Treatment Types
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| National Corrugated Steel Pipe Association 2008 |
Galvanized Steel Pipe Pre-galvanizing is the most widely used and most economical metallic coating for corrugated steel pipe and it protects and extends service life. In addition to forming a physical barrier against corrosion, the zinc coating sacrifices itself slowly by galvanic action to protect the base steel. This action continues as long as any zinc remains. The design life of galvanized pipe - installed in a corrosive environment - can be extended by coating the pipe with asphalt
Aluminized (Type 2) Steel Pipe Corrugated pipe is fabricated from steel that has been hot-dipped in commercially pure aluminum. Over 50 years of field-testing confirm that Aluminized Steel Type 2 (ALT2) corrugated steel pipe offers 75 years or more of maintenance free service life in the environmental ranges of pH 5-9 with resistivities as low as 1,500 ohm-cm.
Polymer Coated Pipe Corrugated steel pipe (CSP) with heavy-gage polymer coating offers long-term protection for storm drains and culverts. Even under harsh conditions, polymer coated CSP protects against abrasion and corrosion to provide at least 100 years of service life. This tough film, bonded to both the inside and outside of galvanized Corrugated Steel Pipe, serves as a protective barrier - resisting corrosion from acids, salts and alkalis found in today’s storm sewers and culverts.
Bituminous Coated Pipe Asphalt coating increases the durability of corrugated steel pipe for prolonged design life and can also be used to improve hydraulics.
Descriptions courtesy of Contech Engineered Solutions
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Powell County, MT dam CMP in 1999, no holes, pipe in relatively good shape
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Powell County, MT Dam in 2014, following piping failure along side outlet
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Powell County, MT Dam in 2014, following piping failure along side outlet
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Powell County, MT Dam in 2014, following piping failure along side outlet
Revision ID: 1162
Revision Date: 06/21/2022