Page 27 - 2018_IPC

DEFINITIONS

in the water supply mains causes a potential backflow condi- Storm. A building drain that conveys storm water or other
tion. drainage, but not sewage.
Backpressure, low head. A pressure less than or equal to BUILDING SEWER. That part of the drainage system that
4.33 psi (29.88 kPa) or the pressure exerted by a 10-foot extends from the end of the building drain and conveys the
(3048 mm) column of water. discharge to a public sewer, private sewer, individual sewage
disposal system or other point of disposal.
Backsiphonage. The backflow of potentially contami-
nated water into the potable water system as a result of the Combined. A building sewer that conveys both sewage
pressure in the potable water system falling below atmo- and storm water or other drainage.
spheric pressure of the plumbing fixtures, pools, tanks or Sanitary. A building sewer that conveys sewage only.
vats connected to the potable water distribution piping.
* Water supply system. The flow of water or other liquids, Storm. A building sewer that conveys storm water or
other drainage, but not sewage.
mixtures or substances into the distribution pipes of a
potable water supply from any source except the intended BUILDING SUBDRAIN. That portion of a drainage system
source. that does not drain by gravity into the building sewer.
BUILDING TRAP. A device, fitting or assembly of fittings
BACKFLOW CONNECTION. Any arrangement whereby
backflow is possible. installed in the building drain to prevent circulation of air
between the drainage system of the building and the building
** BACKFLOW, DRAINAGE. A reversal of flow in the sewer.
drainage system.
CIRCUIT VENT. A vent that connects to a horizontal drain-
BACKFLOW PREVENTER. A backflow prevention age branch and vents two traps to not more than eight traps or
assembly, a backflow prevention device or other means or trapped fixtures connected into a battery.
method to prevent backflow into the potable water supply.
CIRCULATING HOT WATER SYSTEM. A specifically
BACKWATER VALVE. A device or valve installed in the designed water distribution system where one or more pumps
building drain or sewer pipe where a sewer is subject to back- are operated in the service hot water piping to circulate
flow, and that prevents drainage or waste from backing up heated water from the water-heating equipment to fixture
into a lower level or fixtures and causing a flooding condi- supply and back to the water-heating equipment.
tion.
CISTERN. A small covered tank for storing water for a
[BS] BASE FLOOD ELEVATION. A reference point, home or farm. Generally, this tank stores rainwater to be uti-
determined in accordance with the building code, based on lized for purposes other than in the potable water supply, and
the depth or peak elevation of flooding, including wave such tank is placed underground in most cases.
height, which has a 1 percent (100-year flood) or greater CLEANOUT. An access opening in the drainage system uti-
chance of occurring in any given year.
lized for the removal of obstructions. Types of cleanouts
BATHROOM GROUP. A group of fixtures consisting of a include a removable plug or cap, and a removable fixture or
water closet, lavatory, bathtub or shower, including or fixture trap.
excluding a bidet, an emergency floor drain or both. Such fix- [A] CODE. These regulations, subsequent amendments
tures are located together on the same floor level.
thereto or any emergency rule or regulation that the adminis-
BRANCH. Any part of the piping system except a riser, main trative authority having jurisdiction has lawfully adopted.
or stack.
[A] CODE OFFICIAL. The officer or other designated
BRANCH INTERVAL. A vertical measurement of dis- authority charged with the administration and enforcement of
tance, 8 feet (2438 mm) or more in developed length, this code, or a duly authorized representative.
between the connections of horizontal branches to a drainage COLLECTION PIPE. Unpressurized pipe used within the
stack. Measurements are taken down the stack from the high- collection system that drains on-site nonpotable water or rain-
est horizontal branch connection.
water to a storage tank by gravity.
BRANCH VENT. A vent connecting one or more individual COMBINATION FIXTURE. A fixture combining one sink
vents with a vent stack or stack vent.
and laundry tray or a two- or three-compartment sink or laun-
[A] BUILDING. Any structure utilized or intended for sup- dry tray in one unit.
porting or sheltering any occupancy.
COMBINATION WASTE AND VENT SYSTEM. A spe-
BUILDING DRAIN. That part of the lowest piping of a cially designed system of waste piping embodying the hori-
drainage system that receives the discharge from soil, waste zontal wet venting of one or more sinks, lavatories, drinking
and other drainage pipes inside and that extends 30 inches fountains or floor drains by means of a common waste and
(762 mm) in developed length of pipe beyond the exterior vent pipe adequately sized to provide free movement of air
walls of the building and conveys the drainage to the building above the flow line of the drain.
sewer.
COMBINED BUILDING DRAIN. See “Building drain,
Combined. A building drain that conveys both sewage combined.”
and storm water or other drainage.
COMBINED BUILDING SEWER. See “Building sewer,
Sanitary. A building drain that conveys sewage only. combined.”

10 2018 INTERNATIONAL PLUMBING CODE ®
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