Method of expressing a filter's ability to trap and retain contaminants of a given size.


Related Terms

GROIN

A structure (usually one of a group) extending approximately perpendicular from a shore to protect the shore from erosion by tides currents, or waves or to trap sand for making a beach.

TRAP

A receptacle for the collection of undesirable material.

FISH TRAP AREAS

Areas established by the Corps of Engineers in which traps may be built and maintained according to established regulations. The fish stakes which may exist in these areas are obstructions to navigation and may be dangerous. The limits of fish trap areas and a cautionary note are usually charted.

RETURN TRAP

A trap designed to discharge its condensate against boiler pressure and feed to the boiler without additional mechanical equipment.

SIPHON

A pigtail-shaped pipe or a drop leg in the pipe leading to a steam pressure gauge, serving to trap water in the gauge and prevent overheating from direct contact with steam.

BACK VENT

An individual vent for a plumbing fixture located on the downstream (sewer) side of a trap to protect the trap against siphonage.

BAG TRAP

An S-shaped trap in which the vertical inlet and outlet pipes are in alignment.

DIFFERENTIAL LEAK DETECTOR

A leak detector consisting of two tubes and a trap which directs the tracer gas from the system into the desired tube.

DRUM TRAP

In plumbing, a trap in the form of a cylinder with a vertical axis that is fitted with a removable cover plate.

FLAP TRAP

In plumbing, a trap fitted with a hinged flap that permits flow in one direction only, thus preventing backflow.

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