A choice of performance The Atlas Copco SD dryer range includes the P and N model range, each offering 7 different size dryers.

P range: Ensures a suppression of 32ºC (55ºF), giving at the reference conditions an outlet air dew point of 3ºC (40ºF), similar to a well-designed refrigerant-type
air dryer.

N range: Lowers the inlet dew point with 55ºC (100ºF), giving a pressure dew point of -20ºC (-5ºF) at the reference conditions.


Standard equipment

• P urge block, fitted onto the dryer, controls the purged air

• Two pre-filters, all interconnection components included, ensure optimal inlet air quality

• Flexible inlet and outlet caps allow filters and dryer to be mounted in two settings for optimal use of available space

Optional equipment

• Purge air stop to save purge when there is no air consumption

• Wall mounting kits for easy dryer installation

• Wall mounting kits for filters

• Quick filter coupling, ensures easy connection to drain collector or oil/water separator

• 4-20 mA filter read out, providing an external system with the exact dP across the filter

• Voltage-free filter contact, mounted on the differential pressure gauge, to give remote indication of cartridge replacement

• EWD electronic filter drain with alarm function ensures no loss of compressed air


Atlas Copco’s SD membrane dryers with pre-filters remove oil, particles and moisture from compressed air in the most demanding conditions. They ensure the lowest pressure drop and purge air loss for the highest possible efficiency – saving you time and money through your production process. From small spaces to environments with fluctuating ambient temperatures, SD dryers can perform in a wide variety of harsh and critical conditions. Two models are available, each with a range of performance, to offer you the exact air treatment you require.

Atlas Copco’s unique SD dryer range ensures the lowest pressure drop and the lowest purge air use – providing real energy savings without compromise in production reliability and efficiency.

Advanced Fibre Technology: maximizing efficiency Atlas Copco’s membrane dryers contain thousands of hollow fibres with a pioneering inner coating. As wet compressed air enters, the membrane coating allows water vapour to permeate and collect between the fibres, while the dry air continues its journey. Compared to conventional membrane dryers, the unique coating increases the separation efficiency between water vapour and oxygen and nitrogen, giving an unprecedented low air leakage and the lowest purge air loss.

Custom fitted membranes: optimizing choice SD dryers are offered with two types of membranes, each providing a different Pressure Dew Point Suppression (PDPS: see above). This choice of performance ensures that regardless of

your production environment and demands, there is an SD dryer to meet your needs.

Low air resistance: saving energy Due to the straight-forward design of SD dryer, compressed air has no twists and turns to make inside the housing – ensuring
minimal pressure drop and utmost efficiency throughout the drying process.

Membrane dryers lower the temperature at which condensation is formed by bringing down the dew point temperature of the inlet air.
Their performance is measured by Pressure Dew Point Suppression, PDPS. For example, if inlet air is 35°C (95°F) and 100% saturated, the inlet dew point is also 35°C. An Atlas Copco SD dryer of the P range will lower the dew point by 32°C, so the outlet pressure dew point will be 3°C. Therefore the PDPS is 32°C.



Customer benefits

Versatility – SD dryers perform in all sorts of areas: small spaces, areas where flexible mounting is required, high vibration areas and in widely fluctuating temperatures.

Safety assurance – SD dryers provide dry air in environments with strict safety or environmental requirements. These include low flow environments, areas without an electrical supply, explosion-proof facilities, noise-sensitive and corrosion-sensitive areas.

Clean and dry air for critical applications – Because they are not powered by electricity, SD dryers function safely in environments that must be explosion-proof, such as laboratories. Thanks to their quiet operation, they can be used close to the workplace.

Optimal efficiency – SD membrane dryers contain thousands of hollow fibres with an innovative inner coating. Compared to conventional membrane dryers, this unique coating increases the separation efficiency between water vapour and oxygen and nitrogen, giving an unprecedented low air leakage and the lowest purge air loss.

Flexibility in choice – SD dryers are available in two models, each with a different Pressure Dew Point Suppression. This choice of performance ensures that, regardless of your production environment and demands, there is an SD dryer to meet your needs.

Energy savings – Due to the straightforward design of the SD dryer, compressed air has no twists and turns to make inside the housing. This leads to minimal pressure drop and utmost efficiency throughout the drying process.


Membrane dryer refers to a dehumidication membrane that removes water vapour from compressed air. It is used in pneumatic components, air bearings, air spindles, medical equipment, air guns and pneumatic brakes for vehicles & trains.


How A Membrane Dryer Works

The membrane dryer is a unique and efficient way to remove various contaminants from an existing compressed air system, and lowers both the dew point and the relative humidity all at the same time.

The membrane dryer is a progressive system of filtration media, designed to work with your existing compressed air system.  The membrane dryer consists of a unique four stage filtration system.  This system progressively cleans the compressed air from liquids and other contaminates.  With an automatic moisture discharger located under the second stage filter, any liquids removed will be expelled once an ounce of liquid is collected.

After the four stage pre-filter has properly cleaned the compressed air, the membrane goes to work.

The membrane, though a process of osmosis, removes any remaining moisture vapour back into the ambient atmosphere.  The result is ultra clean and ultra dry air, with a dew point reduction of -32 to -55 degrees, and a relative humidity resulting in the single digits.
           
The membrane dryer further improves the air quality by lowering both the dew point and relative humidity.

Membrane Dryers Provide Unmatched Performance for Years!

The membrane dryer does not use any electricity and only requires simple maintenance of the four stage pre-filters.  With regular maintenance, the membrane dryer will provide years, and years of superb and unmatched performance for the low initial investment and the affordable consumables.

When properly installed with a ball valve prior to the membrane dryer, the use of compressed air, is reduced to a flow only when the ball value is in the on position and the membrane itself allows a small sweep air to exhaust the removed moisture.

Its compact design allows for simple installation and will fit in the tightest of spaces, and can go around or into a corner situation if necessary.

As technology continues to evolve the use of a membrane dryer is expected to replace the refrigerated air dryers as a way to provide the ultra clean, and ultra dry air when and where it is truly needed at a lower cost to provide and maintain.

Membrane dryer refers to a dehumidification membrane that removes water vapor from compressed air.

Typically, the compressed air is first filtered with a high-quality coalescing filter. This filter removes liquid water, oil and particulate from the compressed air. The water vapor–laden air then passes through the center bore of hollow fibers in the membrane bundle. At the same time, a small portion of the dry air product is redirected along the outside surface of the fibers to sweep out the water vapor which has permeated the membrane. The moisture-laden sweep gas is then vented to the atmosphere, and clean, dry air is supplied to the application. The membrane air dryers are designed to operate continuously, 24 hours per day, 7 days per week. Membrane air dryers are quiet, reliable and require no electricity to operate.

Some dryers are non-porous, which means they only permeate water vapor. Non-porous membranes' drying power is only a function of flow rate, pressure. The sweep flow is strictly controlled by an orifice and is not a function of temperature.

Porous membranes are modified nitrogen membranes and pass air as well, usually changing the composition of the compressed air by reducing the oxygen content. The only maintenance required is changing the prefilter cartridge twice a year. The performance of porous membranes are dependent on temperature as well as operating pressure and flow.

Membrane air dryers depress the incoming dew point. Most dryers have a challenge air dew point and pressure specification. So if the inlet dew point is lower than the specified challenge air then the outlet dew point is even lower than specified. For example, a dryer could be rated at a −40 °F dew point with a challenge of +70 °F dew point and 100 psig. If the incoming air has an inlet dew point of only 32 °F, the outlet dew point will be somewhat less. Pressure also plays a role. If the pressure is higher than the rated specification then the outlet dew point will be lowered. This lowering of the outlet dew point is due to the longer residence time that the air has inside the membrane. Using the spec above, an operating pressure of 120 psig will yield a lower outlet dew point than specified. The extent of the improvement is dependent on the nature of the membrane and could vary among manufacturers.

Dew point suppression is not a feature of refrigerated dryers, as they chill the incoming air to a fixed temperature, usually 35 °F. So a lower dew point challenge will not yield a dew point lower than 35 °F.

Membrane air dryers are used in pneumatic components, spray painting, laser plenum purge, air bearings, air spindles, medical equipment, air guns and pneumatic brakes for vehicles and trains.

Membrane air dryers utilize specially formulated membrane microtubes selectively permeable to water vapour are an excellent medium for producing dry air from standard compressed air. As the compressed air travels along the length of the membrane, water vapour diffuses through the membrane, producing clean, dry compressed air at the outlet. A small fraction of the dry air is then directed along the outside surface of the membrane to “sweep” the moisture-laden air away from the membrane. The water vapour concentration differential between the compressed air inside the membrane (high water vapour content) and “sweep” air outside the membrane (low water vapour content) enhances the drying characteristics of the membrane.

Coalescing filters should be installed upstream from a membrane dryer to protect the membrane from being saturated by water or coated by oil. If saturation or coating occurs, the membrane drying function could be seriously inhibited. In most cases, the coalescing filter is ideal for installation upstream from a
membrane dryer. When large quantities of liquids are expected, a coalescing filter should also be installed. CPS Hire / Atlas Copco offers a wide range of membrane dryers, conveniently installed for most point-of-use applications, which reduce dewpoints of incoming compressed air to -40°F (-40°C),
depending on flow and pressure characteristics of the air. Specifying the Right Dryer In specifying the right dryer for a compressed air installation, keep the following information in mind:

1. Do not over specify - Drying the entire compressed air supply in a factory to dewpoints less than -40°F (-40°C) is wasteful. It is more sensible to subdivide the compressed air supply by application, treating each end use point as needed to provide appropriately dry air for the downstream application served.

2 Do not underspecify - Damage caused by wet air costs money in maintenance time and supplies, downtime, and lost product. Design a drying system to meet specific needs.

3 A drying system which only contains an aftercooler and a coalescing filter could create problems with condensation downstream from the aftercooler. The air is still saturated with vapour which is likely to condense if the ambient temperature is lower than the compressed air temperature.

4 Utilize the ‘drying’ effect of pressure reduction-For applications which use air at lower pressures than the main compressed air line and will tolerate some water vapour, install filters or filter-regulators at the point of use to maximize the ‘drying’ effect of pressure reduction.

5 Specify membrane dryers for those parts of the system which require dewpoints of 35°F - 52°F (2°C - °C) and flow rates up to 600 SCFM (17 NM3/min).

6 Specify membrane dryers for instrument quality air, air exposed to freezing temperatures, and water sensitive applications requiring flow rates up to 100 scfm. Typically, compressed air with a dewpoint of -40°F (‑40°C) is reasonable for these water vapour sensitive applications.

Exceptional dependability
The new KMM dryer design provides many advantages over conventional membrane dryer models, as the 'Inflow' concept ensures outstanding drying results through highly effective moisture removal, enhanced pressure stability and reduced differential pressure. Furthermore, in combination with KAESER compressed air filters, the design also provides protection from any contamination that may enter the dryer, as it is trapped before it can reach the sensitive membrane fibres.


High performance flow system
The flow concept of inside to outside permeation enables the highly resistant membrane fibres in the dryer insert to ensure exceptional drying results.


Efficient “Helix” Structure
The internally coated membrane fibres are wound in a “helix” structure that increases the fibre surface area in contact with the compressed air. This results in even air distribution and increased efficiency in a reliable, compact drying unit.


Precision Purge Air Nozzle
Precision purge air delivery via a specifically dimensioned nozzle significantly reduces operating costs, as only the required volume of compressed air for purge use is diverted.


Energy-Saving Purge Air Stop Valve (option)
To avoid unnecessary flow of purge air, the solenoid stop valve on the purge air outlet can be set to close during times when there is no compressed air demand.

In order to be First in Mind—First in Choice™ for all your compressed air needs, Atlas Copco delivers the products and services that help increase your business’ efficiency and profitability.

Atlas Copco’s pursuit of innovation never ceases, driven by your need for reliability and efficiency. Always working with you, we are committed to providing you the customized quality air solution that is the driving force behind your business.

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SD2P-7 Standard Membrane Air Dryer 

SD2 N Membrane Dryer

Product Code: SD2P         Pricing: $2,063 +GST    Pricing: $2,186 +GST (purge control option included)

Product Code: SD2N         Pricing: $3,505+GST    Pricing: $3,677 +GST (purge control option included)

Description: Atlas Copco Membrane Air Dryer with prefilters to remove oil, particles and moisture from the air in the most demanding conditions. Dew Point suppression of 32°C

Type
WP Bar
Capacity FAD L/s
Capacity FAD m³ 
PDP Reduction
PD bar
Connection
Supplied Filters
Weight
Dimensions
SD2P
10
4.0
0.24
32°C
0.10
G3/8"
DD+PD9
3.0 kg
55 / 532
SD 2N
71.50.0955°C
0.08
G3/8"DD+PD93.0 kg55 /532




PDP - Pressure Dew Point . WP - Working Pressure . FAD - Capacity, Free Air Delivery. PD - Pressure Drop  Also available in 7, 10 or 13 Bar variants.

Type
WP Bar
Capacity FAD L/s
Capacity FAD m³ 
PDP Reduction
PD bar
Connection
Supplied Filters
Weight
Dimensions
SD1P
10
4.0
0.24
32°C
0.10
G3/8"
DD+PD9
3.0 kg
55 / 532
SD 1N
71.50.0955°C
0.08
G3/8"DD+PD93.0 kg55 /532




PDP - Pressure Dew Point . WP - Working Pressure . FAD - Capacity, Free Air Delivery. PD - Pressure Drop. Also available in 7, 10 or 13 Bar variants.

SD1P-7 Standard Membrane Air Dryer 

SD1 N Membrane Dryer

Product Code: SD1P         Pricing: $1,653+GST    Pricing: $1,765 +GST (purge control option included)

Product Code: SD1N         Pricing: $3,065+GST    Pricing: $3,226 +GST (purge control option included)

Description: Atlas Copco Membrane Air Dryer with prefilters to remove oil, particles and moisture from the air in the most demanding conditions. Dew Point suppression of 32°C

MEMBRANE DRYERS

Atlas Copco’s SD membrane dryers with pre-filters remove oil, particles and moisture from compressed air in the most demanding conditions