowed.)


Does anyone have any ideas on this proposed design?
Any modifications suggested?