Plumbing Dictionary


Plumbing termonalogy.

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I

IGNITION PILOT

A pilot that operates during the lighting cycle and discontinues during main burner operation.

INCINERATOR, DOMESTIC GAS-FIRED

A domestic appliance used to reduce combustible refuse material to ashes and which is manufactured, sold and installed as a complete unit.

INDIRECT WASTE PIPE

A waste pipe that does not connect directly with the drainage system, but that discharges into the drainage system through an air break or air gap into a trap, fixture, receptor or interceptor.

INDIVIDUAL SEWAGE DISPOSAL SYSTEM

A system for disposal of domestic sewage by means of a septic tank, cesspool or mechanical treatment, designed for utilization apart from a public sewer to serve a single establishment or building.

INDIVIDUAL VENT

A pipe installed to vent a fixture trap and connects with the vent system above the fixture served or terminates in the open air.

INDIVIDUAL WATER SUPPLY

A water supply, except an approved public water supply, that serves one or more families.

INFRARED RADIANT HEATER

A heater which directs a substantial amount of its energy output in the form of infrared radiant energy into the area to be heated. Such heaters may be of either the vented or unvented type.

INTERCEPTOR

A device designed and installed to separate and retain for removal, by automatic or manual means, deleterious, hazardous or undesirable matter from normal wastes, while permitting normal sewage or wastes to discharge into the drainage system by gravity.

INTERMITTENT PILOT

A pilot that operates during the ignition cycle and continues during main burner operation, but is shut off at other times.

IRON PIPE SIZE

Now refered to as NPT in most applications. IPS stand for Iron Pipe Size, although most pipe is no longer iron. Both NPT and IPS refer to a the typical standard measure for threaded pipe with a tapered thread.