Archive All-Stars!

The fire protection industry continues to grow and evolve every day. Engineers, designers and local authorities are confronted with new challenges that involve unique applications...more...

Pumping systems are contributing significantly to the success of this trend through the use of alternative applications including variable frequency drives, water heaters with minimal...more...

A thermostatic mixing valve tempers hot water down to a lower temperature by:

a. Passing through a chilled water heat exchanger
b. Isentropic expansion
...more...

I can always tell from the questions I get from our guys in the field when there is an issue that is poorly understood and...more...

In the May 2011 issue of this magazine, I wrote a column titled, “Is PVC an acceptable vent material for flue gases?” in which I...more...

I recently inspected the mechanical systems in student housing at a Midwest university. The school had hundreds of apartments in numerous buildings with high efficiency...more...

Plumbing design professionals and contractors are faced with many challenges when designing, installing or maintaining domestic hot water systems. Two of the more important challenges...more...

Every year, thousands of people suffer serious thermal shock and/or scalding injuries in showers or combination tub/shower fixtures. Tens of millions of currently installed code...more...

Modcon boilers are getting mighty efficient these days. Where does the efficiency come from? Boiler manufacturers are gaining this extra efficiency by extracting heat from...more...

Washington, D.C., is not exactly the Arctic Circle, but we have installed a surprising number of snowmelt systems over the years, everything from walkways and...more...

The air and dirt found in today’s piping systems have not changed all that much over the years. What has changed, or evolved, are the...more...

Water has the unfortunate quality of being heavier than air. In fact, it weighs 62.4 pounds per cubic foot. This mass requires a pressure of...more...

When starting a fire pump design, the most important item to consider is the water supply. If you are utilizing the city water supply as...more...

When designing sanitary or storm drainage systems, it is important for the design professional to think about how the drainage system will be maintained. For...more...

The first rule of plumbing is “sewage flows downhill.” When sewage is not following the rules, you’re going to need a backwater valve. These little...more...

I am often asked, “What is a safe hot water temperature for domestic hot water?” If you read the model codes, it states the maximum...more...