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Start-up (clean) pressure-drop
When a new filter element is installed, the element is clean and dry, the filter media pores are not blocked with particles or liquid droplets, and gas flows freely; most of the pressure-drop is caused by the filter system.
The start-up pressure-drop (clean and dry filter element) of the total system is described in the API 692 as filter sizing parameter.
2.
Operational *(saturated) pressure-drop*
The filter element is capturing/coalescing and draining liquids from the gas flow.
The filter element pores are partially blocked with captured droplets (saturated) and the gas has more restrictions when passing through.
The operational pressure-drop when fully saturated can be 4 times higher than start-up.