The use of cast-iron socketless sewer pipes is relevant for the installation of various types of sewer collectors - from central to private. Similar elements are joined with the help of special steel clamps and rubber seals. Thanks to this connection, the replacement of the emergency section of the collector is much easier.
Scope of socketless sewerage
Use cast-iron socketless tubes when creating such highways:
- sewer collectors coming from residential and industrial premises;
- storm drain system from bridges, autobahns;
- collectors for transporting aggressive waste from large industrial enterprises;
- device of the internal part of the sewage system.
Such tubes are produced by centrifugal casting using finely dispersed graphite. The result is elements with a smooth inner surface on which drains are not silted.
Types of socketless pipes
All cast-iron tubes without special connections are divided into two types:
- The internal elements. With their help, collectors are laid inside residential buildings, restaurants, hotels, hospital facilities. The most popular are the tubes of the LSU "Dyuker" (SML products for mounting the collector inside the building).
- Outdoor. Here, the elements are used to drain drains from bridges (BML) and to transport sewage through an underground collector (TML tubes).
Without fail, each type of cast-iron tube is used strictly for its intended purpose, without the possibility of interchange of one type with another.
Specifications
According to Russian GOST 6942-98 or European DIN 19522 / EN 877, all socketless elements for collectors have a single length of 3 m. The tube section varies from 50 to 300 mm. In the range between the diameter of 50 and 125 mm, tubes with a section of 70, 80, 100 mm are provided.
After 125 mm, the gradation of the sections is 50 mm, that is, pipes with diameters of 150, 200, 250 and 300 mm are on sale.
Advantages and disadvantages
The main advantages of cast-iron socketless sewerage elements are:
- inertness of the metal to the combustion / melting temperature;
- resistance of cast iron to low temperatures;
- environmental friendliness of the material (metal does not emit harmful substances into the soil / atmosphere);
- corrosion resistance due to the inner layer of epoxy resin and fine graphite;
- optimum tightness of the socketless connection;
- no need for compensators in the collector (tubes withstand pressure up to 10 bar);
- high tensile / tensile strength;
- the noiselessness of the cast-iron sewer system, achieved due to the internal coating of epoxy resin with graphite;
- ease of cutting material if necessary, change the length of the pipe;
- uniformity of thickness of cast iron along the entire length of the product;
- smoothness of the inner walls of the sewer elements, which means a good glide of sewage along the sewer;
- no need for additional system insulation;
- simplicity during repair work on one of the sections of the collector.
The disadvantages of cast-iron tubeless tubes can be attributed only to the relative fragility of the material. The sewer element may burst in severe frost with a point mechanical action of medium strength.
Mounting Features
When installing a socketless sewer system, a number of rules should be considered:
- It is forbidden to cut elements from cast iron with a gas torch.To cut them, use a hacksaw for metal or a grinder with special disks.
- Pipe cutting is carried out strictly at an angle of 90 degrees with respect to the axis of the element. Such an even cut provides further collector tightness.
- It is forbidden to cook pipes. The connection of the collector is carried out only with the help of clamps and gaskets.
- Fixing the clamp is carried out using a wrench.
In general, the installation of the system looks like a process of docking one element with another. The tightness of the fit of two sections of the collector is ensured by an internal stop at one end of the pipe. The joints of two tubes are covered with a special seal and tightened with a steel clamp. It is produced with one screw (Rapid), or with two (CV). Sound absorbing clips are also available. They are usually used in those places of the collector that pass through the floors in the room.
All cast-iron pipes having defects in the form of chips, dents, cracks are prohibited for use. The joints of the two tubes can not be additionally treated with sealant. Elastic gaskets perform this function in full.
