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P

Pressure differential

difference between make pressure and break pressure.

Pressure exchanger

device which transfers hydraulic energy from a high-pressure fluid flow to a low-pressure fluid flow.

Pressure range setting

pressure range within which the unit will give a signal (contact changeover).

Pressure switch

device that operates an electrical contact when a pre-set fluid pressure has been reached on its input.

PS

port side

PW

potable water

R

Re-hardening filter

device which uses on board ships to remove solid particles and contaminants and to adjust suitable PH value of desalinated water.

Reverse osmosis

water purification process commonly used in freshwater generation or boiler feed-water desalination and relies on the principle that when solutions of differing concentrations are separated by a semi-permeable membrane.

RO


S

Salinity

amount of dissolved salts that are present in water.


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