HT or KG sewage pipe - the differences
Sewer pipes can be found in different designs. On the one hand the HT pipes (high temperature pipes). They are gray and made of the plastic PP (polypropylene) and are designed for the sewer pipes inside the house. They can have diameters of 40, 50, 75 and 110 millimeters, with the different diameters being designed for different uses.For the wash basin, for example, a diameter of 40 millimeters is sufficient. For the toilet, however, it has to be 110 millimeters.
The KG pipes (sewer base pipes) are orange-brown and designed for outside sewage drainage. So you connect the pipes of the house with the sewer system. KG pipes are laid in the ground and are available with diameters of 110 and 125 millimeters. For connecting the house to the sewer system, only the KG pipes can be used.
Reinforced KG pipes as a special shape
They are usually green, not orange-brown, and are designed to be used in high-traffic areas. For example, they are used in places where cars are parked more often. When selecting and planning, more heavily polluted areas on the property should also be taken into account.Planning and requirements
Before laying the sewer pipe, the route must first be planned. Which pipes are used depends on the one hand on the local regulations and on the other hand on the circumstances. In order to avoid mistakes, laypeople and hobby craftsmen should inform themselves about the applicable regulations in advance.In general, however, the following points apply:
Trench depth
The sewer pipe is laid at a depth of 100 centimeters. The trench must therefore have a corresponding depth. An exception are more heavily used areas where there is a lot of traffic, for example. Here the trenches must be 150 centimeters deep.
gradient
The pipes must be laid with a gradient of one to two percent. This means that a gradient of one to two centimeters must be planned for one meter of pipe length. With a total laying length of 50 meters, there must be a gradient of 50 to 100 centimeters. This must also be taken into account when creating the trench.
filling material
To protect the pipes, they must be laid on sand and, first of all, also covered with sand. On the one hand, this measure ensures that gravel and sharp stones cannot damage the sewer pipes. In addition, the sand layer ensures better pressure distribution.
angle
Only arcs with an angle between 15 and 45 degrees may be used to change direction. Only 45 degree bends can be used for junctions.
load
If the sewer pipes are laid under a parking lot or another heavily polluted area, reinforced KG pipes must be used. For other areas, however, the normal KG pipes are sufficient.
preparation
Appropriate preparation is required after the planning so that the sewer pipes can then be laid without any problems. This includes the following steps:1. Dig a trench taking into account the necessary slope. The trench should be wide enough for the pipe to be centered in it without any problems.
2. Remove stones and roots from the trench.
3. Compact the earth in the trench.
To ensure that the slope is created correctly, it should be precisely measured again after the soil has been compacted.Tip: Because of the required depth of the trench, it is very time-consuming to dig it by hand. It is therefore worth renting a mini excavator.
Lay sewer pipes
When the preparations have been completed, the subsequent laying and connecting of the pipes is comparatively easy. Only the following steps need to be taken into account: 1. Cover the bottom of the trench with a layer of sand ten centimeters thick. This serves to protect the
Soil.2. Laying begins at the lowest point of the slope so that the sleeves point against the direction of flow of the sewage.
3. The first tube is inserted and connected to the second tube by pushing it into the connection. It is helpful to use an appropriate lubricant, as it makes it easier to slide over the rubber seal. The two pipes are attached to each other with pipe clamps.
4. The pipes are centered in the trench and covered with sand up to a trench height of 30 centimeters each.
5. The sand layer is compacted - but only by hand. Under no circumstances should heavy equipment be used here, as this could damage the pipes.
6. The earth is applied in layers and, like the sand, compacted by hand. A corresponding device may only be used for compaction from one meter above the pipe.
Cut pipes
For the outside sewer it may be necessary to shorten individual sewer pipes. Since the edges of the original pipes are beveled on the outside and inside to make it easier to slide into the socket, there is more to the adapted shortening than sawing off.1. The pipes are measured and the cut edges are marked. So that a straight cut can be made, several markings should be measured and set on the pipe with a ruler and a pen and only then connected to each other.
2. The pipe is placed on a table so that the excess pipe section protrudes over the table.
3. The pipe is shortened at the marked point with a saw.
4. The cut edge is beveled inside and outside with a file.
5. The cut edges are smoothed with sandpaper so that the rubber seal of the connecting part is not damaged.
Even after cutting, filing and smoothing, lubricant should be used on the connections to make it easier to insert them into the connecting elements of the pipe system.
