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Questions and Answers
What is the term for the principal artery of the venting system?
Main Vent
What is the purpose of a vent pipe in a plumbing system?
The portion penetrating the roof of the venting system is called the ______.
Vent Stack Through Roof (VSTR)
A circuit vent connects to the highest fixture in a plumbing system.
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What is a Loop Vent used for?
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Which type of venting allows wastewater to flow through it?
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VSTR shall terminate vertically not less than ______ above the roof.
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What is a Dry Vent?
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Study Notes
Ventilation Systems
- Vent pipe - provides air circulation in plumbing systems to relieve negative pressure on trap seals.
- Yoke Vent (By-pass Vent): connects upward from a soil or waste stack below the floor and connects to an adjacent vent stack at a point above the floor and higher than the highest spill level - helps prevent pressure changes in the stacks.
- Main Vent (Collecting Vent Line): the principle artery of the venting system; connects to all vent branches; acts as a support for Main Soil & Waste Vent
- Circuit Vent (Loop Vent): starts in front of the highest fixture connection on a horizontal branch and connects to the vent stack; serves a battery of fixtures.
- Individual Vent/Back Vent: vents a fixture trap and connects with the vent system above the fixture served or terminates in the open air.
- Looped Vent: vertical vent connection on a horizontal soil or waste pipe branch at a point downstream of the last fixture connection; turns horizontal above the highest overflow level of the highest fixture.
- Unit, Common, or Dual Vent: uses a vent pipe to serve two traps.
- Wet Vent: a vent pipe where wastewater flows through.
- Relief Vent: vertical vent line that provides additional air circulation between the drainage and vent systems or acts as an auxiliary vent on a specially designed system.
- Local Vent: conveys foul air from plumbing fixture to outer air.
- Dry Vent: vent that does not carry liquid or water-borne wastes.
Vent Termination
- VSTR (Vent Stack Through Roof) shall be vertically terminated at least 150mm above the roof and 300mm from any vertical surface nearby.
- Each vent opening shall terminate at least 3m from any openable window.
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Description
Test your knowledge of ventilation systems used in plumbing, including various types of vents like vent pipes, yoke vents, and circuit vents. Understand their functions and connections to ensure proper air circulation and pressure management in plumbing systems.
