Plumbing Dictionary


Plumbing termonalogy.

Browse the glossary using this index

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H

HANGERS

See "Supports."

HEATING VALUE, TOTAL

The number of BTU's produced by the combustion, at constant pressure, of 1 cu ft (0.0283 m3) of gas when the products of combustion are cooled to the initial temperature of the gas and air, when the water vapor formed during combustion is condensed, and when all necessary corrections have been applied.

HELPER

1. aid, assistance; also a source of aid 

2: remedy, relief

3: one who assists another 

4: the services of a paid worker

HORIZONTAL BRANCH DRAIN

A drainage branch pipe extending laterally from a soil or waste stack or building drain, with or without vertical sections or branches, that receives the discharge from two or more fixture drains or branches and conducts the discharge to the soil or waste stack or to the building drain.

HORIZONTAL PIPE

Any pipe or fitting that makes an angle of less than 45 degrees (0.79 rad) with the horizontal.

HOT WATER

Water at a temperature greater than or equal to 120 F (49 C)

HOTEL AND RESTAURANT RANGE

A gas appliance of the floor type providing for top cooking, roasting, baking or broiling, or any combination of top cooking with any of these other functions and not designed specifically for domestic use.

HOUSE PIPING

See BUILDING PIPING

HOUSE TRAP

See "Building trap."