This issue’s lineup covers a range of equipment, all designed to bring you new information, something of which you may not be aware. Topics include a new use for liquid nitrogen, a look at how one company maintained temperature during an entire brewing process, or how monitoring instrumentation needs to be selected. We’re covering those topics on these pages as well as others. Our editors hope you expand your knowledge base with our articles, and if they raise questions for which you’d like to see a ”Part 2” followup, please tell me. Just zap me an e-mail -- my address is below my signature at the end of this commentary.

The use of ammonia as a refrigerant has increased substantially over the past several years as a replacement for environmentally unfriendly chlorofluorocarbon refrigerants. However, ammonia is a toxic gas, and proper safety monitoring procedures and equipment must be in place at all times to avoid serious accidental injury or death. In the United States, the use of monitoring instrumentation for early warning of releases of highly hazardous chemicals such as ammonia is required, but it is up to each plant to choose the type of instrumentation. Here’s some help with that choice. Robert E. Henderson, president of GfG Instrumentation Inc., in Ann Arbor, Mich., gives you direction in “Sensor Evaluations.”

Our own contributing editor Kristi Grahl explores the newest twist with LN2- harnessing it in a portable device for delivery at ultra-high pressures. “The Cleaning Power of LN2” describes how this versatile substance can be used to provide a fast, effective and environmentally friendly way to clean tubular heat exchangers.

Beer-making requires precise temperature control to maintain a cool product. “Keeping Beer Cool from Brewery to Tap” drives home the importance of the phrase “keeping cool” to Bell’s Brewery of Kalamazoo, Mich. The craft brewer uses inhibited glycol heat transfer fluid for its temperature-sensitive operations, according to Nicole Gorsuch, North American marketing manager for low-temperature thermal fluids at Dow Chemical Co., Midland, Mich.

External corrosion, dents, bulges and punctures provide visual indicators of potential sites for failures in refrigerant vessels and piping constructed of carbon steel. In “Pinpointing Piping Problems,” you’ll learn from research engineer Daniel Dettmers of the Industrial Refrigeration Consortium, a collaborative effort between the University of Wisconsin-Madison, Madison, Wis., and members of the refrigeration industry. In piping, weakened areas can become the source of excessive maintenance or downtime. This article looks at implementing a regular inspection program to help plants identify and correct piping problems before they affect production.

Successful cooling tower water treatment seeks to mitigate both organic and inorganic circulation through biological remediation and settling of inorganic particulates, while also controlling the pH of the water. One of the most practical and efficient methods is to inject biological control chemicals using a controlled-volume diaphragm metering pump, as described in “Precise Chemical Injection” by Thomas J. Day, Ph.D., product manager at Milton Roy Americas, Ivyland, Pa.

Finally, in “Improving Control,” Dan Black, a control systems engineer at Techni-Systems LLC, Chelan, Wash., describes how state-of-the-art refrigeration controls can be the key element in energy-saving strategies for industrial refrigeration operations and cold storage facilities.

Anne Armel, Group Publisher,