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Applying Variable Volume Pumping - Part II
To optimize system performance, the designer has a number of variations of basic primary-secondary pumping to explore:Pumping FundamentalsIn the previous article “Variable Volume Pumping Fundamentals,”...
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Steam Control and Condensate Drainage for Heat Exchangers
Steam Systems General Heat transfer units that use steam to produce hot water are known as indirect heaters. They are often shell and tube type heat exchangers and are generally referred to as...
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Troubleshoot Pumps Using Pump Curves and Gauge Readings
Maintenance TipsA manufacturer’s pump performance curves contain data that can help hvac technicians analyze a pumping installation. Pump curves also help identify the system’s operating point, find...
View ArticleBell & Gossett System Syzer Wins Top Software Award
ITT Bell & Gossett's electronic System Syzer has just been named as one of the top 10 products and the number one software program for 1995 by Consulting Specifying Engineer Magazine in its Annual...
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ITT Bell & Gossett Adds New ThermoMate Control Operators
ITT Bell & Gossett announces the addition of new, re-designed, non-electrical thermostatic operators to its popular line of ThermoMate Thermostatic Control Valves.ThermoMate Thermostatic Control...
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The Mystery of Cooling Tower Pump Noise
The problem of "cavitating condenser water pumps" with adequate NPSH available is not uncommon. We discussed this phenomenon with cooling tower manufacturers and other centrifugal pump...
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Helpful Tips for Complaying with the National Energy Building Code
In this article, we will discuss two aspects of the National Energy Building Code relating to hydronics: variable flow in pumping systems and system balancing (minimizing throttling losses and trimming...
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Troubleshooting Steam Heat Exchangers and Their Systems - Part 2
When a heat exchanger "stalls," condensate floods the steam space and causes a variety of problems within the exchanger: Control hunting: As condensate backs up in the exchanger, the heat transfer...
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EPAct '92 and Motors - How It Will Affect You
What single product is sold more often than any other product in the world today? Believe it or not, electric motors. No wonder, then, that many people are asking what the impact will be to electric...
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How to Size and Select the Correct Centrifugal Pump
At one time or another we have all heard the same question: How do I know that the pump I just selected is the right one for the application? Ever since the advent of the Massachusetts Pump, first...
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What's New For October 1997
New Maintenance-free CirculatorSuperior Alternative to Large Wet RotorsITT Bell & Gossett has introduced a new family of maintenance-free, in-line circulators, called the Series PL®, that provides...
View ArticleUpdate of EPAct '92
The Energy Policy Act of 1992 requires the state regulation of new building construction through building codes and standards. Specifically, EPAct ‘92 refers to BSR/ASHRAE/IENSA Standard 90.1989...
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New Products at ASHRAE
New Technologically Advanced Liquid Level ControlAt ASHRAE ‘98, McDonnell & Miller showcased a technologically advanced, inexpensive general purpose liquid level control designed to meet a vast...
View ArticleOnline Tools are In-Line with Engineers
Since going on-line in January 1997, Fluid Handling’s Web Page has been an excellent resource for answers to questions from consulting/specifying engineers. The most popular on-line tools are the...
View ArticleSteam Pressure and Product Selection for Heat Transfer Systems
Choosing the operating pressure for a heat exchanger system is an important design decision. The choice of pressure will impact the selection of the heat exchanger and the steam trap for your...
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The Ins and Outs of Boiler Bypass Lines
Boiler manufacturers are emphasizing bypass lines nowadays and with good reason. Today’s boilers are relatively small, and their heat exchangers are much more efficient than the boilers of yesteryear....
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The Compression Tank's Vital Role in Hydronic Systems
Compression tanks are essential to the operation of any closed, pressurized, hydronic heating or chilled water system. They perform four important functions:1. The gas cushion in the tank absorbs the...
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Converting the HBF into a Condensate Unit
Q I have an application to replace a condensate unit that has a 55-gallon steel receiver with two pumps rated at 60 GPM at 20 psig. The space constraint requires a long narrow unit, under 30" in width....
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The Changing Role of the Plant Engineer
"Trying to do too much with too little resources" and "Training of the workforce" are the two major concerns facing North American plant engineers, according to a recent industry study. Cahners...
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Good Piping Practice Prevents Water Hammer in Steam Systems
One of the most common complaints against steam heat is that a system sometimes develops a hammer-like noise commonly referred to as water hammer. It can be very annoying. However, it may indicate a...
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