Definition - What does Corrosion Prevention mean?
Corrosion prevention is an essential part of pipeline maintenance. Sewer pipes are prone to corrosion because of the production of corrosive gasses, such as hydrogen sulfide, from wastewater.
Sliplining, cured-in-place pipe (CIPP), pipe bursting, fold and form pipe etc are some trenchless rehabilitation methods that can be used to repair pipes damaged by corrosion. Pipe materials such as high-density polyethylene (HDPE), polyethylene (PE) and polyvinyl chloride (PVC) are excellent for replacing old pipelines because they are resistant to abrasion and corrosion.
Trenchlesspedia explains Corrosion Prevention
Corrosion and odor in the sewer system are usually caused by the release of sulfide compounds mainly hydrogen sulfide, produced in the wastewater. Hydrogen sulfide, when oxidized to sulfuric acid, is capable of causing extensive corrosion and damage to pipelines especially of pipe materials and fittings made of iron, zinc, copper, lead etc. Corrosion prevention can be achieved by inhibiting the formation of sulfides, and inhibiting production of hydrogen sulfide and sulfide acid.
To inhibit corrosion anaerobiosis should be prevented by injecting air, disturbances in flow should be minimized, and sulfide should be immobilized and bacterial activity inhibited by adding appropriate chemicals. Other methods for corrosion prevention include minimizing stripping of hydrogen sulfide gas by turbulence, using inert pipe materials and use of liners for protecting concrete surfaces.