BUILDING UTILITIES 1Module 2 Lecture 2Plumbing Vents
The plumbing vent system is part of the building plumbing drain system and serves three basic functions:1. Allow building drains to flow freely by allowing air into the drain system, avoiding the vacuum and slow drainage that would otherwise occur at fixtures.2. Allow sewer gases to be vented safely outdoors.oSewer gases may flow back into the building drain piping from a public sewer or private septic system, thus the plumbing vent system needs to carry these gases outside, usually above the building roof, where they are disposed-of safely and without leaving unpleasant, or possibly dangerous smells and gases inside the building.3. To keep the water from siphoning out of the traps.
Branch venta vent pipe extending horizontally that connects multiple vents together from a branch of the drainage system to a stack vent or vent stack.Fixture drainWet ventPortion of a vent pipe through which liquid waste flowIndividual ventServes as a continuation of the trap arm but can also be the vent that serves a bathroom group that is being wet-vented.Fixture branchP-trap
Vent stackthe main vent for a DWV system; receives other vents and terminates to open air through the roof or connects with the stack ventStack ventan extension of a soil or waste stack above the highest horizontal drain connected to the stack; the vent for the waste stack and begins where the WS ends.Circuit venta branch vent that serves a specific design known as battery venting (more than one fixture); it is installed before the last fixture extend up to open air or connects with the vent stack and not the stack vent.Loop ventsame as circuit vent, except that this design is on the highest branch interval; typically does not require a relief vent, and connects to the stack vent and not to the vent stackRelief venta vent that provides circulation of air between drainage and vent system; serves to relieve pressures of a specific area of a system.
Located above the highest horizontal drain connected to the stack; the vent for the soil or waste stack and begins where the soil or waste stack ends.
Important criteria to remember when sizing a conventional venting system composed of individual fixture vents, vent stacks, and stack vents.