How to connect sewer pipes

26-04-2018

Useful

If you are faced with the need to lay sewers and you do not know how to connect sewer pipes, do not worry: remember your childhood and play ... in the constructor.

The fact is that modern pipes for this purpose are made of PVC (plastic, more simply). And for the convenience of their installation, they are issued strictly defined diameter and length. Well, since the pipes are not always laid only strictly straight, to them in any store selling such goods, you can find swivel fittings. All this is very similar to the children's designer, as the elements of the sewer system, if you don’t particularly delve into the process itself, are simply inserted into each other. As a result, you get a strong and reliable connection that does not leak, does not let the unpleasant smell and can serve you for a long time without replacement or repair.

Fitting

Но давайте вернемся к фитингам. Fitting – это дополнительные элементы к трубам, помогающие их соединять в единую конструкцию. Принято различать фитинги в зависимости от:

designs - turn signals (squares), tees, couplings, extenders, plugs, etc .;
assignment - connecting and intermediate;
Forms - L-shaped, T-shaped, straight.

You should not think that all the fittings listed above are different elements. In fact, the same fitting is in each line of the classification under a different name. Take, for example, a coupling that serves to connect two sewer pipes. By design, this fitting will be just a "coupling", by purpose - intermediate, in shape - straight.

Based on a similar classification of fittings, it is much easier to imagine what exactly you need in order to connect the pipes into one design.

We collect sewage system for the house or apartment

Before understanding how to connect sewer pipes, it is necessary to understand the principle of assembly of all system of the sewerage.

So, all the work should begin with the creation of a drawing in which you must depict your future system. Take a piece of paper and draw on it schematically all plumbing appliances that need to be connected to the sewage system (sink, toilet, shower or bath, etc.).

Then connect them with lines to the main sewer. Each line is a pipe. The pipes will be interconnected using fittings.
Please note that sewer pipes in the house usually have only two types: with a diameter of 50 and 110 mm. Fifty millimeter ones are designed to drain drains from sinks, sinks, bathtubs and showers, as well as from washing machines and dishwashers. If there are too many plumbing devices on one line, then its diameter should be increased to 110 mm, otherwise you will often have problems with blockages.
But the toilet is connected only through a pipe with a diameter of 110 mm, while the connection of the sanitary device itself is usually made using flexible corrugations, which is inserted into the sewer pipe.

Having understood what elements your sewer system consists of, it is possible to go to shop. Since it is almost impossible to spoil sewage pipes when working with them, you should not purchase components with a margin. Most importantly, do not forget that each pipe at one end has an extension into which another pipe will be inserted. If you cut the long pipe with a hacksaw (the cut must be strictly perpendicular) into two parts, then the second element will not have such an extension, and in order to connect it to another pipe or fitting you will first need to install the coupling. In this case, the cost of different sets of pipes (one with a coupling or two short) will be approximately the same.

The first in the sewage system will be a fitting-turn signal, to which you will, on the one hand, connect the flexible hose of the sanitary device (siphon), and on the other, the pipe. You can, of course, do without this fitting by connecting the siphon directly to the pipe, but in this case, if the joint is not tight, there is a possibility that the joint will leak.
When inserting a pipe into a fitting (or vice versa), be sure to observe two conditions:

a rubber gasket should be laid in the joint (it is sold in the kit);
the pipe must enter the fitting (or another pipe) to the full possible depth.

Further, in places of connection to this pipe of other plumbing, fittings-tees are put. If you need to connect pipes of different diameters, use a special fitting adapter.
When collecting sewers, do not forget about creating the necessary pipe slope, otherwise your system will not ensure the removal of fluid.
To assemble the system, it is necessary to move from the sanitary devices to the main riser so that the joints do not interfere with the flow of water.

Outdoor sewage

Unlike in-house or in-house, external sewage (built on the local area) is assembled without swivel fittings. Instead, it is recommended to arrange wells - they will facilitate cleaning. After all, all the pipes will be hidden in the ground and it is quite difficult to dig them out every time they become clogged with you, and cleaning through fittings that go to the surface of the ground is not always possible.

Of course, pipes for outdoor sewage have a larger diameter than pipes in the house.

Each of them, cutting into the outer tube, increases its diameter by one size.

If the outer tube is common to the other two with a diameter of 110 mm, then its diameter should not be less than 160 mm; for three pipes of 110 mm each - with a diameter of at least 200 mm. This rule applies to small buildings, provided that the distance to the nearest sewer does not exceed 30-40 meters. In other cases, the outer tube must have a larger diameter in order to work “with a margin”.

Video

Most often in the process of installing sewage it is necessary to connect pipes of different diameter. Therefore, we suggest you to watch a useful video covering this issue: