Technology

Safe Compressed Air Drying Systems for Class I, Division 1 Environments

By Jess Elley, Product Marketing Manager, Suburban Manufacturing Group – Tsunami Compressed Air Solutions

Learn how engineers can safely remove moisture from compressed air systems in hazardous environments by eliminating ignition risks through pneumatic controls. This article explores design considerations, performance characteristics and reliability factors for regenerative desiccant dryers operating in Class I, Division 1 locations.

Read Full Story

The ANSI/ISA Instrument Air Standard and Adsorption Type Dryers

By Deepak Vetal, National Sales Manager, Blowers and Low-Pressure Compressors, Atlas Copco Compressors, LLC.

ANSI /ISA–7.0.0–1996 is the globally-recognized quality standard for instrument air as defined by the Instrument Society of America. In this article, we’ll go through the Standard’s four elements of instrument air quality for use in pneumatic instruments.

[ Read Full Story ]

Compressed Air Purification Fundamentals-the Compressor’s Job

By Tim Dugan, P.E. President, Compression Engineering Corporation

The air we breathe and the air compressors ingest is a mixture of gases, aerosols, biological material, and particulates. It’s a real mess! Particulate, for instance, is very harmful to humans, because lungs are complex oxygen separators, not filters. They tend to load up with particulate, this is harmful over time. There isn’t a sufficient “pre-filter” to prevent all harmful particulate from entering the lungs. However, humans prefer water in the air, gas, aerosol, and to a certain level, liquid form. A de-humidifier would not typically be a healthy addition to our built environments.

[ Read Full Story ]

Understanding Controls for Multiple Centrifugal Air Compressor Systems

By Tim Dugan, P.E. President, Compression Engineering Corporation

Load-sharing is an important part of a multiple centrifugal-compressor master control system. It minimizes blow-off based on the available turn-down. In addition, remote start-stop saves more energy if load floats between different ranges. Finally, adding a screw compressor and implementing a hybrid control system might save the most energy and provide the best back-up. In any case, a well-instrumented system allows engineers and operators to assess, optimize and tune the system.

[ Read Full Story ]

Applying Centrifugal Air Compressors for Variable Loads

By the Compressed Air & Gas Institute Centrifugal Compressor Section

There are many choices of compressor technology and types of controls that can be used for variable demands. Some examples are rotary screw compressors with inlet valve control: variable speed drives: load/unload control; or centrifugal compressors with variable inlet guide vanes. However, in many cases, the efficiency of the overall compression process can be reduced significantly during lower flow demands, leading to more power per unit of air flow being delivered. It is very important to evaluate different available options and see how a plant can run most efficiently.

[ Read Full Story ]

Centrifugal Air Compressor Controls and Sizing Basics

By Tim Dugan, P.E. President, Compression Engineering Corporation

Larger air compressors, typically over 500 hp, in refineries, pulp and paper plants, chemical and other processing plants often have high-speed, multi-stage air compressors called “centrifugal” air compressors. As seen from a total system perspective, they are not much different than screw air compressors. They compress air to plant pressure from atmospheric conditions, and deliver it to the dryer. These types of air compressors have no internal wearing parts, besides bearings and seals, and are very reliable and efficient, at their best efficiency point.

[ Read Full Story ]

Overhauling an Air Compressor: Cost Control, Rigorous Testing and Quality Parts

By Ingersoll Rand

Knowing when to overhaul a unit is important, and there are certain signs indicating a unit needs attention. Performing routine fluid checks, taking oil samples and routinely checking for bearing vibration can unveil indicators suggesting an upcoming failure. Oil contamination with metal fragments usually indicates parts are wearing. It’s also important to take notice of airend temperature increases. If internal air compressor temperatures go up, it’s a good indicator the cooler may be failing.

[ Read Full Story ]

Master Controls for Multiple Air Compressor Systems with VFD Compressors

Tim Dugan, P.E. President, Compression Engineering Corporation

When a system has the right combination of VFD and base-load air compressors, how do you coordinate their control? What tells the air compressors to run and load, to have just enough (or no) base-load air compressors and a VFD running, all the time air is needed? Appropriate master controls are needed. These controls are often called “sequencers” or “master control systems”.

[ Read Full Story ]

Sizing VFD Compressors for Multiple Air Compressor Systems

Tim Dugan, P.E. President, Compression Engineering Corporation

It is becoming a “best practice” to install a variable frequency drive (VFD) air compressor whenever one is replacing an old air compressor. As a result, real systems have fixed-speed and VFD air compressors, mixed. I have observed several VFD compressor sizing methods. In my last article, I referred to a common method: size one VFD compressor for the whole system. This can work. However, if it doesn’t meet a higher peak demand, one or more of the old compressors will be started, and a mixed system results. Another method is to replace a compressor with the same size, but with a VFD. If the compressor that was replaced is large, a big VFD is installed. If small, a small one.

[ Read Full Story ]

Sizing VFD Air Compressors for Single-Compressor Systems

By Tim Dugan, P.E. President, Compression Engineering Corporation

As an end user, have you ever heard the message to put in the biggest VFD air compressor, and the system will always be reliable and efficient. Why do an audit? Just add up the compressors on site and put one VFD for that size or larger. Why have the complexity of multiple compressors, storage, sequencing, etc? Even better, put in two of them, one for the whole system, and one for back-up. If you could wave a wand, wouldn’t that be what every system should look like? Perfect peace and efficiency, with 100% confidence of reliability.

[ Read Full Story ]

Analysis of Current Air Compressors and Dryers in a System Assessment

By Don van Ormer, APenergy

A complete compressed air system assessment should provide detailed information on both the supply and demand sides of the system. The supply-side refers to the equipment supplying compressed air – the air compressor, dryers, filters, piping and storage tanks. The purpose of this article is to illustrate what information we believe a factory should receive from a supply-side system assessment and more importantly – what information a plant should always know about their compressed air system.

[ Read Full Story ]