What causes backwater in kitchen drains

If there is a blockage, it is likely that there is a blockage under the main sewage pipe, once the sewage is not smooth, the sewage will be reversed to the nearest outlet from the blockage, in this case, you can only dredge the pipeline company. If your home is on the second floor, and the water in the sewer is reversed to your home, it can be said that the pipe below the second floor is blocked, and this blockage is the main pipe blockage, that is, the total sewer blockage from the first to the seventh floor, and the blockage position is generally in the sewer manhole cover to the bottom of the first floor 90 degrees bend, so the sewer backwater is more than the second floor. The hydraulic conditions are not good, and the residential drainage is generally gravity self-flowing drainage, and the sewage is discharged into the drainage riser by the sanitary appliances of the residence, and then discharged into the drainage horizontal trunk pipe.

Finally, it is discharged into the outdoor drainage inspection well. Generally, the drainage speed of the drainage riser is greater than that of the drainage horizontal trunk pipe, and the sewage will be instantaneously congested when it is discharged to the bottom of the drainage riser and transferred to the drainage horizontal trunk pipe, and a short period of positive pressure water column is formed at the bottom of the drainage riser, if the hydraulic conditions are not good (such as the drainage riser and the drainage horizontal trunk pipe are not connected with two 45 ° elbows, the diameter of the drainage horizontal trunk pipe is small, the slope is small, or when the blockage occurs), the positive pressure water column is formed relatively high, and when the positive pressure water column is higher than the sanitary appliances of the ground floor residence, Sewage overflows from the sanitary appliances of the ground floor dwellings, which is commonly referred to as sewer backwater. Pipe ProblemIn the past, the drainage pipes of residential buildings were generally sand mold cast iron pipes, with rough inner walls, easy to hang dirt, and easy to rust if the anti-corrosion was not done well, resulting in poor drainage.

The plastic drainage pipe and the mechanism centrifugal cast iron pipe have a smooth inner wall, and the dirt is not easy to hang up and cause blockage, and the water passing capacity is 10% 26% larger than that of the sand mold drainage cast iron pipe. Local construction committees have explicitly prohibited the use of sand mold drainage cast iron pipes in new residential projects, and promoted the use of plastic drainage pipes and mechanism centrifugal cast iron pipes. The slope of the drainage trunk pipe during the construction of the house is large, and the slope of the drainage trunk pipe generally meets the standard slope, and the flow rate of sewage in the pipeline can reach the self-purification flow rate.

It is normal for the house to settle due to its own weight and unreal foundation when it is first built, but it is not attached great importance to the design and construction, and corresponding measures are taken, resulting in a large amount of house settlement, and the drainage outlet pipe is pressed, resulting in the reduction of the slope of the drainage outlet pipe, or even the reverse slope, and the drainage outlet pipe will be crushed when it is serious, resulting in poor drainage.

There are three reasons for backwater in kitchen drains:

1. Poor hydraulic conditions.

Residential drainage is generally gravity self-flowing drainage, and sewage is discharged from the sanitary appliances of the house into the drainage riser and then into the drainage trunk. Finally, it is discharged into the outdoor drainage inspection well. The drainage speed of the general drainage riser is greater than that of the drainage horizontal trunk pipe, and when the sewage is discharged to the bottom of the drainage riser and transferred to the drainage horizontal trunk pipe, it will produce instantaneous congestion, and a positive pressure water column will be formed at the bottom of the drainage riser for a short time, if the hydraulic conditions are not good, (such as the drainage riser and the drainage horizontal trunk pipe are not connected with two 45??).

When the positive pressure water column is higher than the sanitary appliances of the ground floor residence, the sewage overflows from the sanitary appliances of the ground floor house, which is commonly called sewer backwater.

2. Pipe problems.

In the past, the drainage pipes of residential buildings were generally sand mold cast iron pipes, with rough inner walls, easy to hang dirt, and easy to rust if the anti-corrosion was not done well, resulting in poor drainage. The plastic drainage pipe and the mechanism centrifugal cast iron pipe have a smooth inner wall, and the dirt is not easy to hang up and cause blockage, and the water passing capacity is 10% 26% larger than that of the sand mold drainage cast iron pipe. Local construction committees have explicitly prohibited the use of sand mold drainage cast iron pipes in new residential projects, and promoted the use of plastic drainage pipes and mechanism centrifugal cast iron pipes.

3. The settlement of the house is large.

During residential construction, the slope of the drainage trunk pipe generally meets the standard slope, and the flow rate of sewage in the pipeline can reach the self-purifying flow rate. It is normal for the house to settle due to its own weight and unreal foundation when it is first built, but it is not attached great importance to the design and construction, and corresponding measures are taken, resulting in a large amount of house settlement, and the drainage outlet pipe is pressed, resulting in the reduction of the slope of the drainage outlet pipe, or even the reverse slope, and the drainage outlet pipe will be crushed when it is serious, resulting in poor drainage.

There is only one situation, and that is when the sewer is clogged or close to clogged, making the drain poor.

If you live in a lower floor and have no water in your home, it means that the main sewer pipe is blocked or not smooth, and the sewage upstairs cannot be discharged from the main pipe in time, and the drainage volume is relatively large, and it will regurgitate or overflow in the sewer pipe on the lower floor.

Handling of this situation.

1 Eliminate the problem of your own sewer pipes, if it can't be solved--- 2 Clean the drain through the property or pipe cleaner.

One is that the pipes of the water flowing from the pool above are shrunk and not inserted deep enough.

The second is that there is something in the sewer and it is blocked.

Install an anti-sewer pipe in your home, and if it doesn't work, seal the sewer outlet.