CPP offers a variety of non-pressure, gravity flow leak resistant couplers that should be considered for use in chemically active fluid transportation pipe systems. Leak resistant couplers are also a must consideration in farm pond/stormwater retention pipe systems that are generally embedded at non-cohesive soil sites. CPP Corrosion Resistant pipes are also used in landfill leachate treatment pipe systems because landfill leachate flow strengths change radically and frequently across the pH scale.

CPP’S Dual and Single Wall pipes are used in surface and subsurface, natural or built-up wetlands, and sand-pebble filters for low cost small community wastewater treatment systems.

Corrosive wastewater and industrial treatment pipe systems can look forward to a longer life with CPP's HDPE Single Wall corrugated or CPP's Dual Wall Smooth Core/n-10 corrugated pipes. Used since 1968 in home septic systems, CPP pipes have demonstrated strong resistance to corrosive wastewater environments, and is unaffected by pH ranges from 1.5 to 14. Concentrated corrosive sewage consisting of caustic lyes, household detergents, brighteners and bacterial elements make CPP's HDPE chemically inert pipes desirable for use in sewer plant filtration treatment, bed pebble-sand filter, oxidation ditch pipes and flush lines. Animal wastewater treatment systems such as swine houses and dairy facilities also prefer the use of CPP's inert HDPE plastic pipes as well as landfill leachate treatment pipe systems; the flow strengths of both change radically and often across the pH scale.

Wastewater lagoon discharge line.

Water Leak Resistant, Gravity Drain Couplers.

Mastic Wrap Couplers	Shear Gasket Gravity Flow Water Leak Resistant Couplers 4” to 8”

While some of the more tightly controlled manufactured concrete pipes may show an initial roughness coefficient equal to an HDPE pipe when first installed, the durability of HDPE over a period helps preserve its roughness coefficient despite wear since the chemically inert HDPE is less effected by pitting and corrosion. This in turn reduces maintenance and replacement costs over the years. Because the "n" factor remains more constant over the years compared to the "n" factor of competing pipe raw materials, Downsizing with CPP's Smooth Core on flat grades is possible. Using smaller size CPP pipes at steeper grades to achieve higher flow rates is also possible because HDPE raw material based pipes are more abrasion resistant than competing raw material based pipes.

Chemical Resistance

HDPE is the most chemically inert of all plastics, thus making CPP’S corrugated pipe systems corrosion resistant. According to Modern Plastics Encyclopedia Magazine’s chemical resistance charts for HDPE molding and extrusion grade plastics, HDPE has good resistance to a number of chemically active solutions including the following:

Acetic Acid	Chlorine
Allyl Alcohol	Nitric Acid
Phosphoric Acid	Sulfuric Acid
Sodium Chloride	Strong Alkalies
Hydrochloric Acid