Sewer manholes
Some sewer manholes are made of Polyethylene. It can bend and flex with various loading conditions. This toughness means fewer potential leaks and longer life. Lightweight polyethylene manholes are easy to install.
Smaller pieces of equipment can be used to position these manholes. Inlets and outlets are correctly positioned during the manufacturing process. These inlets and outlets are extrusion-welded into place to be leak-free. Polyethylene offers a wide range of chemical resistance to acids, bases, and many organic compounds. Because of this resistance, chemical attack from hydrogen sulfide and sulfuric acid does not occur.
Because polyethylene manholes provide the highest level of reliability, applications vary from sanitary sewer uses to handling toxic chemicals.
In sanitary sewers, hydrogen sulfide is the primary cause of corrosion. Hydrogen sulfide is converted to sulfuric acid, which attacks concrete and eventually destroys concrete manholes and pipe. The corrosion resistance of polyethylene and its toughness make it a natural for manholes. Polyethylene manholes remain leak-free because there is no chemical attack. The toughness of polyethylene eliminates the chance of cracking during installation.
Plants with corrosive chemicals in their underground pipes are experiencing the benefits of corrosion resistant, high-density polyethylene pipe and manholes. This leak free system means less pollution and lower operating costs for chemical plants.
By butt fusing high-density polyethylene pipe and flanging the manhole connections, a very tight system is achieved. ISCO Industries’ manholes are engineered to fit precisely and all joints are extrusion-welded to prevent leaks.
The pulp and paper industry is a frequent user of HDPE pipes and manholes. The effluent is most often corrosive and may also be abrasive as well. Since high density polyethylene pipe and manholes are corrosion and abrasion resistant, they work well for many industrial and chemical applications.