| Drain waste and vent piping are the two most | | | | House Trap and Lateral Line |
| important components in plumbing. These are the | | | | When the plumber ties the waste water pipes into the |
| systems that take water away from your home. Let | | | | sewer line, he/she also installs house trap and lateral |
| us examine how do they work. | | | | line. The main function of the house trap is to keep the |
| Drain Waste-Vent System and Gravity | | | | waste and odors flowing out of the home, while the |
| Earlier galvanized caste iron was used in the piping | | | | lateral line ties the house to the municipal sewer line. |
| system, but now-a-days PVC piping is generally used. | | | | This lateral line first goes into a sewer system down |
| PVC piping is much better than the galvanized caste | | | | the street, and then it collects through a main |
| iron, as the later one clogs much easier. This distribution | | | | distribution line, and finally goes to a sewer processing |
| PVC piping system brings the water to the toilet bowl | | | | plant. |
| and the drain waste-vent system takes all the used | | | | Air Admittance Vents |
| water and waste away from the home to the sewer | | | | Air admittance vents are fitted under the sink. It helps |
| or septic system. | | | | sewer gases from coming out while drawing a bit of |
| The functions of most sewer systems are based on | | | | air in from under the sink. This way, these vents save |
| gravity. That is the reason why everything goes down. | | | | money for you by reducing the amount of waste line |
| In this process, the wastewater runs down the drain, | | | | vent stacks that you run. Moreover, they also help in |
| enters the waste line, and finally leaves the bowl. | | | | reducing the possible number of penetrations through |
| Supply lines in the drainage system are fitted at forty | | | | the roof. |
| or ninety degree angles. This drainage specification | | | | Other Important Things |
| goes with the flow and helps the gravity of the sewer | | | | Â - The sewage lines coming into the house |
| system to move the wastewater. | | | | must be higher than where they go to connect to the |
| The Venting System | | | | city sewer line. This is an essential requirement, as we |
| Venting system is a piping system and one of the | | | | know that the sewage moves by gravity. |
| most important components of drainage. The venting | | | | Â - There must be at least 2%-3% fall in your |
| system consists of pipes. You must have noticed | | | | sewer system. However, it depends on the elevation |
| several pipes sticking up through the roofs of the | | | | of your home as well as the elevation of the city, |
| houses in your neighborhood. These pipes are the | | | | which is the location of the connection. |
| venting system. | | | | Â - The fall the drain waste-vent system that |
| This system is also an essential requirement by the | | | | carries fluids through the sewage system must be at |
| building code, as it prevents the water to draw out of | | | | least 0.25 inch per foot. |
| the traps that are under sinks. Moreover, the other | | | | Â - There must be two-degree fall into the main |
| main function of this system is to allow gases to | | | | line for the lateral. |
| escape. It also helps wastewater to drain properly by | | | | Hence, here we see what are the components of a |
| relieving air pressure. | | | | drain waste-vent system, and how do they work. |