Tech Notes
These documents are single page technical briefs based on common questions received by the clay pipe industry. For more detailed information, Contact NCPI's Technical Representatives.Abrasion Resistance of Sewer Pipe Materials - TN17
The abrasion resistance of several commonly used sewer pipe materials.
American Society for Testing and Materials Standards Development - TN20
The process involved in the development of an ASTM Standard.
Bedding Design for Clay Pipe - TN19
This Tech Note discusses the different bedding system's available for use when installing clay pipe. It also discusses load factors and proper installation techniques.
Bell or Coupling Holes and Shovel Slicing - TN15A
The digging of bell or coupling holes and shovel slicing of the initial bedding in haunch areas of the pipe are two critical functions that need to be part of any successful sewer pipe installation. ...
Curvilinear Sewers - TN12
New factory applied joints provide angular deflection enabling installation of curved sewers.
Deflection: Does it Matter? TN06
This edition of TECH NOTES, considers two aspects of flexible pipe deflection: Structural Design and Hydraulic Performance.
Infiltration and Inflow Studies - What do they really show? - TN05
Early clay pipe lines were often designed to allow infiltration and inflow not only to dilute sewage, but to aid in its flow downstream.
Is Less Really Less - An Economic Approach to Sewer Pipe Selection - TN04
When comparing alternate bids of pipe with different life expectancies, the lowest initial bid is not always the best bid or in the best interest of the owner. The goal is to select the pipe material...
Knowing Your Limitations - TN14
Television has been growing in popularity as a means of investigating the condition of all types of buried sewer lines. As an investigative tool, the latest equipment is unmatched in enabling operato...
Microtunneling with Clay Pipe - TN22
Microtunneling is a precise method of installing pipelines without digging trenches or dewatering. Pipe are jacked through the ground from a launch shaft to a reception shaft by the use of a laser gu...
Modern Clay Pipe Joints: No Longer A Case of Leaks and Root Intrusion - TN21
Discuss of history of joint development and a look at today's joint performance. Quote from Winston Salem, North Carolina about no root intrusion.
NCPI Modifies a slurry bedding system - TN13
A new bedding system known as CONTROLLED DENSITY FILL (CDF)is introduced by NCPI. CDF, considered to be slurry, was specified to have a compressive strength of 100 psi to 300 psi at 28 days. Desired a...
NCPI Tool Box - TN03
NCPI "Toolbox" is a disk containing four NCPI developed computer programs to aid design engineers.
NCPI/NYC Research Project - TN25
NCPI/NYC Research Project - An Evaluation of Four Bedding Systems. The City of New York places a high priority on achieving the longest life cycle possible for all sewer installations while reducing ...
Restoration of Vitrified Clay Pipe Lines - TN16
BACKGROUND - It has been estimated that over the last 125 years more than a million miles of clay pipe sewers have been installed in the United States. Most of this pipe is still in service. Contract...
Sand as a bedding material - TN11
Sand has been used as a bedding material in parts of the country for many years and has been presumed to be the ideal bedding material. The limitations of sand bedding are presented.
Single Material Specifications - TN23
A discussion of relevant laws and regulations discussing sourcing for public contracts.
Surcharge Fills - TN24
There is often considerable uncertainty about the ability of an existing sewer to support additional backfill placed over the top of the original trench. The following suggestions may be useful to th...
The Decision is Yours - TN10
Selecting a particular sewer pipe material may affect the lives and pocketbooks of the people in your community for the next 100 years or more.
Vitrified Clay Pipe - A Pipeline of Progress - TN09
A historical time-line of national events paralleling the development of the Clay Pipe Industry.
Vitrified Clay Pipe - The Choice for Difficult Solutions - TN08
When clay pipe is vitrified, the clay mineral particles become fused into an inert, chemically stable compound, integrally bonded by its very nature, independent of any artificial bonding agent.
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