As the consensus process settles in for the International Association of Plumbing and Mechanical Officials (IAPMO), major changes continue to appear in the Uniform Plumbing Code (UPC). One could not help but be amazed by the quality of the technical discussions on each proposed code change.

Variable-speed injection has been used in North American hydronic systems for well over a decade.  Two important details are crucial to proper operation... 

The columnist addresses inquiries ranging from the adoption of energy codes by building codes, to valve supervision requirements, to specifics about NFPA 13.

The International Association of Plumbing and Mechanical Officials (IAPMO) has just released the proposed code changes to the Uniform Plumbing Code (UPC), which will result in the culmination of the 2009 UPC. In reviewing the changes, there appear to be two distinct approaches taken by the proponents.

Our industry has used primary/secondary piping systems for years. Most engineers currently designing hydronic systems are familiar with how these systems operate, as well as how they are designed. Still, based on discussions I’ve had, it’s evident that questions remain, particularly on this issue of flow reversal when secondary circuit flow rate exceeds primary loop flow rate.

Inquiring PM Engineer readers want to know…many things.

Many believe that the major decisions regarding the codes have all occurred. To them, time has passed and it is no longer important to participate in code change hearings. Well, that is not true. Next month, in Rochester, NY, perhaps the most important decision in the history of codes will occur. That decision is whether to mandate residential sprinklers for all one- and two-family dwellings.

For years, the gravity tank has graced urban skylines, housing water and harnessing an energy known as simple gravity. Prior to the proliferation of fire pumps, the wooden rooftop water tanks were long considered the first line of defense against high-rise building fires. They ensured both an adequate quantity of water and adequate pressure.

The first meeting of the IAPMO Plumbing Technical Committee and Mechanical Technical Committee will take place the week of April 23, 2007, in St. Louis, MO-the first meeting that the changes to the 2009 Uniform Codes will be discussed. Equally important, the ASPE Legislative Committee proposed a series of code changes that would dovetail into the code changes proposed by the DWV task group.

Every year around this time, the temperatures begin to increase. Simultaneously, the important events of the plumbing engineering industry tend to do the same.