Cast iron sewerage: characteristics and features
The unshielded cast iron sewage system has both advantages and disadvantages. To the merits of such a sewer system can be attributed to the quietness in comparison with the analogs for the sewage system. Cast iron does not melt, does not burn, does not emit toxic substances.
The absence of sockets makes joints and joints more leakproof and does not require the use of special sealing materials. Cast iron pipelines are resistant to temperature changes. The thickness of the walls is the same over the entire length, which increases the strength and durability of the system. Due to the relatively low coefficient of linear expansion, cast iron pipes can be concreted without problems.
The main drawback of this sewage system is a significant mass and a fairly high consumption of metal during production. Cast iron systems should not be used in seismically active zones, in areas with weak soil and in solonchak soils, where cast iron rapidly loses its strength.
How to properly dismantle?
At major repairs of dwellings it is often necessary to replace cast-iron sewerage. For this you may need: a hammer, a chisel, a bulgarian, a gas burner. The first thing to do is to break pipes with a chisel, you should leave only the element that enters the riser. In order to provide access to the connection, it is necessary to cut the bulgaria as much as possible of the cast-iron pipe.
Since sulfur is used for the joints, it must be heated before it becomes liquid. Using a gas burner, heat the connection and remove sulfur from it. Clearing all connections, you need to loosen them. If all the sulfur has drained or burned, then the dismantling of the cast iron sewage system is almost complete .From the tee of the riser, all sulfur is removed, and it remains to cool. When burning, special attention should be paid to fire safety.
Peculiarities of installation of cast iron sewage system
Installation of cast-iron sewage is carried out on the same principle as any other. The first thing to do is make the right markup. The slope of the pipe should not be less than a centimeter per meter. When making a screed on the floor, you should leave a few centimeters of emptiness under the bell of the tee entering the apartment, because after a certain time of use the sewerage will take place and the tee will burst.
For the installation of sewer pipes, tools such as a grinder, a perforator, a shroud cutter will be needed, if it is necessary to place the pipes in the wall. There are two options for installing cast-iron pipes: using a welding machine or using connecting elements( rubber cuffs or steel clamps).
When installing pipes that enter the manifold, they must be inserted one into the other by the bell to the bottom. After that, they need to be centered, secured, and the remaining clearance is sealed with a paste, bitumen mastic, gray or waterproof asbestos-cement mixture.
The quality of pipe joints is the most important factor to consider when installing cast-iron sewers. Often, when installing such a system, fittings are used. Under the sink is better to use a pipe 50 mm in diameter, and under the toilet - 100 mm. After the installation is complete, check the tightness of all connections for leaks.
