Drainage Tips From your San Antonio Plumbers
Drainage Renovation At San Antonio, Texas
The third component in a plumbing system is the drainage system, more properly called the DWV or drain-waste-vent system, to describe the functions it performs: draining away wastes and venting gases at the same time. Generally, the system consists of the soil stack, the waste pipes, the traps, and the vents. In operation, waste first runs out of the fixtures, say a sink. From there it enters the waste pipes, usually 1½-inch to 2-inch diameter pipes, which are sloped and lead to the soil stack.
The stack is a large-diameter pipe that runs vertically from the lowest point in the plumbing system to above the roof and out the roof. In older homes, 4-inch cast iron pipe is most commonly used. In modern homes, you will find 3-inch copper tube and 4-inch ABS (acrylonitrile-Butadiene styrene) and PVC (polyvinyl chloride) plastic pipe used. The waste then runs down the soil stack, or stack, as it is commonly called, which in turn leads to the building drain, then to the sewer line, which leads to the city sewer line, cesspool, or septic system.
As a safety measure against gases backing up into the house, all fixtures are equipped with traps (van-shaped pipe sections) directly under them, where water is trapped (hence the name trap). These provide a seal against gases and vermin getting into the house through drains. Toilets have built-in traps (toilets also have waste pipes that lead directly to the soil stack).
The most common types of traps are “P” and “S” types, so named for their shapes. There are also a house trap and a fresh air inlet where the soil pipe leaves the building. Greenbay Plumbers suggests that plumbing system must be vented for three reasons:
(1) it lets potentially dangerous sewer gases escape
(2) it equalizes air pressure in the system so that waste and water can flow freely
(3) it prevents the backup of water into a fixture that is located below another fixture that happens to be draining.
Each plumbing fixture performed at any San Antonio house is connected either to the main stack, or to smaller stacks (where the pipe would have to be run too far to reach the main stack) project through the roof: the entire system is open to the outside air. The stack itself serves as a double purpose fixture: the bottom section below the fixtures is a waste line, and the portion above is designated as a vent. At the base of each soil stack there is a clean out plug. And handy they are. For instance if you cannot clear a drain blockage with the help of a snake, you can attack it lower down in the pipe by just removing the cleanout plug and inserting your snake in there. Clean outs should also be located at each change in direction of the waste line, where the chance is greater that blockage will occur. Please visit our website