Engineered Vacuum Packages for High Vacuum Applications: The Travaini HydroTwin & OilTwin

Travaini’s new series of compact, high vacuum packages are capable of a working vacuum level of 29.86. HgV and flow rates up to 2100 ACFM. This new design has been developed through a partnership with Bora Blowers and Travaini Pumps USA. Bora Blowers specializes in the manufacturing of boosters for pressure and vacuum applications. Leveraging Bora’s sophisticated electronics for controlling boosters, the partnership customized the technology to couple the liquid ring vacuum pump and the booster. This innovation, along with a unique sensor configuration, allows precise control and protection that traditional packages simply can’t offer.


  • Minimize the Absorbed Power: Compared to traditional liquid ring systems, energy savings could add up to over 30%. A 15hp package can provide deeper vacuum at higher volumes than a 30hp two stage liquid ring pump by itself
  • Safeguard Your Processes: Our unique design and advanced controller protects critical processes with the ability to precisely set and maintain required vacuum levels. This optimizes the reaction to conditions and minimizes losses
  • State of the art Technology: The DVD2 “Digital Vacuum Drive” controller and unique sensor configuration maintain even temperature by controlling compression rates. This prevents the elevated temperatures to protect the booster.
  • Plug and Play: Multiple preset modes applied at Travaini provide a ready-to-use product. This saves you time reprogramming for different processes or shift changes. Additional adjustments are easy to make. This slide illustrates how a 10hp Liquid Ring Vacuum Pump operates alone (blue) and then how it operates with only a 5hp booster added, (red). The significant gain in capacity is presented in green. This 15hp package will give the same flow and deeper vacuum than a 30hp two stage pump.


  • Chemical: Solvent extraction, gas evacuation from tanks
  • Plastics: Degassing
  • Pharma: Stabilization and controlled filtration / crystallization process
  • Food Industry: Water evaporation, vacuum coolers
  • Leather: Treatment & vacuum drying

about high vacuum packagesIn high volume, critical applications where strict control of high vacuum levels are imperative, these packages from Travaini are the logical solution. Lewis Systems will be happy to take a look at your current applications or help you with designing your next system. Contact us today.

Summer Preventative Maintenance For Your Compressed Air System

During the summer, there are a few extra challenges your compressed air system faces. Heat and humidity can cause all sorts of problems if you don’t prepare your system to adequately address them. Here are a few simple reminders of things to check to prevent downstream problems and equipment failures.

Heat Exchanger

Heat Exchanger

    • Condensate Drains – With the extra humidity there will be extra water. Check all of your drains and drain lines to ensure they are sized correctly and operating properly.
    • Heat Exchangers – Check your after coolers and oil coolers to make sure they are clean and the fans are operating correctly. These coolers are your primary defense for keeping your oil temperatures acceptable and removing the bulk of your liquid water from your compressed air system.

Gardner Denver Heated Purge Dryer

  • Air Dryers – Both refrigerated and desiccant compressed air dryers need to be checked and prepared for the summer heat and humidity. Condenser coils and condenser fans should be checked on refrigerated dryers. Pre-filters and drains should be checked and serviced on desiccant dryers to protect the desiccant bed from slugs of liquid water and oil.
  • Oil/Water Separators – All the water that your drains and dryers are removing should be routed to an Oil/Water Separator. These separators help you safely and legally dispose of your compressed air condensate. Be sure to replace all carbon bags and filters every six months to ensure proper operation.


Lewis Systems & Service Co., Inc. carries a full line of drains, dryers and filters to help your compressed air systems to deal with the heat and humidity that the summer brings. So give us a call if you find yourself “under water” this summer.


Air Compressor Buyers Guide

In our air compressor buyers guide, we’ll discuss the two main types of air compressors, their key traits, and the factors to gardner denver air compressorconsider before purchase.

Rotary screw and reciprocating air compressors are two very common types of positive displacement compressors.  Both can be found in a wide variety of applications and industries. There are however some differences between the two. It’s important to take some time to understand these differences and how they are best applied to your requirements. By doing so, you can make a wise investment in an efficient and reliable air compressor.

Reciprocating Air Compressors – Reciprocating compressors, also known as Piston compressors, can be found in variety of designs but most commonly are used in applications under 30hp. Also, whenreciprocating air compressor pressures over 150 psi are required a piston compressor would typically be used. Known for their durability in demanding applications, they can do well in a variety of industrial needs. They can be mounted on tanks or base mounted and driven by electric motors or gas engines. This flexibility also makes them an attractive option. The maintenance on a piston compressor should also be a consideration.  Valves, piston rings and other parts normally require consistent routine maintenance.

rotary screw air compressorRotary Screw Air Compressors – Rotary screw compressors can be very efficient and require less maintenance than piston compressors. These compressors are designed to perform best when a constant volume of compressed air is necessary at pressures up to 150 psi.  Because of their dependability and long life cycles they are usually a great fit for standard plant air. Maintenance on a rotary screw is usually just filters and lubricant. With the use of sound dampening enclosures, noise levels can be dramatically less than that of a reciprocating compressor.

After evaluating which type of compressor fits your application and requirements the best, you will then need to closely examine the factors that will help you find a quality compressor that will last and provide you with a good return on your investment.


Reciprocating Air Compressors

air compressor buyers guide

Considerations for reciprocating compressors:

  • What are the pressure (PSI) and air flow (CFM) requirements?
    • An overloaded compressor will not last so don’t under size your compressor requirements just to be cheap.
  • Will the demand be constant or will it vary?
    • Reciprocating compressors can run stop/start, load/unload or a combination of the two.
  • How much storage (tank size) will be needed?
    • Adequate storage can greatly reduce the load on your compressor.
  • What is the quality of air required downstream?
    • Extra treatment such as dryers and filtration may be necessary. Oil-Less reciprocating compressors are available if necessary.

Features to look for in a reciprocating compressor:

  • Slower speed operation – longer service life
  • Cast iron crankcase – durable construction
  • Valve construction – look for disc-type valves for increased reliability
  • Main bearings – look for over-sized tapered main bearings
  • Extreme duty and higher operating pressures – look for a compressor with a positive displacement oil pump
  • Centrifugal unloader – allows for load-less starting reducing wear on motor/engine
  • Warranty – Industrial Reciprocating compressors should be built to last, make sure that your investment is backed up by a solid warranty with local support for parts and service.

Rotary Screw Air Compressors

If you’ve decided that a rotary screw compressor is right for your requirements, how do you know what to look for in one and what differentiates the good from the not so good?

Quality – the air end is the heart of your compressor, be sure it’s built with quality and backed by a long warranty.  Make sure the manufacturer has a robust re-manufactured air end program available. Other system components should be scrutinized as well.

Size and Serviceability – a small footprint is great, but make sure you can still easily service the compressor. Most packages can be offered with an integrated air dryer which can reduce space and piping requirements.

Noise Levels – newer compressor designs and enclosures can reduce noise levels, allowing greater flexibility on installation locations.


Cooling Method – will it be air cooled or water cooled? Considerations must be made on where the water will come from if it’s water cooled and how to deal with the ambient air conditions if it’s air cooled.

Fixed Speed or Variable Speed – is your demand constant or does it vary?  A variable speed compressor can offer considerable energy savings if your plant demand varies a lot.


Control Systems – there is a huge variety of controllers in the market now that can control and monitor everything, but sometimes simplicity is better.  Don’t over complicate things if you don’t have to. Take time to look at the controllers and make sure they are easy to use.

Total Cost of Ownership – be sure to consider not only the purchase price but the maintenance costs and the energy cost to operate your compressor. Energy costs can account for over 80% of the total cost of ownership.

Service & Support – a solid warranty backed up by local support for service and parts. Look for factory trained technicians that can fix your equipment quickly and professionally.


We hope our air compressor buyers guide answered all you questions but if you still need help, contact us today. Whether you’re looking to purchase, repair or maintain air compressors, you’ve come to the right place. At Lewis Systems, we welcome the opportunity to be your partner in success.

Considerations for Maintaining Compressed Air Dryers

Compressed air dryers have become an integral part of most compressed air systems today.  They help prevent product spoilage, equipment malfunction and system failure.  Although they are an important piece of your compressed air system, it’s easy for them to be overlooked until a problem arises.  Here is a short list of items to keep an eye on to ensure your downstream air is clean and dry.

Refrigerated Dryers:

  • Temperature Checks – Ensure the inlet and ambient temperatures are within the acceptable ranges for your specific dryer.
  • Condenser Coil – With an air-cooled dryer, it is important to clean off accumulated dust and dirt nano compressed air dryersmonthly, and in dirtier environments, remove debris every two weeks. Water cooled units usually have a strainer that needs to be inspected and cleaned monthly.
  • Moisture Separator / Coalescing Filter – Should be checked monthly to ensure proper operation. If equipped with an internal element, it should be replaced at least annually or when the pressure drop becomes excessive.
  • Condensate Drain(s) – Should be checked daily to ensure the condensate is being discharged from the unit. Most electric and zero loss drains are equipped with a test button.  If a standard internal float drain is being used, it should be replaced annually.

Desiccant Dryers:

  • First and foremost, desiccant dryers are pressure vessels. Make sure all safety procedures are followed when inspecting or servicing this type of equipment.  Always de-pressurize before servicing.
  • Coalescing Pre-filter – Removes any remaining oil and water aerosols before the air hits the desiccant bed to prevent saturation and oil contamination. Check the drain mechanism on this filter daily.  The element should be replaced every 6-12 months.
  • Particulate After-filter – Prevents downstream air system from being exposed to desiccant dust. Element should be changed at least every 12 months.
  • Desiccant – Should be replaced whenever the required dew point can’t be maintained if operating conditions are correct and there are no other mechanical issues. Desiccant life is determined by the quality of the inlet air.  Installing and maintaining a proper Coalescing Pre-Filter will extend the life of the desiccant.
  • Purge Mufflers – Should be checked regularly and changed annually. Desiccant dust can clog muffler elements over time, creating back pressure and restricting purge flow.
  • Valves – Every “adsorption” type desiccant dryer is different in design, but they all have to switch towers and regenerate during normal operation. Always inspect the switching valves and purge valves for proper operation and follow the manufacturer’s guidelines on preventative maintenance for these valves.

If you need help maintaining these or any other parts of your compressed air system, we are here to help.  From training your own personnel, to full maintenance contracts, we welcome the opportunity to be your partner is success.  Contact us today!

Compressed Air Dryers and Moisture Content

nano compressed air dryersCompressed air is commonly referred to as the 4th utility, which is why facility managers are concerned with the quality and moisture content of the air going into their plant. High levels of moisture (water and oil) can cause premature wear on tools, cylinders and valves as well as increase corrosion and bacteria/mold growth inside the piping network. Installing a compressed air dryer will drastically reduce the moisture content and eliminate these problems; however, selecting the correct dryer technology is important.

Refrigerated style compressed air dryers are common and operate similarly to an air conditioning unit by cooling the incoming compressed air, condensing water vapor into liquid and then removing through a separator with a drain valve. Refrigerated dryers are limited by temperature and cannot cool below 32°F (0*C), as the condensed liquid would freeze. Pressure dew point is defined as the temperature at which water vapor condenses into a liquid at a given pressure. Based on this definition, a refrigerated dryer will deliver a pressure dew point range just above 32°F. As a reference, compressed air at 38°F pressure dew point and 100 psig pressure contains 609 ppm(w) of moisture.air compressor moisture content

Types of Refrigerated Air Dryers

There are several different types of refrigerated dryers including non-cycling, cycling and variable speed dryers.  Each technology refers to the operation of the refrigeration compressor. The compressor runs continuously in a non-cycling dryer, independent of the thermal load. Similar to your home refrigerator or air conditioning unit, a cycling dryer turns the refrigeration compressor on and off based on a varying system thermal load. Your home is the thermal mass for your air conditioning unit which allows the compressor to cycle on and off. Cycling compressed air dryers utilize a thermal mass such as silica or glycol to cycle the refrigeration compressor and a variable speed drive compressor increases or decreases the speed and subsequent capacity of the compressor relative to the compressed air consumption.

To achieve a pressure dew point below 32°F, a different technology known as adsorption is required. Small beads or granules of desiccant material are extremely effective in removing moisture, similar to the small bags you might find in a new pair of shoes or jacket pocket. In the adsorption process, the desiccant media pulls the moisture out of the compressed air stream and holds it on the surface of the beads. Over time, the beads become saturated and require regeneration. During this phase of the process (commonly referred to rair compressor moistureegeneration or desorption), a portion of the dried air from the online tower/vessel is used to flow through the saturated tower to remove the moisture. As a reference, compressed air at a -40°C/F pressure dew point and 100 psig pressure contains 10 ppm(w) moisture content and meets ISO 8573 class 2.

The ISO 8573 group of international standards is used for the classification of compressed air purity. The standard provides the test methods and analytical techniques for each type of contaminant. The table to the left summarizes the maximum contaminant levels specified in ISO 8573.1: 2010 for the various compressed air quality classes.

Nano-Purification Dryer Solutions

Nano R1-Series (NXC) thermal mass refrigerated dryers utilize a reliable, simple and energy-efficient stationary silica mass dryer design to achieve a 38°F pressure dew point (ISO Class 4 moisture vapor). If you require a lower pressure dew point for high technology lab or process applications, the nano D-Series (NDL, NHL, NEX and NBP) utilize highly efficient desiccant and advanced controls to effectively remove moisture content down to a -40°C/F pressure dew point or lower (ISO Class 2/1 moisture vapor). Contact your local compressed air professional at Lewis Systems to find out which dryer technology is right for your specific application at your facility.

Guest post written by: Mark Lauterwasser, Business Development Manager at nano purification solutions. For more information, visit