Technical Blog

Welcome to John’s Blog. Answers to frequently asked questions are periodically posted here. The objective is to share information about PVC pipe with readers as well as with utilities, design engineers and pipe installers. The blog provides the latest information on PVC pipe design, installation, and application for water and wastewater infrastructure projects.

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John Houle: Senior Technical Consultant, PVC Pipe Industry

John Houle holds a Master’s Degree in Civil Engineering from the University of Missouri and an MBA from the University of Oregon. He has more than 25 years of experience in the plastic pipe industry in applications engineering, market development, forensic analysis, technical writing, and standards development.

Manning's "n" for PVC Gravity Sewer Pipe

Mar 3, 2020  John Houle

“Conservative” design is taught continually to all engineers during college and throughout their employment. I think we can all agree that this is a good idea – we don’t want engineers to cut corners and cause potential problems.

Air Valves: A Cost-Effective Way to Enhance Pressure-Pipe Performance

Dec 16, 2019  John Houle

The presence of air in a pressure pipeline is unavoidable, since dissolved air is present in the fluid being transported. This entrained air comes out of the fluid during certain operating conditions and gathers in pockets at high spots in the pipeline.

Joint Restraint Options for PVC Pressure Pipe

Dec 4, 2019  John Houle

Internal pressure causes longitudinal thrust forces in pipe systems. These forces are developed at changes in flow direction or pipe size, as well as at dead ends. To keep pipe joints from pulling apart, either joint restraint or concrete thrust blocking is required.

An Engineering Primer on AWWA C900/C905 PVC Pipe

Oct 21, 2019  John Houle

Engineers who are unfamiliar with PVC pressure pipe sometimes have a list of questions about the product. These questions, which often arise from misinformation propagated by competitive materials, usually have logical answers based on engineering principles.

Dimension Ratio (DR) Explained for PVC Pipe

Apr 8, 2019  John Houle

The PVC pipe industry sometimes makes use of technical abbreviations that may not be fully understood by utility and consulting engineers. “DR” is a case in point.

Organotin (Tin) Stabilizers: Not a Health Concern for PVC Pipe

Mar 25, 2019  John Houle

PVC pipe’s organotin stabilizers — not a health concern.

A Comparison of PVC and Ductile Iron (DI) Piping for Water Mains

Sep 17, 2018  John Houle

During 70 years of sustained growth for PVC water pipe, iron pipe’s market share has decreased dramatically. The iron industry has reacted by negative attacks and by spreading misinformation about PVC pipe. We thought it was time to provide a more-balanced view.

Guide: Field-Cutting of PVC Pipe

May 2, 2018  John Houle

PVC Pipe Association's guide for safe and effective field-cutting of PVC pipe.

Proper Installation of PVC Piping

Apr 3, 2018  John Houle

Installation practices for underground infrastructure can play an important role in the performance of pipe networks.

Technical Paper: Evaluating Life Cycle Assessments for Underground Infrastructure

Feb 21, 2018  John Houle

Sustainable Solutions Corporation (SSC) paper on the importance of using transparent and verifiable standards when determining the environmental impacts of a pipe product. No other pipe material has disclosed environmental impacts to as transparent and regulated a degree as the PVC pipe industry.