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Welcome to National Clay Pipe Institute
The National Clay Pipe Institute (NCPI) is a non-profit technical resource for design, installation and operation of vitrified clay pipe (VCP) gravity sewer systems. Established in 1944, NCPI is the authoritative resource for civil engineers and contractors designing, specifying and installing VCP sanitary sewer systems.
The Engineering Manual and all the elements of the NCPI Toolbox are just the beginning. As the technical representative of clay pipe manufacturers around the country, NCPI offers design assistance, training and consultation to civil engineers in the following areas:
- Bedding Systems | - Shear Load Calculations |
To request a no-charge consultation or to find out more about what assistance we might be able to provide, please contact us at 262/248-9094.
Clay has been used as a sewer pipe material for the last 4,000 years. The clay pipe industry was one of the earliest industries to work with ASTM and was instrumental in establishing production and installation standards more than 100-years ago. This rich history provides an unmatched level of experience that we bring to today's new challenges.
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NCPI Library
The National Clay Pipe Institute has been actively involved in research and testing of Vitrified Clay Pipe for gravity sewer systems for many years. During that time there has been a considerable amount written about the performance characteristics and installation methods available for use when considering VCP. Many of these resources are available in our Library.
Sustainability and Vitrified Clay Pipe
Clay pipe is the most environmentally friendly material that can be used in the construction of a sewer system. |
Four videos produced by NCPI to provide more information on various aspects of VCP for use in gravity sewer systems.

The long life, durability and excellent chemical resistance make it the best material for the construction of such a vital component of a municipality's infrastructure. When Sustainability is a consideration in the choice of materials, Clay will always come out on top.