The drain-waste vent is attached at the building drain system's highest point, and rises (usually inside a wall) to and out of the roof. Through traps, all fixtures are connected to waste lines, which in turn take the waste to a "soil stack", also known as "soil stack pipe", "soil vent pipe" or "main". Īll plumbing waste fixtures use traps to prevent sewer gases from leaking into the house. The top of stacks must be vented too, via a stack vent, which is sometimes called a stink pipe. Without a vent, negative pressure from water leaving the system can cause a siphon which empties the trap. Every plumbing fixture must also have an attached vent. By contrast, potable water supply systems operate under pressure to distribute water up through buildings, and do not require a continuous downward slope in their piping.Įvery fixture is required to have an internal or external trap double trapping is prohibited by plumbing codes due to its susceptibility to clogging. In some situations, a downward slope out of a building to the sewer cannot be created, and a special collection pit and grinding lift "sewage ejector" pump are needed. It is critical that a sufficient downward slope be maintained throughout the drain pipes, to keep liquids and entrained solids flowing freely towards the main drain from the building. As the water runs down air must be allowed into the waste pipe either through a roof vent (external), or an internal vent.ĭWV systems maintain neutral air pressure in the drains, allowing free flow of water and sewage down drains and through waste pipes by gravity. As the water runs down, proper venting is required to allow water to flow freely, and avoid a vacuum from being created. Drain refers to water produced at fixtures such as sinks, and showers waste refers to water from toilets. In modern plumbing, a drain-waste-vent (or DWV) is a system that allows air to enter the plumbing system to maintain proper air pressure to enable the removal of sewage and greywater from a dwelling. Soil stack is connected to the sewer at the bottom and vented at the top, while each plumbing fixture has its own trap. ( Learn how and when to remove this template message) ( July 2015) ( Learn how and when to remove this template message) You may improve this article, discuss the issue on the talk page, or create a new article, as appropriate. So do I use 160 DFU to also figure the ejector vent size in table 7.5? That would put it at a 4” vent but everything I’ve seen shows a 2” vent for an ejector basin.The examples and perspective in this article may not represent a worldwide view of the subject. So that would be about 160 dfu.īecause of that I'm planning on running the discharge line all the way over to my 4" main drain line rather than a closer 3" drain line. At my head pressure (10 ft) it looks like most small pumps are closer to 80 gpm. I've looked around and haven't found an ejector pump that small though. So the ejector pump would be minimum of 40 DFU if it was at the minimum of 20 gpm. Such as from a pump, sump ejector, air conditioning equipment, or similar device, two (2) fixture units shall be allowed for each gal1on per minute (3.78 Less than 20 ga11ons per minute (75.7 Lim).ħ02.3 For a continuous flow into a drainage system, The discharge of water closets or urinals:ħ10.3.1 Shall A sewage ejector or sewage pump receiving.But for the ejector basin vent it looks like these sections apply: For just the lav wet vent a 2" vent is plenty (lav (1) and WC(3) totals just 4 DFU). Thanks Eplummer, I'm glad you brought up vent sizing because I hadn't thought about the impact of the pump on that. Vent from an air-operating sewage ejector shall combine Total number of fixtures discharging into the sump. The vent, after leaving the sump, is combined with ventsįrom fixtures discharging into the sump, the size of theĬombined vent need not exceed that required for the When the foregoing requirements are met and Nor less than one and one-half (1-1/2) inches (40 mm) inĭiameter. Number and type of fixtures discharging into the sump, Less in size than that required by Table 7-5 for the Normal operating conditions and, in no case, shall be Maintain atmospheric pressure within the sump under all Through the roof or, when permitted, may be combined Provided with a vent pipe that shall extend separately Manhole or equivalent opening to permit access for With substantial covers having a bolt-and-gasket type UPC 710.10 Sumps and receiving tanks shall be provided But your area may want the separate vent.Ĭheck out the bold print in the code reference below:īTW- per table 7-5 you will need a 2" vent because of your toilet. It would be best for you to call your inspector.
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