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Accumulation of slime in drainage pipes & their effect on flow rsistance

The effects of slime layer development on hydraulic roughness of various types of pipe materials. Tests done with clean pipe & clean water. This test also looked at slime build up on several types o...

An Economic Approach to Sewer Pipe Selection - ASCE Paper

This is a lifecycle cost discussion based on least cost analysis program found in the Toolbox program.

An Economic Approach to Sewer Pipe Selection - NCPI Brochure

This is a lifecycle cost discussion based on the least cost analysis program found in the Toolbox program.

CDF - A New Bedding System for Clay Pipe

NCPI, in cooperation with Pacific Clay Products and Mission Clay Products installed two field test lines to measure the bedding factor and installation procedure when Controlled Density Fill (CDF) mat...

Clay Pipe Installation - Advances in Load Factors

An evaluation of load factor values for classes B, C and D bedding systems and discussion of the development of a new system with higher load factors. Using strain gauges, the stresses on loaded pipe...

Designing Vitrified Clay Pipe Systems with EASE

This program discusses the development of the trench load program going back to Marston's development of the trench load equation and how it was adapted into a computer based design system for use by ...

Ductile Iron Corrosion Factors to Consider and Why

This paper discusses various corrosion considerations and controversies surrounding ductile iron pipe. Factors that should be considered during corrosion evaluations and pipeline designs are summariz...

Dude, Where's My Pipe? - Accelerated Corrosion Rate Threatens Phoenix Sewers

Discussion of Corrosion in the Phoenix system. Discusses invention and causes of the corrosion and the cost of repairs.

Durability of Clay Pipe

Vitrified Clay Pipe is unique in its corrosion and abrasion resistant qualities. It is manufactured from clays and shale's, the earthy mineral aggregates which the end products are yielded by the wea...

Energy Audit of Vitrified Clay Pipe Fabrication

This report summarizes results obtained during an investigation conducted by ITT Research Institute, under Project D8143, for the National Clay Pipe Institure (NCPI). Work on the program began in Jan...

Evaluating Ductile Iron Pipe Construction

The majority of ductile iron pipelines have only been in operation for 25 years or less. Failures of ductile iron piping have become more prevalent as the pipelines have gotten older. Experience has...

Excerpts From National Cooperative Highway Research Program Report Plastic Pipe For Subsurface Drainage of Transportation Facilities

This report focuses on the suitability of various plastic pipe systems for the drainage of highway and other transportation facilities. The authors relied on available information and experiences with...

Hydrogen Sulfide Corrosion in Wastewater Collection and Treatment Systems

A report to congress on the effects of hydrogen sulfide on sewers.

Load-Bearing Characteristics of Bedding Materials for Sewer Pipe

National Clay Pipe Institute Research Laboratory began field studies to determine the effects of loads imposed on pipelines during backfilling and whether these loads either increase or decrease as a ...

Manning's Coefficient Calculated From Test Data

In general, the information on n values seems to indicate that the choice of a value should be such as to provide some margin of safety in design. The uncertainty of the values for n incommon use has ...

Microtunneling Forces: The Pipe's Perspective

This paper reports a statistical method for calculating the maximum axial force required in microtunneling. Other forces put on the pipe when steered are discussed. A theoretical method is given for...

Tests on Slimed Sewers

This test evaluates slime layer developement using various pipe materials in actual sewage flow conditions. Test showed that clay and PVC showed similar slime layer developement.

The Evolution of Jointing Vitrified Clay Pipe

Brief review of changes in the water treatment industry and how the clay pipe industry has changed its product to meet the changing attitudes. Chronicles the development of today's compression joint.

The Problem of Hydrogen Sulphide in Sewers

The definative study by Dr. Richard Pomeroy, Ph. D. on the development and effects of hydrogen sulphide in sewer systems.

Using Historical Repair Data to Create Customized Predictive Failure Curves for Sewer Pipe Risk Modeling

SPU commissioned a study to develop customized failure curves based on recent experiential sewer pipe failure data. These new curves would be created using actual historical pipe repair information a...