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NCPI Toolbox

The NCPI Toolbox is a set of four programs that can assist in the design of gravity flow sewers using Vitrified Clay Pipe.  The programs will calculate flow, safety factor, cost of bedding and lifecycle cost impact.

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Request Materials

The National Clay Pipe Institute makes a number of materials available for those who desire more detailed information on the design, installation and uses of VCP.  Take a look at the list of resources currently available from NCPI.

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NCPI Hydraulic Calculator

The NCPI Gravity Flow Hydraulic Calculator may be used to solve the various parameters of Manning's Open Channel Flow Equation.  This wheel calculator is an effective tool for sizing pipe, determining flow rates and velocities, and depth of flow.

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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
-  Challenging Soils 
-  Forensic Engineering
-  Asset Management/ Lifecycle Analysis

-   Shear Load Calculations
-   CLSM as Bedding Material
-   Designs for Deep Installations

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.


Today, Vitrified Clay Pipe is the most sustainable sewer pipe product available.  With the longest service life, environmentally friendly natural materials and regional production facilities, clay pipe is enjoying renewed interest among civil engineers employing a formal asset management approach to design and in municipalities that have an environmentally preferable purchasing policy and a desire to incorporate sustainable practices.



PHOTO: 2,500 years and counting - This 2,500 year old pipe was reused for site drainage and is still in service today!

 Vitrified Clay Pipe for gravity sewer systems has been in use for 2,500 years and counting

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.

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Sustainability and Vitrified Clay Pipe

Clay pipe is the most environmentally friendly material that can be used in the construction of a sewer system.green_logo.jpg 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.

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Four videos produced by NCPI to provide more information on various aspects of VCP for use in gravity sewer systems.

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