What Does Sewer Coating Mean?
A sewer coating is the protective barrier applied to the underground pipes and their connecting parts that transport domestic, industrial and commercial wastewater, rainwater and other waste materials from the sources to the treatment facilities or disposal areas. Coating is applied to protect from deterioration and damage of the inner and outer surfaces of new and repaired or rehabilitated pipes, as well as other parts of the sewerage system.
Corrosionpedia Explains Sewer Coating
The right sewer coating is an effective means of protecting the underground pipes, holding tanks, pumping stations, manholes and other components of a sewerage system from corrosion and other forms of degradation.
Although more superior materials for the sewerage systems have been developed, the wastewater from various industries, homes and commercial establishments that pass through them are full of corrosive substances that can degrade reinforced concrete pipes and tanks, bricks with cemented mortar, vitrified clay pipes, polyvinyl chloride pipes and other normally durable parts.
For instance, most wastewater contains hydrogen sulfide, which turns into sulfuric acid, a corrosive substance that not only affects metals, but also concrete surfaces. Scientists also discovered that hydrogen sulfide is converted into sulfuric acid by the microbes found in wastewater.
Over the decades since the implementation of sewerage systems, a wide range of internal and external protective coatings have been developed for new sewer systems as well as for the maintenance or rehabilitation of existing ones.
In choosing the appropriate sewer coating, it is very important to consider the underground conditions (corrosive soil, underground temperature, etc.) that the system will be exposed to. The installation method and design are also important considerations in choosing sewer coating. For example, bent pipes require coating that has the flexibility to resist cracking or peeling off in the bent locations.