One, the kitchen sewer backwater causes
1. Piping materials
Traditional cast iron pipe rough, easy to aging, rust, resulting in dirt deposits. Therefore, it is recommended to use plastic drain pipes and centrifugal cast iron pipes when building a new house or replacing pipes. It has the advantages of smooth inner wall, dirt is not easy to accumulate, and water permeability is greater than drainage cast iron pipe.
2. Hydraulic conditions
Common residential drainage is gravity self-flow drainage. Domestic sewage first through the sanitary equipment into the drainage standpipe, and then into the drainage pipe, and finally into the outdoor drainage check well. When the sewage flows to the bottom of the drain trap and is about to be transferred to the drain trap, a momentary blockage occurs and a short period of positively pressurized water column forms at the bottom of the drain trap. At this point, if hydraulic conditions are poor, for example, if the drain riser and drain cross-pipe are not connected by two 45-degree elbows, if the drain cross-pipe is of a smaller diameter and has a smaller slope, or if clogging occurs, these conditions will result in the formation of a higher positive pressure water column. Finally, if the positive pressure water column is higher than the kitchen sanitary ware, sewage will overflow and form reverse water.
3. Housing Settlement
Generally, the weight of the house itself and a poor foundation, coupled with a lack of attention to construction, will result in excessive settlement of the housing, with the pressure leading to drainage and drain piping consequences. In this way, the gradient of the drainage outlet pipe gradually slows down, or even reverses the gradient, and in severe cases destroys the drainage outlet pipe, leading to poor drainage, and therefore kitchen sewer reversal.
4. Floor
Usually, the first floor is a separate sewer, the water pressure is very low, so it is not easy to clog. However, the second floor and above the floor often use the pipe, and the clogging location is usually in the sewer manhole cover to the first floor of the 90-degree corner location, so the sewer return water mostly in the second floor.
Two, the kitchen sewer backwater how to do
1.solution: first, in the design of the house should be considered all the adverse factors. Drainage pipe should be arranged to meet the best hydraulic conditions. Therefore, special attention should be paid to:Drainage riser and drainage cross-pipe connection. It is recommended to use two 45 or elbows with a bending radius of not less than 4 pipe diameters. Drainage pipe should be connected as straight as possible, less rotation, drain pipe diameter and slope appropriately increased.
2. Piping problems in the past, the house's drainage pipe is generally sand mold cast iron pipe. Rough inner wall, easy to hang dirt. Anti-corrosion is not easy to rust, resulting in poor drainage. Plastic drainage pipe and mechanical centrifugal cast iron pipe with smooth inner wall, dirt is not easy to accumulate, resulting in blockage.
3. Piping problem solution: for the completed house, if the piping problem caused by the bottom of the house back to the water problem is very serious, you need to rebuild the original drainage pipe. In this case, plastic drain pipe or mechanical centrifugal cast iron pipe should be used.
4. The slope of large houses settling drainage trunk pipe generally meets the standard slope during construction. Sewage flow in the pipe can reach the self-cleaning flow. House due to self-weight and due to its own weight and foundation and settlement is normal, but in the design and construction process did not get good attention and take appropriate measures, resulting in a large number of house settlement. The house, the drainage from the domestic pipes was squeezed, resulting in drainage. Even if the slope is reversed, the gradient of the domestic pipes is reduced. In severe cases, the drains will be crushed, resulting in poor drainage.
The above is what we bring to you about kitchen drain backflow.