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  • Repeat After Me: Drain, Waste, Vent

Repeat After Me: Drain, Waste, Vent

Category: Sewer & Drain

Drainage Systems

Whether your Dallas home is on a sewer or septic system, the systems within your home are essentially the same. Drainage systems do not depend on pressure, as supply systems do. Instead, waste matter leaves your house because the drainage pipes all pitch, or angle, downward. Gravity pulls the waste along. The sewer line continues this downward flow to a sewage treatment facility or a septic tank.

While the system sounds simple, there’s more to it, including vents, traps, and clean outs. The vents sticking up from the roof of your Dallas home allow air to enter the drainpipes. If there were no air supply coming from the vents, wastewater would not flow out properly and the water in the traps would need to be siphoned away.

Traps are vital components of the drainage system. You can see a trap under every sink. It is the curved or S-shape section of pipe under a drain. Water flows from the basin with enough force to go through the trap and out through the drainpipe, but enough water stays in the trap afterward to form a seal that prevents sewer gas from backing up into your Dallas home. Every fixture must have a trap. Toilets are self-trapped and don’t require an additional trap at the drain. Bathtubs frequently have drum traps, not only to form a seal against sewer gas but also to collect hair and dirt in order to prevent clogged drains. Some kitchen sinks have grease traps to collect grease that might otherwise cause clogging. Because grease and hair are generally the causes of drain clogs, traps often have clean-out plugs that give you easier access to remove or break up any blockage.

Since a drainage system involves all of these components, it is usually referred to as the DWV: the drain-waste-vent system. If water is to flow out freely and waste is to exit properly, all components of the DWV must be present and in good working order. Examine the pipes in the basement or crawl space under your Dallas home to help you understand the system better.

Supply and Drainage Subsystems

The supply and drainage subsystems are two distinct operations, with no overlapping between them. There are bridges between the two, however, and the bridges are what make the plumbing system worth having. In plumbing jargon, any bridge between the supply and drainage systems is a fixture.

Toilets, sinks, and tubs are fixtures. In addition, an outside faucet is a fixture and so is a washing machine. All devices that draw freshwater and discharge wastewater are fixtures, and all are designed to keep the supply and drainage systems strictly segregated.

Some fixtures have individual supply shutoff valves so you don’t need to close the main shutoff to repair them. It’s a good idea to make sure everyone in the family knows the location of the main shutoff valve in your house as well as how to use it. You may want to tag the main shutoff valve so anyone can easily find it.

Before you embark on any plumbing repairs, always turn off the water supply to the fixture or the main shutoff. In addition, check with your Dallas plumbing code official before you add or change any pipe in your house. You will learn what is allowed and what is prohibited and whether or not a homeowner is allowed to do his or her own work.  Call on your Dallas plumber for any repairs that your plumbing code official does not green light.

Article Source: http://home.howstuffworks.com/home-improvement/plumbing/plumbing-basics-ga2.htm


If you're looking for information about Repeat After Me: Drain, Waste, Vent then please call Harvey West Plumbing at 972-509-0224, or fill out our online request form.

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