API vs CPI: Key Differences in Oil/Water Separation

[Perau]

it's to my understanding that API n CPI uses the same theory to remove oil from water.
but what are the key differences that makes CPI much more expensive or that make API cheaper?

 

[stewartcs]

it's to my understanding that API n CPI uses the same theory to remove oil from water.
but what are the key differences that makes CPI much more expensive or that make API cheaper?

I'm not really familiar with a CPI style separator, but I imagine that if they are more expensive it would have something to do with the material used.

API separators are pretty simple and normally just use nozzels and baffles (and take advantage of gravity) to separate the fluid.

CS