TOPIC 8: Vents and Venting System Flashcards
Portion of the drainage pipe installation intended to
maintain a balanced atmospheric pressure inside the
system
VENTILATION
pipe or opening used for ensuring the
circulation of air in a plumbing system and for relieving the
negative pressure exerted on trap seals
Vent Pipe
- the ‘backbone’ of the entire sanitary
system - Connected to the Main Soil & Waste
Stack - The portion where waste does not
travel through
Main Soil & Waste Vent
- Continues to the roof; the portion
penetrating the roof is called the
Vent Stack Through Roof (VSTR)
- the principal artery of the venting
system to which vent branches are
connected. - serves as support to the Main Soil &
Waste Vent - a.k.a. ‘Collecting Vent Line’
Main Vent
a pipe installed to vent a fixture trap, that connects with the vent system above the fixture served or terminates in the open air.
Individual Vent or Back Vent
an arrangement of venting so
installed that one vent pipe
serve two (2) traps.
Unit, Common, or Dual Vent
a vertical vent line that provides
additional circulation of air between
the drainage and vent systems or to
act as an auxiliary vent on a specially
designed system such as a
“yoke vent” connection between the
soil and vent stacks.
Relief Vent
a pipe connecting upward from a soil
or waste stack below the floor and
below horizontal connection to an
adjacent vent stack at a point above
the floor and higher than the highest
spill level of fixtures for preventing
pressure changes in the stacks.
Yoke or By-pass Vent
- a group vent pipe which starts in front of the extreme (highest) fixture connection on a horizontal branch and connects to the vent stack.
- a.k.a. ‘Loop Vent’
- Serves a battery of fixtures
Circuit Vent
- a vertical vent connection on a
horizontal soil or waste pipe
branch at a point downstream
of the last fixture connection
and turning to a horizontal line
above the highest overflow
level of the highest fixture
connected there - Used in spaces without partitions
Looped Vent
that portion of a vent pipe through which wastewater also
flows through.
Wet Vent
a pipe or shaft to convey foul air
from a plumbing fixture or a room
to the outer air.
Local Vent
a vent that does not carry liquid or
water-borne wastes.
Dry Vent
the extension of a soil or waste stack
above the highest horizontal drain
connected to the stack.
Stack Vent
the vertical vent pipe installed
primarily for providing circulation of
air to and from any part of the soil, waste of the drainage system.
Vent Stack
The uppermost end above the roof has traditionally been referred to as
Vent Stack Through Roof (VSTR).
Vents Required: Each trap shall be protected against ___ and ____through venting.
siphonage and backpressure
Vents not Required: on a _____ which discharges through a horizontal indirect waste pipe into a secondary interceptor. The secondary interceptor shall be properly trapped and vented.
primary settling tank interceptor
Vents not Required: ____. Such sink shall
discharge by means of an approved indirect waste pipe into a floor sink or other approved type receptor.
Traps serving sinks in an island bar counter