Screw Compressors

As Western Australia’s largest independent provider of air compressors, compressor products and services, Cleveland Compressed Air Services in Perth is able to provide our customers with the right screw compressors for their needs, taking into consideration their process requirements.

A screw compressor is a positive displacement rotary compressor, with two screw elements that are under continuous rotation. Due to the continuous rotation, there is very little pulsation of flow, which gives it a significant advantage over piston compressors.

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A basic overview of different types of compressed air quality

  Compressed air is widely used in everyday life, both in the home (e.g. aerosol cans) and for industrial purposes (food processing, electronics, health care, photography, dairy and instrumentation), so much so that consumers often don’t think twice about it. When people sit down to a meal, for instance, the last thing they think about is the quality of the compressed air that was used in the preparation and manufacture of their food. Little do they know that many food manufacturing companies would not be able to function or provide consumers with safe, contaminant-free products without the use of clean compressed air. From an industrial standpoint, compressed air is often the energy source that powers up pneumatically operated equipment and tools, including those that mix up granular products, aerate liquids and even render meat products. In addition, they are widely used to convey materials and protect equipment or personnel. It is important to note that not all compressed air is the same. The quality of compressed air is actually subject to quality standards, commonly referenced as ISO 8573-1:2010, and determined by measuring three contaminants: Oil content Water vapour Solid particles According to this measure of quality, there are six different classes or levels of compressed air quality, depending on contaminant level and type. Contamination levels are obviously influenced by the type of air compressor that is used, along with the related compressed air filtration and compressed air dryer units. Typically, however, compressed air quality is divided into four groups based on usage, which are as follows: 1. Breathing air The most common applications for breathing air are found in hospitals or medical facilities, as well as for underwater activities. If you have ever been scuba diving, then you definitely understand the importance of having air that is safe to breathe, free of contaminants and that contains a certain amount of water vapour. On the ISO 8573.1 scale, this comes in at class 1 for contaminants or particles (i.e. there should be none of these present) but in classes 4 to 6 for water vapour. 2. Process air When manufacturing a product that will be consumed by humans or animals, process air is often used in the production process. Not surprisingly, compressed air that meets the standard needs to have zero oil or particle contamination, so food manufacturing companies or even drug companies require their compressed air quality to meet ISO 8573.1 class 1 or 2. 3. Power air Usually used in pneumatic pumps or equipment such as those used for sandblasting, for instance, the quality of compressed air used for these purposes tend to be a little lower than the first two types of compressed air mentioned above. For power air, oil droplets or water vapour might cause a bit of a nuisance, but it certainly isn’t life threatening. In order to not damage equipment and clog up filters, power air needs to meet class 4 or 5 of the compressed air quality standard. 4. Instrument air Used for pneumatic instrumentation purposes, the compressed air quality for instrument air needs to be higher than that of power air, and generally meets class 3 or 4 of the compressed air quality standard. This is not only to protect the equipment and instruments that it is being used for, but also to protect the quality of the finished product. Instrument air with a high level of contaminants could affect the quality of the product that it is being used on, such as in paint spraying, for example, or cause untimely instrumentation breakdowns, leading to lost revenue.


The different types of compressed air dryers

As those who work in industries that require the use of compressed air know, it is very important not to get excessive water trapped in the air, whether in the vapour or liquid phase. Compressed air contains not just water droplets and vapour but also debris, oil, and other foreign matter. If there is too much water vapour in the compressed air, this could cause a number of operational problems that range from corrosion and rust in pipelines to fouling of processes and frozen external airlines. Compressed air dryers are mechanisms that remove water vapour from compressed air. There are three common types of compressed air dryers: refrigerated compressed air dryers, membrane compressed air dryers and desiccant compressed air dryers. Refrigerated Compressed Air Dryers These dryers operate via the use of air-to-air and air-to-refrigerator heat exchanges. Incoming compressed air is cooled by the air-to-air exchange, as the outgoing cool and dry air reduce the temperature of the warmer incoming air. This incoming air then goes into the air-to-refrigerator exchanger, where the temperature is reduced through the use of liquid refrigerant to 3 degrees Celsius. This condenses any moisture that is present in liquid water, which subsequently drains off, and the cool outgoing air starts off the process all over again. Membrane Compressed Air Dryers Membrane dryers remove both contaminants and water vapour, as they are a filtration system that works with existing compressed air systems. Humid compressed air passes through a bundle of hollow fibres made of a membrane designed specifically to attract water vapour. Moisture is diffused through to the outside of the thin membrane where it is removed, and the higher the pressure in the compressed air system, then the better the membrane dryer will perform. This is a space saving system and does not use refrigerating agents in its operation. Desiccant Compressed Air Dryers As the name suggests, this type of compressed air dryer works by moving compressed air through a compartment that is filled with desiccants. Desiccants are materials with natural moisture absorbing properties. A desiccant compressed air dryer or regenerative dryer as it is also known usually has two identical desiccant chambers. The unit will automatically use one compartment to dry out compressed air while the other compartment, which is also filled with desiccant, is being regenerated. The use of the two compartments alternate automatically, ensuring a constant supply of dry compressed air, and because it self-regenerates, it also allows for easy maintenance of the unit. The regeneration can be done utilizing heat, compressed air, vacuum or a combination of these technologies.


Basic overview of the different types of air compressors and their benefits

When it comes to the types of air compressors that are available on the market, there are as many kinds as there are uses for an air compressor. The choice of which air compressor is right for you largely depends on the industry that it is being used in, whether it’s a compact, relatively silent scroll air compressor for the workshop you’re after, or the centrifugal, which is used in large industrial facilities, petrochemical and utilities. Here at Cleveland Compressed Air Services, our wide selection of quality air compressors include: Oil Lubricated Compressors Boge Screw Compressors SolidAir Screw Compressors Boge Piston Compressors Oil Free Compressors Boge Piston Compressors Boge Screw Compressors Cameron Turbo Compressors LENTO Water Injected Screw Compressors High Pressure Compressors Cameron High Pressure Compressors Boge Piston Compressors Piston (also called reciprocating) compressors and screw compressors are the most commonly used types today, and these come in oil lubricated and oil free models. The benefits of oil lubricated compressors include durability, capability to work in extreme environments, longer life spans and better protection against interior rust; however, they do have what is known as “oil carryover”, where a portion of the lubricant comes out with the compressed air. Also, oil lubricated models require re-oiling, oil changes and are heavier. For industries where the air that comes out needs to be completely oil free, oil free compressors are used. These compressors are more expensive to procure and do require more energy to produce the same amount of air; however, the lower maintenance of filtration and no oil change requirement do offset some of the costs. The oil free screw compressors also have a limited life and drop in efficiency overtime owing to the Teflon coating required on the rotors for self-lubrication. Water injected screw compressors do not suffer from the same problem, as water is a very good replacement for lubricating oil. Oil free compressors are also noisier but water lubricated machines have a lower noise output due to the dampening effect of water. Piston compressors, which start up quickly and can be left idle for long periods of time, are usually used in smaller factories and workshops with some use in specialised high pressure applications. Small piston compressors are easy to maintain and cheaper than many of their counterparts, the bigger range being very expensive to maintain and operate. Screw compressors, on the other hand, are used in situations where there is a larger air demand. They are known for their durability, consistently high output and acceptable operating volume level. Although they are generally more expensive than piston compressors, screw compressors do use less energy, are more reliable and, if properly maintained, can be left to run constantly. Centrifugal compressors are dynamic in nature and, therefore, are continuous flow units that are able to cater for large flow rate requirements in oil free and plant air applications. The centrifugal technology was originally limited to low pressure applications but these days medium to high pressure ranges are also catered for. The advantages of going with centrifugal compressors include oil free air production, low specific energy requirement, low maintenance and high reliability. The versatility of air compressors, and the high quality of our compressors in particular, make them especially reliable pieces of equipment that can be used in a variety of industries. These include: Heavy industry Medical Mining Oil and gas Workshop Food and Beverage Of course, these are only some of the uses of air compressors, which have gone from being staple pieces of equipment in power stations, oil and gas rigs, and manufacturing plants to home workshops and garages.


BOGE S4 Series – Built to Perform in the Mining Industry

The new S-4 BOGE screw air compressor is whisper-quiet with efficient operation, boasting innovative separator technology, simple maintenance and the best efficiency rates in their class!  Perfect for the Mining industry Low maintenance costs, minimum downtime Increased efficiency BOGE effilence lntegrateDrive airend Noise-optimised cooling air Low-speed radial fan Elasticated SilentMount bracket Easy-access, maintenance-friendly design Innovative separator technology for convenient, safe cartridge change


A look at our range of BOGE oil free piston air compressors

At Cleveland Compressors, we are proud to be Western Australia’s largest independent provider of air compressors, compressor products and services. Our range of air compressors is especially popular and used in various industries for purposes including tooling, instrumentation and other process applications as an energy source. Our range of BOGE oil free piston air compressors is offered as part of our wider range of oil free air compressors. Like the others, it provides customers looking for an alternative to oil lubricated compressors with top quality equipment that they can rely on. Here, we’ll look at the models that we have available in greater detail.  BOGE Oil Free Piston Compressors (8, 10, 15 & 35/40 bar) Known for their reliable precision and high quality standards, BOGE offers the following variants in their oil free piston range: ASO/BSO Series ASO(L) BSO(L) BSO(L) DM K Series K Booster PO Series  ASO / ASOL Series Features: A base mounted piston compressor unit that is able to provide an individual solution to your compressed air requirements. Also available as a super-silenced model. Benefits: Lower costs and less time spent when extending your system Energy cost savings due to base-load and peak-load compressors  BSO / BSOL Series 1. Receiver Mounted Compressor Features: Its modular assembly system allows the selection of individual compressors and receiver sizes depending on the application. Also available as a super-silenced model. Benefits: No special foundations required Most economic unit designed for each compressed air demand Customised solution for each application Super-silenced model that can be installed directly in the workplace Galvanised pressure receiver 2. Duplex Compressor Package – Receiver Mounted Features: Works economically when compressed air demand fluctuates greatly. The compressors can be switched as base-load or peak-load machines, or as load and standby-compressors with 100% reserve capacity. Also available as a super-silenced model. Benefits: Energy cost savings by avoiding high power peaks Stand-by compressor for expansion, peak demand and air supply during maintenance periods Uniform loading Super-silenced model that can be installed directly in the workplace Galvanised pressure vessel BSO / BSOL DM Series 1. Compressor Unit – With twin air receivers Features: A complete system with the compressor installed directly onto twin air receivers. 2. Compressor Station – With twin air receivers and membrane dryer Features: Provides simple compressed air drying with: No condensate discharge No moving parts No electrical connections No CFCs Dry compressed air No additional space required for the dryer 3. Compressor Station – Super-silenced Features: Comprises a compressor, twin air receivers and membrane dryer (optional) in a super-silenced housing. Can be installed directly in the workplace. Benefits: Minimum installation costs Practically maintenance-free Energy cost savings A positive contribution towards protecting the environment Galvanised pressure receiver No foundations Minimum space required K Series Features: In an entirely new and compact design, the K series represents the latest compressor technology for oil free air compression with minimal wear. Oil level checks are no longer required and neither are belt replacements. K-type models are designed for one-stage compression up to 10 bar and two-stage compression up to 40 bar. Benefits: Reduced downstream air treatment costs during operation Condensate treatment eliminated Reduced service time costs Reduced service component costs Modular design means easy expansion K means reduced energy consumption Completely ready to install K Booster Features: Takes in pre-compressed and pre-treated compressed air from an existing network or from a low pressure compressor and compresses it to the required higher final pressure. For anyone who wants to compress to maximum pressure in an economic and oil-free way! Benefits: Oil-free booster compressor From an inlet pressure of 10 bar to a final pressure of 40 bar (maximum) Unique in the category up to 5.5 kW No treatment needed Low-wear operation BASIC-control and IE3 motor for energy-efficient operation Reciprocating duct according to push rod principle Intelligent cooling air duct Compact construction Absolutely oil-free generated compressed air Ideal for sensitive application areas PO Series Features: The completely oil free piston compressors in the new series provide high quality compressed air with exceptional efficiency. With special attention to low-wear operation, extremely compact footprint with the closed hood concept, high operational reliability has combined with environmental friendliness. PO series meets the requirements of the RoHS Directive (2002/95 /EC). Benefits: Significant efficiency gains and higher free air delivery Reduced noise Compact design with easier maintenance Low-wearing Reduced downstream air treatment costs during operation Modular design means easy expansion Ready to install


The benefits of different types of compressed air dryers

Continuing on from our last article where we talked about the different kinds of compressed air dryers that we provide, this article will look at the benefits of each of these types of compressed air dryers, as well as some of their respective key features. Here at Cleveland Compressed Air Services, our range of compressed air dryers has been selected based on their uncompromising performance and reliability, as well as their ability to deliver the right balance of air quality with the lowest cost of operation. We are proud to offer our customers three kinds of compressed air dryers, namely: Refrigerated air dryers Desiccant air dryers Membrane dryers Refrigerated air dryers When it comes to refrigerated air dryers, we have available the Domnick Hunter refrigerated air dryers and the Parker Hiross Starlette Plus dryers. Domnick Hunter Polestar Smart Refrigerated Air Dryers (450-10,800 M3/H) A standout feature of these air dryers is that they actively remove the condensation that is caused by air entering the compressed air system to achieve extremely dry compressed air. Their other benefits include: Optimum dewpoint levels for highest system performance Advanced patented design Environmental, lowest real operating costs High reliability, easy to use and maintain Unique 4-in-1 SmartPack heat exchanger Integral drain Extremely low pressure drop design Innovative SmartControl energy saving function Excellent dewpoint performances Advanced compliant scroll compressor Parker Hiross Starlette Plus dryers (Up to 360 M3/H) Parker Hiross offers a range of refrigerated air drying solutions using advanced refrigeration technology. Among the key features of their Starlette Plus dryers are: State-of-the-art PlusPack heat exchangers (patent pending) Extremely compact Low operating costs Environmentally friendly High operating limits Reliable airtight piston compressors that do not require preheating Simple and secure refrigeration circuits that do not require adjustment during operation and undergo vigorous quality testing in production Large adjustable condenser and fan compartments to guarantee optimum performance even in extreme conditions Security protection in the refrigeration circuit, increasing reliability and safeguarding the air dryer Simple disassembly, with easy access to the internal components for efficient maintenance Drain positioned in a niche, allowing easy access without the need to remove the top panel High-pressure version available Desiccant air dryers Depending on the application, there are three types of desiccant air dryers that we are able to provide: modular, point of use, and twin tower. For modular desiccant air dryers, our range includes the Domnick Hunter Pneudri Range Modular Desiccant Air Dryers (3 SCFM and larger). The benefits of the Pneudri range are: “Multi-banking” capability ensures the system can meet any required demand Totally clean and dry compressed air down to-40oF (-40oC) pressure dewpoint (PDP) as standard Can be specified to provide a pressure dewpoint of -100oF (-70oC) PDP for critical applications No pressure vessel certification or inspections required For point of use desiccant air dryers, the FDD desiccant dryer series carries the following features: Finite® Filter’s unique in-line air/gas dryer system for easy desiccant change-outs, longer life and lower pressure drop Removes water vapour and aerosols at point-of-use for intermittent flows up to 60 SCFM A colour changing moisture indicator with visual sight gauge indicates the need for desiccant replacement Zinc head / steel bowl with integral Sightglass Sintered bronze elements that prevent desiccant carry over Maximum operating temperature: 180°F Maximum working pressure: 300 PSI For twin tower desiccant air dryers, we offer the following: AIRTEK Series (Heatless, Heated, Blower Purge, High Pressure) BALSTON Regenerative PSA Desiccant Air Dryers Domnick Hunter Twin Tower Desiccant Dryers (Heatless, Heated, Blower Purge, Vacuum Assist Zero Purge) ZANDER Twin Tower Desiccant Dryers (Heatless, Heated, Blower Purge, Vacuum Purge) Membrane dryers The Parker Balston Membrane Air Dryers combine superior coalescing technology with a proven innovative membrane system to supply clean, dry compressed air with dewpoints as low as -40°F (-40°C). Engineered for easy installation, operation and long-term reliability, they also have the following benefits: Highly efficient Minimal maintenance Require no electricity Dewpoints as low as -40°F Explosion proof Silent operation No desiccant to change Prevent freeze-ups Low operating cost Reliable, efficient economical alternative to PSA and refrigerant dryer technologies Want to know more? Speak to us today to find out more about our range of compressed air dryers, or for help with accurate selection and sizing of an air treatment system.


Speak to us today

We know that your business looks for every competitive edge in a tough marketplace. Reducing the cost of energy overhead is a challenge and we offer quality solutions through high calibre products and services. At Cleveland Compressed Air Services, we believe that your success is our success. That is why we provide top notch solutions and support to businesses using our quality products, whether through purchase or hire. After purchase or hire, our stellar customer care draws from a nationwide network of manufacturer trained technicians, ready to serve you 24 hours per day, seven days a week.

Ready for solutions to compressed air or energy problems?  Please call us at +61 8 9452 3669, email us at or contact us online.