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Shower Cold water Hot water Vent pipe Fig. 13-1. Plumbing system layout, showing water supply, drain and vent pipes for a typical one-family, two-story house.
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to 1 inch for the water pipes. In some communities, the house drain line leading to the sewer must have a house trap. The trap is usually located inside the house near the foundation wall. Its purpose is to provide a seal and prevent the gases that occur in the sanitary sewer from circulating back through the plumbing system. When there is a house trap, there should also be a fresh-air inlet pipe connected to the main drain. This air inlet pipe is
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located on the house side of the drain approximately 1 foot from the trap. (See FIG. 13-2.) In cold climates, it is located about 5 feet from the house trap to prevent the water seal from freezing during the winter. When the outer end of the fresh-air inlet terminates on the outside of the foundation wall, it should be covered with a perforated metal plate that admits the air and prevents obstruction. When it is freestanding, it should be covered
160 Plumbing
ture traps, which prevents the waste water from siphoning the water seal out of the drain trap. (See discussion on fixture traps in chapter 10, page 119.) Venting in the drainage system is achieved by vent pipes connected to the drain line near each fixture trap and to a pipe that terminates above the roof line. This pipe, called the vent stack, is visible from the outside. Vent pipes must be unobstructed. They carry no water or wastes.
Waste-disposal system
Waste disposal from a residential structure will be either through sewers connected to a community waste-treatment plant or through a private disposal system such as a septic tank or cesspool. When all other items are equal, a house with a sewer is more desirable than one with a private disposal system. Sewers are relatively maintenance-free. On occasion, there might be a blockage, which can usually be cleared at low cost by using a drain auger ( plumber s snake ). Maintaining a private disposal system, on the other hand, can be quite costly. Whether the house is serviced by a sewer or is connected to a septic tank usually cannot be determined during an inspection. The house drain line passing through the foundation wall is the same regardless of whether there is an exterior connection to a sewer or to a septic tank. Since not all municipalities require a house trap on the main drain, the absence of a trap does not mean that there are no sewers. And just because there is a sanitary sewer in the street, it should not be assumed that the house is connected to the sewer line. Tying into the sanitary sewer (if the connection is permitted) is at the homeowner s expense. I know of several instances where homeowners elected to stay with their septic systems rather than go to the expense of tying into the sewer.
Fig. 13-2. House trap on main drain line leading to a sewer. Fresh-air inlet pipe on house side of the trap terminates on the outside of the foundation wall. with a cowl or gooseneck. (See FIG. 13-3.) The function of the fresh-air inlet is to maintain atmospheric pressure at the house trap and to ensure complete air movement within the drainage system. With a private sewage system (septic tank), a house trap on the drain line is not needed. The gases that are generated in septic tanks are usually discharged to the atmosphere through the house drainagevent system. Venting is needed in the drainage system, since it provides a means to discharge to the atmosphere gases that develop in the system. It equalizes the air pressure in the drainage system by allowing air to flow into and out of the drainpipes. This free air movement maintains atmospheric pressure at the various fix-
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