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Brand: Donaldson
Donaldson SPN 0003-0063 VarioDry Membrane Air Dryer
Description
A point-of-use membrane dryer with no electrical supply
The Donaldson VarioDry SPN 0003-0063 is a membrane air dryer for point-of-use drying of compressed air. Humid air flows through a bundle of hollow fibres whose membrane attracts water vapour; the vapour diffuses through the thin selective layer to the outside, where a small partial flow of dried air, expanded to atmospheric pressure, sweeps it away in counterflow.
There are no valves, controllers or electrical connections, the noise level is very low and the module is maintenance free. Nine models handle 3 to 63 m3/h inlet flow, and dew point reduction can be set anywhere up to 40 K, depending on how much of the flow is used as purge.
Technical specifications
| Parameter | Specification |
|---|---|
| Models | SPN 0003, 0006, 0009, 0012, 0018, 0024, 0036, 0048, 0063 |
| Inlet flow at table conditions | 3.0 to 63 m3/h (35 C, 7 bar(g), 20 K dew point reduction) |
| Dew point reduction | Up to -40 C (previous SP series: maximum -27 C) |
| Maximum operating pressure | 12.5 bar(g) |
| Maximum operating temperature | 60 C |
| Pressure drop | 0.2 bar(g) |
| Prefiltration required | 1 micrometre particle filter and 0.01 micrometre oil coalescing filter |
| Purge air | About 15 percent from 35 K dew point reduction (SP: 18 percent) |
| Fibre architecture | Diagonal cross-wrapped hollow fibres |
| Versions | SPN, and SPN Superplus with DF housing, type S element, econometer and float drain |
| Power supply | None required |
Outlet flow against dew point reduction
- SPN 0003: 20 K inlet / outlet m3/h 3.0 / 2.7; 35 K 2.2 / 1.9; 55 K 1.4 / 1.1; 75 K 1.0 / 0.7
- SPN 0012: 20 K inlet / outlet m3/h 12.0 / 10.8; 35 K 8.5 / 7.3; 55 K 5.7 / 4.5; 75 K 4.1 / 2.9
- SPN 0024: 20 K inlet / outlet m3/h 24.0 / 21.6; 35 K 17.0 / 14.6; 55 K 11.3 / 8.9; 75 K 8.2 / 5.8
- SPN 0048: 20 K inlet / outlet m3/h 48.0 / 43.2; 35 K 34.1 / 29.3; 55 K 22.7 / 17.9; 75 K 16.4 / 11.6
- SPN 0063: 20 K inlet / outlet m3/h 63.0 / 56.7; 35 K 44.8 / 38.5; 55 K 29.8 / 23.5; 75 K 21.6 / 15.3
Values are inlet / outlet flow at 35 C and 7 bar(g); the sheet gives all nine models. For other pressures the table value is the nominal flow divided by a pressure factor, from 0.41 at 4 bar(g) through 1.00 at 7 bar(g) to 2.22 at 12 bar(g).
Using a membrane dryer well
The higher the pressure of the air, the better the membrane works, and a falling inlet dew point also lowers the outlet dew point, so the drier follows the load. Because the membrane is damaged by oil and dirt, Donaldson requires prefiltration; SPN Superplus already carries a DF housing with a type S element and an econometer, and a connection kit allows horizontal or vertical mounting.
Typical uses are laser cutting, instrument air at isolated points, analysers and paint shop equipment. The sheet names chemical and pharmaceutical, food and beverage, paint and finish, machine building, environment, energy and PCB assembly as the industries. It also compares the new SPN with the old SP design: maximum flow doubles from 32 to 63 m3/h and the maximum dew point reduction improves from -27 C to -40 C.
Documents and quotation
Before ordering SPN 0003-0063, confirm the required dew point reduction, working pressure and the pre-filter. The data above comes from Donaldson VarioDry SPN 0003-0063 membrane air dryers data sheet (F119067, 03/2026), attached here, and we reply in writing. Compare Compressors.
Datasheets & Documents
- Datasheet Donaldson VarioDry SPN 0003-0063 membrane air dryers data sheet (F119067, 03/2026) Download
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About brand
Donaldson is the American filtration company founded in Minnesota in 1915. It started when Frank Donaldson Sr. built an air cleaner for a tractor engine that kept failing in dusty fields. It is now headquartered in Bloomington, Minnesota, and makes filters and filtration systems for engines, hydraulics, compressed air and gases, dust collection and process liquids.
Seven Star LLC is an independent supplier in Muscat. We list Donaldson compressed air dryers and filters, gas filter housings, activated carbon adsorbers, hydraulic and fuel filtration and dust collectors, and supply them and their replacement elements in Oman and the GCC.
Donaldson company profile
| Established | 1915, Minnesota, USA, by Frank Donaldson Sr. and his family |
|---|---|
| First product | An air cleaner for tractor engines |
| Headquarters | Bloomington, Minnesota |
| Product families | Engine air and fuel filters, hydraulic and lube filters, compressed air and gas filters and dryers, dust collectors, process and sterile filtration |
Milestones
- 1915: Frank Donaldson Sr. builds an air cleaner for a tractor that kept failing in a dusty field; the family starts Donaldson Company in Minnesota.
- 1917: Air cleaners are supplied for artillery tractors.
- 1920s: Exhaust products are added after crop fires caused by engine sparks.
- 1974: Donaldson acquires Torit, the dust collector business.
- 2015: The company marks its 100th year.
Donaldson products we list
| Family | Models | Typical use |
|---|---|---|
| Compressed air filters and drains | DF Ultra-Filter, DF-T three-stage, DF-C cyclone, UFM-P drain | Removing water, oil and particles from compressed air |
| Adsorption and refrigeration dryers | Ultrapac HL, HRE+, HRS+, HRS-L+, HLP, Buran, Bora, HRC-T hydrogen | Instrument air with a low dew point, high-pressure air and gas drying |
| Activated carbon and breathing air | Ultrasorp AKC, Ultrasorp Smart, Ultrapure ALG breathing air, A element, AK element | Removing oil vapour and odours for food, pharma and breathing air |
| Gas filter housings | EG (ATEX), HD high-pressure | Process gases and high-pressure gas filtration |
| Hydraulic and fuel filtration | FLK, HNK Duramax, filter cart, Filter Buddy, T.R.A.P. breather, P568583, P574958, AG1398001 skid | Cleaning hydraulic oil and bulk fuel and keeping moisture out of tanks |
| Dust collection | DCE 125 B bin vent | Silo and bin venting for cement, powders and bulk solids |
Compressed air quality is set by ISO 8573-1 classes for particles, water and oil. A typical instrument air system uses a coarse filter and a fine coalescing filter before the dryer, an adsorption dryer for a low pressure dew point (for example -40 °C), and a dust filter after it. An activated carbon stage removes oil vapour where the air touches food or is breathed. Heatless dryers use some of the dry air to regenerate the desiccant, while heat-regenerated and zero-purge types save that air on larger systems.
Where Donaldson products are used
In Oman and the GCC, Donaldson filters and dryers are used for instrument and plant air in oil and gas, refining, power and desalination plants, for breathing air, in food and pharmaceutical production, on hydraulic systems and fuel storage, and in cement and bulk handling.
Ordering Donaldson products: what we need
Send the model and size from the nameplate. For dryers and filters, add the flow (m³/h or scfm), working pressure, inlet temperature, required dew point or ISO 8573-1 class, and the supply voltage. For replacement elements, send the element part number or the housing model.
Facts checked against Donaldson company history, October 2026.
Browse Donaldson products by category: Compressors, Filter Housings, Filtration Systems, Filtration Elements.
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Frequently Asked Questions
Does the SPN dryer need electricity?
No. It has no electrical supply, valves or controller; it works on the pressure difference across the membrane.
What flows does it cover?
Nine models from 3 m3/h (SPN 0003) to 63 m3/h (SPN 0063) at 20 K dew point reduction, 35 C and 7 bar(g).
Does it need a pre-filter?
Yes. The sheet requires a 1 micrometre particle filter and a 0.01 micrometre coalescing filter; SPN Superplus includes it.
What is the maximum pressure?
12.5 bar(g) at up to 60 C.
What is purge air?
Part of the dried air that is expanded to atmosphere and sweeps water vapour from the outside of the fibres; about 15 percent from 35 K dew point reduction.
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