Technical properties of cast iron sewer pipes
There is no exaggeration in the title. Cast-iron sewage pipes of good quality do have a service life of up to 100 years under normal operating conditions. Most importantly, unlike their plastic counterparts, the gray pig iron pipelines with alloying additives have long confirmed their high working status. Due to what? Let's understand.
In the world markets of water supply equipment, pragmatism always ruled. The cheaper and more reliable the pipeline system, the easier it is to sell to the end user and insure against claims and lawsuits. Cast iron pipes for sewage very rarely failed their producers, saving decades of practically unchanged manufacturing technology. What is good about them?
- Mechanical properties of .Ideal they can not be called. Products even made of magnesium, chromium, titanium or other chemical additives of cast iron retain a weak resistance to external influences. On the other hand, the pipes for sewerage work in ramjet free-flow systems where their internal strength characteristics are much more important and in our opinion the best.
- Corrosion resistance .In this component, gray cast iron is quite comparable with modern plastics. With qualitative treatment of internal surfaces during the formation of formation, there are no obvious foci of corrosion on the internal surfaces of the pipeline, and the "collapsing" of local ones occurs naturally.
- Technological qualities of .They appear both at the stage of production of cast-iron sewer pipes, and during their installation and operation. Low coefficient of thermal expansion, high( due to the thickness of the walls) effect of sound insulation, ecological purity( natural material without synthetic impurities).
If we add high temperature stability, absolute indifference to fires and a practically zero process of deterioration of the internal surfaces of pipes, then their first place in this segment of the market can be considered quite natural.
Installation of the sewage system from cast-iron pipes
Before wiring the fan system it makes sense to familiarize with GOST 6942-98, where practically all such pipelines are said. Some important points:
- cast-iron pipes for internal sewerage and fittings for them are made with a diameter of 50, 100, 150 mm;
- bitumen coating of internal and external surfaces should keep the softening temperature up to 60 degrees;
- maximum temperature regime - 400 deg.
- connecting elements( indents, couplings, straight and angled tees, cross pieces, plugs, etc.) are selected from the range of one manufacturer.
Cast iron pipes 50 provide a convenient layout of networks within the house, and an outlet to a diameter of 150 ensures a guaranteed discharge of sewage into the general fan system. When choosing, it should be taken into account that three values can be present in the product passport:
- internal, nominal setting diameter( Dn or Dn);
- Outer Diameter: Indicator is important, but often derived;
- pipe wall thickness, which defines the conditional pass section.
The installation of the system is made by simply inserting a straight section of one part into the shaped part of the other and sealing the gap with a tarred hemp tow. The bell, of course, is located in the direction opposite to the drain. Branching schemes are organized in the same manner.
Cost of cast-iron pipes for sewerage. The issue of price.
Us, ordinary townsfolk, most often worry about two questions: how much this thing will cost and how much it is heavy. For the most curious, we inform you that a 2 m long pipe costs and weighs about as much:
| Diameter | Wall thickness | Weight, kg | Price, rub. |
| 50 | 4,0 | 11,0 | 800 |
| 100 | 4,5 | 25,1 | 1260 |
| 150 | 5,0 | 40,3 | 2280 |
As you can see, installing such sewage pipes in country houses is profitable even economically, especially taking into account their endless service life. Transportation and installation costs will be repaid in a year.
