Build Daily

Engineering Systems

August 12, 2017 18:07

PVC sewer - ideal for the replacement of metal pipes

PVC sewerage, its advantages and disadvantages

For more than 30 years have passed since the PVC was first tested as a material for sewer pipes.Perhaps you immediately the question arises, why was not carried out widespread replacement of cast iron drain, cumbersome and not very reliable.But, we must admit, the first experiments with PVC were not very smooth and not one year has been spent on it to create a flawless production technology of high-quality PVC pipes.And then began the test of time, after all should know for certain how long it will last PVC sewer.The results were more than satisfactory, the service life of the pipes of the above material with careful operation can reach more than 300 years.It was found thanks to a serious test, which were subjected to 200 mm PVC pipe, which for 135000 cycles (which corresponds to 195 years) were driven sand.The wall thickness decreased slightly, by only 0.118 of 2.05 millimeters.

Reliability plastic sewage proved conclusively over, it is also known that PVC

excellent resistance to direct ultraviolet radiation , and, in addition, it has a relatively low coefficient of thermal expansion.But we can not keep silent about some of the shortcomings of PVC.Thus, for example, low temperatures make the plastic brittle PVC, thereby to lay sewers within the soil freezing is risky without proper insulation.What can we say about the transport or installation of PVC pipes in the frost.It should be noted, and a fairly low heat resistance of PVC, prolonged exposure to temperatures above 75, or short-term over 95 degrees Celsius can lead to destruction of some sections of the pipe or fitting.

PVC rather unstable before exposure to organic solvents, causing a gradual erosion of the walls with the appearance characteristic of plaque, which, however, less pronounced than a similar cast-iron pipes.

Plastic sewage from PVC and its possible alternatives

use of PVC plumbing is extremely convenient - no matter what the diameter of plastic pipes for sewers, they have a fairly lightweight and can easily be connected to each other through fitting of various modifications.Incidentally, the diameters of which there are many, ranging from 110 millimeters with a wall thickness of 3 millimeters, 500 millimeters and ending at the wall thickness 12.3 mm.For each pipe diameter there are appropriate fittings: elbows, tees, reducers, elbows, couplings and plugs.However, in spite of the obvious benefits of using PVC sewer negative properties it enough, so sometimes you can use PVC alternatives.Similar characteristics, but with far fewer defects are pipes of unplasticized polyvinyl chloride, or PVC-U, and plastic drainage of polypropylene (PP).

noteworthy that the drainage of the PVC-U is quite cold-resistant.Additionally, it resists the effects of various fine chemicals, including solvents.Due to the fact that the hydraulic characteristics of sanitary ware PVC-U does not change under any circumstances, because this material is obtained an excellent pressurized sewage, which can even serve as a worthy substitute for steel pipes.When laying sewer pipe PVC-U and the maximum diameter of the maximum possible length easily can pick up a few people, which eliminates the use of construction equipment, with the exception, perhaps, of the excavator (bucket shovel bad opponent for a few cubic meters).Sewer Polypropylene has a greater wear resistance, and it is excellent thermal resistance and can withstand prolonged exposure to temperatures above 95 degrees Celsius.At low temperatures, resistance to mechanical stress from the polypropylene increases.The only drawback of PP pipes - they do not withstand UV radiation.

Mounting plastic sewage - an extraordinary simplicity

connection Sewer pipes are rarely purchased in store, usually buy them when there are problems to be solved.Therefore, to be assembled, the complexity of which depends on the pipe material.If you've never done installation of sewage cast iron elements, you are very lucky, because the fittings to connect pipes made of this heavy metal is quite difficult.No O-rings, it is necessary to work with hemp, clay and mastics, which is why there is always the possibility of a leaky connection.Another thing, if you need to carry out installation of plastic sewer, whether PVC or polypropylene.Each tube of PVC or PP has a socket at one end which tightly encloses the opposite end of the same pipe.Just insert one tube to another and in order.The fact that inside the socket has a plurality of annular ribs between the outermost of which has at the factory of the sealing ring is inserted a special rubber, which provides qualitative and sealing.Many strength to use glue, putting it on the smooth end of the pipe immersed in the socket.

If you know the device sewage, laying of pipes is not easily reach, just need to follow some rules.For example, given the continuous movement of large volumes of water from top to bottom in domestic sewage riser pipes must be installed flare up.In general, socket should always be turned against the movement drains, it will increase the reliability of the joint sealing and eliminate the possibility of blockages.Of course, the safety net can be used and silicone sealants.In order to connect plastic pipes with the same diameter of metal, there are coupling.If you need to connect pipes of different diameters, it is necessary to use special "transitions".Trenches for laying of street sewers, which is constructed from special pipes with thicker walls, it is necessary to dig a given slope, the required effluent (from 1 to 45 degrees) for free movement.However, if all of a sudden the trench was too deep, just enough to lift its bottom by throwing more than the ground.Land necessarily gives way, so you need to pour the concrete floor and into his already hardening to begin to lay the pipe on a special sand sprinkled on top of the pillow.With proper persistence you'll get an excellent drainage.