IIAR and the AIM Act By Chris Savage – August 2025 For many years now Carlson & Stewart Refrigeration has been a member of IIAR, The International Institute of All-Natural Refrigeration. As the name implies, IIAR is an advocate for the all-natural refrigerants and their applications. When talking about all-natural refrigerants we are primarily talking […]
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CUI – Corrosion Under Insulation By Chris Savage – January 2025 “Solid as steel”, “strong as steel”, “ steel-like resolve”, “forged in steel”, “tough as nails”, or even the “Man of steel”, are all terms that invoke thoughts of strength, invulnerability, durability, etc. Our world relies heavily on steel for almost anything you can think
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Doors vs No Doors – Refrigerated Supermarket Retail Cases If you are reading this, you are probably no stranger to the fact that refrigerated retail case manufacturers sell cases both with and without doors. So you might be wondering which you should choose in your store? Well, like many choices in life, the answer always
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New Stuff Author: Chris Savage Here at Carlson & Stewart Refrigeration, we try hard to stay abreast of new technologies, new products, and or new ideas of any kind. Especially as they relate to refrigeration, of course. Recently I became aware of a couple of new products that I thought I would share. The first
CO2 Condensing Units Author: Chris Savage Here at Carlson & Stewart Refrigeration, we are very aware of the of the emphasis on “natural refrigerants”. In fact, a big portion of our business is in the use of Ammonia as a refrigerant. The other side of our business is smaller, what we call “commercial refrigeration” and
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Condenser Drop Legs Last week I had the opportunity to attend a RETA Safety Day. At this meeting I listened to a presentation on purging non-condensables and it reminded me of an important design aspect when designing/installing the piping for ammonia condensers. The situation I am thinking about primarily concerns installations involving multiple condensers, or
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Hazard Analysis By Chris Savage Most of us in the ammonia refrigeration world are aware of the OSHA and EPA compliance guidelines. You are familiar with PSM (Process Safety Management) by OSHA and the RMP (Risk Management Plan) by the EPA. These 2 programs are very similar, with only a few minor differences. But the
Honeybee’s By Chris Savage You might be thinking, why the heck would there be a blog post on a refrigeration website about honeybee’s? Up to about a month ago, I would have been thinking the same thing! Recently Carlson & Stewart Refrigeration was contacted by a local, South Dakota, honey producer. He called with some
Moisture Control By Chris Savage Moisture control…..what does that mean? Relative humidity, dew point, condensation, evaporation, dry bulb, wet bulb, enthalpy, specific volume, humidity ratio, vapor pressure, dehumidification, desiccant, reheat, grains of moisture…..these are all terms that you might come across when you start talking about moisture control. If any of this terminology is unfamiliar
Over the years there are and have been a variety of compressor styles that have been used in ammonia refrigeration systems. Each of these compressor styles accomplish the same task of increasing the pressure of ammonia vapor. They provide the motivating force that moves the refrigerant through the system. So, what type of compressors do
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