Compressed Air Controls supply air compressor accessories
Compressed Air Controls can design the air compressor setup
We can also install these accessories and repair and maintain them.
We can also retrofit some accessories, like air dryers and Variable Frequency Drives (VFD/VSD).
These accessories include ELGi:
- Variable Frequency Drives (VFD/VSD)
- Air receivers
- Air dryers
- Oil-water separators
Compressed Air Controls also supply Donaldson drains.
Why do you need air compressor accessories for your industrial air compressor?
Otherwise, your compressor could choke on contaminants and break down frequently and also have a shorter life.
Contaminanted air could negatively affect the product you are producing as well. If contaminated air is used to spray paint a car, for example, then the paint could end up with fine particles in it.
Compressed Air Controls follows best practice for removing contaminants from compressed air by supplying air accessories
We will provide the correct sized moisture separators, so that maximum bulk moisture is removed from the system and is not carried over to the downstream equipment.
We will also provide the correct coalescing filter type, rating, size, and appropriate preceding level for the selected filters. We will also replace the filter element at proper service intervals.
We can supply electronic drains. These play an important role in removing the condensate from the compressor and downstream equipment. We will properly maintain and replace the electronic drain regularly, as per recommendations.
Air dryers and filters are a must. An air dryer should be in front of the fine filter and carbon filter so that the compressed air is free from water vapour. This is critical, as the vapour can choke the filter element. A particulate filter is recommended after the desiccant dryer and before the fine and carbon filter.
If your site needs more stringent air quality, we will recommend having an additional desiccant dryer, which will give a lower dew point, and filter set near the point of use.
ELGi air dryers
ELGi refrigerant and desiccant dryers and filtration can make technically oil-free air.
ISO 8573-1 2010 down to Class 1.1.1.
How do compressed air dryers work?
EGRD Refrigerant air dryer
The hot high-pressure refrigerant enters into the condenser in a gaseous state and gets cooled through the forced circulation of cold air using a fan and flows to the expansion valve in a liquid state.
It is reliable and eco-friendly, it is great for demanding applications, and uses ozone-friendly R 134 A and R 407 C refrigerants for minimal impact on the environment.
Desiccant air dryer
This granular desiccant bed in the first tower absorbs moisture from the air. The second tower takes the dry purge air from the outlet of tower one and feeds it through a purge valve to regenerate the granular desiccant bed.
As a default, all HLD models above 5X are provided with a Dew Point Stretch Cycle and Purge Optimizer.
The Alocrom aluminium treatment is a special feature of all ELGi Airmate die-cast filter housings. This treatment ensures there is no corrosion and no carryover of corroded particles into the airline, which can otherwise cause blockades in sophisticated parts.
High-efficiency General Purpose Protection.
For the removal of particles down to 1 micron including coalesced liquid water and oil, providing a maximum remaining oil aerosol content 3 of 0.5 mg/m @ 21ºC
High-Efficiency Oil Removal Filtration.
For the removal of particles down to 0.01 micron including water and oil aerosols, providing a maximum remaining oil aerosol content of 0.01 mg/m @ 21ºC. (Precede type FF with type PF)
Activated Carbon Filtration.
For the removal of oil vapour and hydrocarbon odour giving a maximum remaining oil content 3 of <0.003 mg/m (<0.003 ppm) (excluding methane) @ 21ºC. (Precede type CF with type FF & PF)
Donaldson UFM-D drains
These offer silent operation, fast return on investment and a low maintenance option to handling the liquid condensate, which naturally accumulates in various spots within a compressed air system.
Condensate must be drained frequently, and typical drains are prone to loss of valuable compressed air. The UFM-D drains offer the ability to silently and cost-effectively drain condensate from your compressed air system.
- Electronically level-controlled minimizes loss of costly compressed air
- Easy service with all maintenance parts in a single unit
- Manufactured with corrosion-resistant materials
- Silent operation
- Air compressor aftercoolers
- Air receivers
- Coarse coalescing prefilters before refrigerated and desiccant dryers
- Fine coalescing prefilters after refrigerated and desiccant dryers
- Refrigerated dryer cold-points or outlets
- Desiccant dryer outlet
ELGi Air Receivers
The ElGi Air Receiver is engineered to handle the stress of fluctuating air demands, reduce wear and tear and increase the life of the end-use equipment.
What are the benefits of air receivers?
Stored Energy: The primary role of an air receiver tank is to provide temporary storage for compressed air. It stores compressed air that can be used for short spikes in demand, also referred to as ‘events of sudden demand’. It also acts as a standby supply system, when tricky situations may arise at a factory including, power outage for a short period (typically switching from a grid to generator), a sudden unplanned loss of supply from a compressor (typically from breakdown), etc. Think of the importance of a battery with UPS supplying power for a computer to function without disruptions, the air receiver is that reliable battery source which enables smooth functioning of your business.
Stabilizer: Fluctuating compressed air utilization causes uneven demand on the air compressor, resulting in rapid cycling of the air compressor controls as the air compressor turns on and off to meet moment-by-moment demand.
Each time the system turns on and off (or loads/unloads) it is called a “cycle.” It is better for the air compressor motor and other components to keep these cycles as long as possible. This is true for all upstream equipment like dryers, particle filters etc. The stabilized flow through these systems allows the equipment to function to its intended performance.
Improves Efficiency for Air Compressors: As the air compressor cycles on and off, compressed air can be wasted. Every time a rotary screw air compressor cycles to unload, the Separator tank is blown-off from its operating pressure typically from 7 bar to near atmospheric pressure. Compressed air is released during the venting.
With cycling once every few seconds (typically under a minute) this adds up to the loss of a sizeable percentage.
Improves Efficiency for Dryers: If used as a wet tank (or receiver before the dryer) the receiver acts as a heat exchanger, cooling off the air and thus condensing some moisture before it reaches the dryer. The water drains out of a valve at the bottom of the tank. By removing some moisture in advance, the air receiver tank reduces the amount of work the air dryer needs to do. This is true for any dryer type from refrigerated air dryer to desiccant dryers.
Improves efficiency for Coalescing filters: The moisture removal to some extent allows the filters to be relatively dry, in comparison to the direct handling of compressed air coming from the compressor, for the same reason as mentioned above.
There are two types of compressed air storage: wet and dry.
The tanks are the same; the difference is in where they are installed within the system.
Wet receiver tanks are located before the compressed air dryer. Some functions of the wet receiver include:
- Isolating the compressor from demand events
- Reduces/eliminates compressor cycling
- Allows the compressor to remain unloaded for a longer time
- Acts as a backup for compressor failure
Dry receiver tanks are located after the air dryers, to store compressed air that has already been dried to its desired level of the application.
- Dry compressed air is available closer to the application and is hence available in the case of a high-demand event or supply failure.
- Dry storage reduces the burden on the air dryer during high-demand events. Without a dry air receiver (but having a wet receiver only), during sudden spikes in demand, the dryer can be subject to higher volumes than the dryer is designed/rated for. This leads to lower drying efficiency and may also result in sudden pressure drops, leading to unwanted water in the air lines and the application desiring of pressure.
It is recommended that the dry receiver is larger than the wet receiver by 2 to 3 times to take care of the points mentioned above. Most applications require a combination of wet and dry storage for optimal efficiency and performance.
What does an Oil-water separator do?
As the name suggests, it separates condensate from the compressed air.
When the air is compressed through the air compressor, it results in condensate, a mix of water, oil, and dust particles, along with compressed air.
If not treated properly this condensate can have detrimental effects on the environment.
Regulatory bodies for effluent treatment recommend that this condensate should be cleansed before releasing it to the sewage disposal.
ELGi EOS series is specifically designed to maintain less than 10ppm of oil in the condensate before allowing the fluid to pass on to the environment. The multi-level separation process, of super-efficient fibre adsorbent and activated carbon, ensures the contaminant levels are kept well within the statutory requirements.
How to select an oil-water separator to remove the oil from the oil emulsified condensate before discharging it to the sewage:
- Selecting the correct oil-water separator and element is important for removing oil from the condensate within the permissible limits allowed in the region. This is expressed in terms of ppm units. Usually, it is set from 10 to 15ppm.
- It is important to see that the oil-water separator selected is compatible to operate with the compressed air and condensate mixture flowing through the condensate line.
- The ppm level after separation needs to be monitored thoroughly. If the ppm level is above the recommended level, then the element needs to be replaced. Some of the oil-water separators also have a life indicator for elements to ensure ease in identification
ELGi Conserve Variable Frequency Drives (VFD/VSD); how does a Variable Frequency Drives (VFD/VSD) work?
ELGI Conserve VFD matches output with demand by varying the motor speed and the power consumption reduces in line with the reduction in demand.
What are the benefits of using a Variable Frequency Drive (VFD/VSD)?
A Variable Frequency Drive (VFD/VSD) saves you energy.
It eliminates the frequent load-unload cycle which wastes power.
A fixed speed compressor operates on a load-unload band of at least 10 psi around the working pressure; an ELGI VFD, the compressor can be operated within a band of 2 psi. Since compressors are not operated under higher than working pressure requirements. There is substantial energy saving; for every 2 psi reduction in operating pressure, there is 1% power saving.
In a fixed speed compressor with a Star-Delta starter, starting current is as high as three times the full load current (FLC). With ELGi VFD starting, starting current is equal to the full load current (FLC). This helps to avoid using heavy rated components like fuses, MCCB, cable size, generator rating, isolators etc.
For compressed air systems with fluctuating demand patterns, the return on investment due to power saving will be less than 12 months.
Read more about the ELGi air accessories Compressed Air Controls can supply you by downloading the ELGi air accessories brochure here.
Contact us for advice; we can design air compressor setups, supply, install or retrofit some accessories and maintain all of these products.