Plumbing Dictionary


Plumbing termonalogy.

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O

OCCUPANCY

The purpose for which a building or portion thereof is utilized or occupied.

OFFSET

A combination of approved bends that makes two changes in direction bringing one section of the pipe out of line but into a line parallel with the other section.

OPEN AIR

Outside the structure.

ORIFICE

The opening in a cap, spud or other device whereby the flow of gas is limited and through which the gas is discharged to the burner.

ORIFICE CAP (HOOD)

A movable fitting having an orifice which permits adjustment of the flow of gas by the changing of its position with respect to a fixed needle or other device.

ORIFICE SPUD

A removable plug or cap containing an orifice and which permits adjustment of the flow of gas either by substitution of a spud with a different sized orifice or by the motion of a needle with respect to it.

OUTLET

A threaded connection or bolted flange in a pipe system to which a gas burning appliance is or may be attached. Outlets must be located in the room or space where the appliance is or may be installed.

OXYGEN DEPLETION SAFETY SHUT -OFF

A system designed to act to shut off the gas supply to the main and pilot burners if the oxygen in the surrounding atmosphere is reduced below a predetermined level.