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Home » Authors » David Dexter
David Dexter

David Dexter

David D. Dexter, P.E., F.NSPE, F.ASPE, CPD, is a registered professional engineer, certified plumbing inspector and plans examiner and master plumber. He has more than 40 years of experience in the installation and design of plumbing systems, specializing in plumbing, fire protection and HVAC design as well as forensics related to mechanical system failures. Dexter also chairs ASPE’s Main Design Standards Committee and the ASPE Bylaws Committee.

Articles

ARTICLES

PME 0823 CLMN David Dexter
Plumbing Talking Points | David Dexter

Obligations to the engineering profession

Volunteering offers numerous benefits for professional growth at all stages of one’s career.
David Dexter
David Dexter
August 7, 2023

Regardless of our position in an organization or profession, we all have obligations and responsibilities to the career that we have chosen.


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water steam

David Dexter: Circulation in plumbing system design

Entrapped air can be a problem in domestic water systems.
David Dexter
David Dexter
June 5, 2023

Mechanical engineering is an integral part of both HVACR (Heating, Ventilating, Air-Conditioning and Refrigeration) and plumbing. While both disciplines utilize the same science and engineering principles, their application diverges depending on the system under consideration. A prime example of this is the “wet” piping system that moves water through the piping network.


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uniform flow

David Dexter: Fitting Selection and proper flow

The importance of maintaining uniform flow with minimal disturbance to the flow patterns.
David Dexter
David Dexter
April 5, 2023

Codes and standards are intended to provide a minimum level of protection for the public’s health, safety and welfare. And, generally, these documents accomplish that intended purpose in the urban/metropolitan areas of the United States. However, that may not be accurate when one gets into the rural or more isolated areas of the country.


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Manacapuru, Brazil, community water tower collects and distributes rainwater.

David Dexter: Plumbing systems around the world

While the general principles of plumbing codes appear to be followed in different countries, it seems they are very loosely interpreted.
David Dexter
David Dexter
February 6, 2023

Codes and standards are intended to provide a minimum level of protection of the public’s health, safety and welfare. And, generally, these documents accomplish that intended purpose in the urban/metropolitan areas of the United States. However, that may not be accurate when one gets into the rural or more isolated areas of the country.


Read More
A plumbing professional engineer’s view

David Dexter: The ANSI process versus governmental process

A plumbing professional engineer’s view.
David Dexter
David Dexter
December 7, 2022

“Governmental members” may desire a public perception of having “no vested financial interest in” the development process. But there is no requirement or mandate for them to be transparent in avoiding conflicts of interest.


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structural consultant

David Dexter: Who designs the perimeter and foundation drainage system?

Questions asked and answered on ASPE’s Open Forum.
David Dexter
David Dexter
October 6, 2022

Recently, the question was asked on ASPE’s Open Forum “Foundation drain pipe — plumbing responsible? Or only between civil and structural?” As originally posted, the designer did not have a Geotech report. But the structural consultant did show the piping around the top of the elevator footing and the perimeter footing for the foundation in their details.


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merits of regulations

Devid Dexter: The merits of regulations

Don’t throw out the baby with the bath water.
David Dexter
David Dexter
August 5, 2022

Regulations have been a big topic over the past several years. Politicians, trying to make a public name, have been pushing for the reduction of regulations. They like to claim that these regulations are an impediment to economic growth and entry into certain professions. While some of this may have merit, one needs to “not throw out the baby with the bath water.”  


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Running horizontal drains
Plumbing Talking Points

David Dexter: Running horizontal drains

A discussion on the minimum burial depth or pipe cover required.
David Dexter
David Dexter
June 8, 2022

Let us get down in the dirt, or at least “backfill.” A recent discussion on ASPE Connect’s “Open Forum” was entitled “Minimum Pipe Cover when Calculating Invert Under Building Slab for PVC Sanitary.”


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Digging deeper into thermal expansion
Plumbing Talking Points

David Dexter: Digging deeper into thermal expansion

Frequent failures occur at joints or fittings.
David Dexter
David Dexter
April 7, 2022

Recently, I wrote about plumbing pipe thermal expansion and expansion fittings. Based upon feedback from some in the design community, there seems to be a feeling that more design professionals within the consulting industry need to have a better foundation to enhance their understanding of the topic.  


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Plumbing Pipe Thermal Expansion and Expansion Fitting
Plumbing Talking Points

David Dexter: Understanding thermal expansion and expansion fittings

Material selection can create or prevent many expansion and contraction problems.
David Dexter
David Dexter
February 8, 2022

Recently, there was a discussion on the ASPE Open Forum regarding, “Plumbing Pipe Thermal Expansion and Expansion Fitting.” Generally, this topic would be found within your specifications under Section 22 05 16, “Expansion Fittings and Loops for Plumbing Piping;” this topic is under-discussed, and in many cases, poorly understood by many designers and engineers.


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