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Clay - The Permanent Solution

Information Center


In over 70-years of research and publication, NCPI has amassed an extensive library. The papers and articles available here include our most referenced materials.  If you don’t see what you’re looking for, please follow the links at the bottom of the page to see a more extensive listing of materials or use the search tool at the top of the page.

Technical & White Papers

News & Articles

A brochure for tips on laying VCP with English and Spanish translations.

Procedures and Tables Based on ASTM C828: Standard Test Method for Low-Pressure Air Test of Vitrified Clay Pipe Lines

Presented at ASCE Pipelines, 2014

Testing on bedding practices that don’t include haunching reveal voids and call the assumption of uniform haunch support into question.


Presented at ASCE Pipelines, 2013

CLSM as a structural bedding material for VCP.

Optimal mixes, methodologies and resultant safety factors are discussed.


A Guide to Analyzing Televised Inspection


See all Technical Papers...


from Midwest Journal of Trenchless Technology, 2016

120 year old clay pipe proves VCP durability.

from Trenchless Technology, 2016

Only VCP can document more than 200-years of service in the U.S.  “It is unwise to pay too much, but it worse to pay too little.”

from Water Finance & Management, August, 2016

from Municipal Sewer & Water, August, 2014

from Water Utility Infrastructure Management, December, 2014


See all News Articles...


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