There is a battle going on in the industry when it comes to domestic water distribution systems, and it lies in how plumbing engineers size domestic water piping. System longevity, pressure drop, water age, noise and building codes will influence the approach taken in sizing a domestic water system.

In 2012, the International Association of Plumbing and Mechanical Officials (IAPMO), the University of Cincinnati (U of C), and the American Society of Plumbing Engineers (ASPE) began to work on a new sizing technique 80 years in the making. The main drivers were Dan Cole (IAPMO) and Steve Buchberger (U of C), and later Toju Omaghomi (U of C). As part of this effort, hundreds of thousands of data points were taken and evaluated to determine actual human behavior and plumbing fixture use in residential homes.

Common sense runs through our veins and helps us avoid idiotic, absurd edicts handed down by well-intentioned, but seriously misguided politicians. The fact is, I’ve always felt that common sense, along with training and knowledge, often handed down from generation to generation, guides our hands and minds as we toil at PHVAC issues.

One of the best things about hydronic heating systems is that it’s easy to integrate some method of domestic water heating. This combination has been used for decades in systems where a boiler was the sole heat source. It’s also possible when a heat pump serves as the heat source.

Dr. Saum Nour (Khosrow Nourmohammadi), PE, Ph.D., CPD, LEED AP, CFPE, AIA Allied, is a very well-educated man. Just a quick glance at all the acronyms after his name may have some people feeling a bit intimidated. His deep knowledge of the industry, constant pursuit of education and willingness to help others learn has nabbed him the award for PM Engineer’s 2022 Plumbing Engineer of the Year.

A little-known fact about solar electric panels is that the hotter the panel itself, the less efficient it becomes. Studies have found a 0.05% efficiency loss for every degree of temperature that is increased. The reverse is true in that efficiency increases by 0.05% for every degree temperature decreases.

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.

It hasn’t taken long for some of the most obvious unintended consequences to appear: More people are complaining that their shower experience is deteriorating due to lower flow rates, and shower times are increasing as people have to shower longer to wash the shampoo out of their hair.

There has been a lot of discussion and new guidance documentation about Legionella in building water systems and the implementation of water management programs (WMP) for ongoing operations. This has led to discussions about plumbing engineering best practices to allow the building water distribution system (BWDS) to operate efficiently and safely when the building is occupied.

In creating Hunter’s Curve, the beauty of what Dr. Roy Hunter did was to take an incredibly complex problem in probability theory and make it simple — so simple, in fact, that all it required was basic arithmetic.