Design and installation of pipelines for internal drains

The fittings for the connection lines stated in SN 75 6760 can be mounted at first sight. All these batches are based on the requirement that the discharge of waste water from the locks without removing the holes and the backgauge is sufficient.

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The pipe work is referred to as a pipe between the locking element or the floor drain (through the shutter) and the drain or drain pipes. In practice it is now possible to assume that the pipeline is only connected to the pipe with the aid of the largest number of fittings (fig. 1), which is currently a large market. Apart from the drainage of waste water, the bag must be thrown away via every pipe channel in order to prevent water from coming out of the pits and that the waste water then ends up in the drainage hoses of the locks.


Figure 1 – Connections of connecting pipes with branches with unsuitable posts. There are also a large number of knees with shaft 87 (see section 2.3) in the pipeline line in figure "b" and the reduction is insufficiently applied. The connecting pipe in Figure A is fed to the damaged integrity of the wall and connected to the drainage channel is terminated by a too small brewing valve, which is not complete after the bathtub,

2 of the connection pipes

The connection lines may not be invisible or blown. The connecting pipe is connected to the pipe that connects it with the outside air to the air in the air when the water is being drained, and this reduces the vacuum in the pipeline, which could cause the gear to move. The winding pipe is replaced by a brewing valve (Figure 3), which also blows the air piston under vacuum. When installing a non-return pipe (without duct or drain valve), it is necessary to add straight diameters and to let the drain pipes run away and the underpressure not too high. The basic set of non-limiting values ​​for the use of non-taped pipelines on which the bed is:

  1. the highest spd;
  2. the longest;
  3. the highest number of knees with a height of more than 67.5;
  4. least tendency.
2.1 Maximum spindle of non-tapped pipes
Figure 2 – Spdov vka H pipelines (SN 75 6760)

The expansion (Figure 2) is connected to the non-capped connecting pipes with the flow and therefore, in the case of large pipelines with the same diameter, it differs. The maximum flow is 1 m and the connection DN 70 and DN 125 and 2 m. Connection lines DN 100 with max. Span and 2 m, if not connected to mso or drain with drainage DN 100 (water discharge max. 1 7 l / s). The springs may not be present at all for connecting pipes DN 50 of drainage pipes DN 50 (off, from, etc.) and DN 40 connecting pipes.

2.2 The largest number of non-taped pipes

The length of the threads without threads must not exceed 4 m. For easy installation (equipped with fittings or easy disassembly), the length of the non-threaded pipes DN 50, DN 60, DN 70, DN 100 and DN 125 init and 6 m.

2.3 The highest number of knees in non-tapped pipes
Figure 3 – Place the swing flap above the cassette, the opening is securely fastened, the bag is fitted with the air inlet

Knees with large spikes can cause obstruction and overloading of pipes, resulting in underpressure and mono offshore holes. That is why the number of knees with more than 67.5 elbows is limited to the highest. If the slurry or drain pipe with DN 100 outlet is connected to the connecting pipe, the number of knees with a heel higher than 67.5 is limited to a maximum of one. This cone has no connecting knee for a click connection, which is often 90.

2.4 Minimum slope of non-tapped pipes

The slope of the connecting pipes must not exceed 3%. For connection pipes DN 100 and DN 125, the slope is at least 2%.

2.5 Limit values ​​for the use of ventilation ducts

As noted above, the manifold manifolds are either sprayed under vacuum, either by an external air duct or by a hot water valve for domestic use. For this reason, the limit values ​​for the use of the connecting pipes are not as strict as for the non-connecting pipes (see in). Their length is 3 m, length and 10 m (if monostin), the number of knees with a heel of more than 67.5 is limited only to the ducts of the entrance and the drag (at most one). The least slope can be the same as for non-tapped pipes.

Therefore, if it is not possible to meet the limit values ​​for the return lines, it is appropriate to design the connection pipe of the ventilation openings with the vent valve, which must be dimensioned in the inlet. The coffee making system must be easily accessible and the air supply must be secured (fig. 3).

2.6 Use of fittings on pipes

The knee was poured. To avoid repairability, the lines of the connecting lines should only be used with branches up to 60 (usually with 45). Beams with an axis other than 60 may only be used on the vertical connections of the pipes (fig. 4).

Figure 5 – Installation of a double compartment (channel) on the mills ms pipeline
Figure 4 – Installation of branch, double and ice trays on the pipeline (SN 75 6760)

Double pipes (potted pieces) must be installed on the pipeline with vertical drainage (Fig. 4, Fig. 5) if their maker has no other way of fitting. The eccentric reductions applied to the connecting pipe must be equipped with a flat top surface, not as shown in figure 1b.

A pipe fitting (Figure 4) is suitably connected to the pipe work of the pipe work of the pipe work.

2.7 Connection pipes for drain pipes

For the connection of pipelines to the drain pipes, the R can be connected to branches 45 and 88.5. In some other countries you prefer the 87 and 88.5 horns, because there is a fear of vacuum in the pipeline when it is flooded in the marsh on the sides.

Figure 7 – Use of angles for connecting pipes from masonry to unfinished waste water drainage

Experiences and investigations were not confirmed by a relatively low vacuum in the correctly dimensioned connecting pipes, which would result in the removal of the holes. When connecting the pipes to the pipeline, it is not possible to use the branches with a 75 mm heel, because no retention of the sewage water in the openings between the bottom of the pipes is connected to the drain pipe and the water level in the vertical connection of the holes is vertical or in the internal diameter pipeline conduit ID (Figure 6).

Figure 6 – Connection of the connection pipes when connecting to the discharge pipe by means of heels with a height of 75 (SN 75 6760)
Figure 8 – Tipping of pipelines from masonry ms

When connecting pipelines from masonry or drain pipes with DN 100 to the drain pipe through double connections with a heel of no more than 67.5 mm, it is not necessary to connect the connecting pipelines against each other, but in the upper planes, Figure 7. In the case of masonry faults, the pipes must not delay the discharge of water during flushing. For this reason, it is necessary for the mesh connections to be made such that the pipe fittings or pipes directly behind the staircase have a slope of at least 15 (figure 8).

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The fittings for the connection lines stated in SN 75 6760 can be mounted at first sight. All these components come from a single need to ensure adequate drainage of waste water from the locks without removing the deadlocks and backgauge. The couplings, caused by unsuitable return and installed by the pipes, are very difficult to remove because of the necessary masonry and tiling.


  1. SN EN 12056-2 Internal sewerage – Gravitante systems – st 2: Sewer slurry – Design and evaporation
  2. SN 75 6760 Internal drainage system
English synopsis
Design and installation of internal drain pipes

The principles are set out in CSN 75 6760. Priority is given to sufficient drainage of waste water from equipment without extraction of odor seals and backflow.

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