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HMD Series Membrane Dryers

The Next Generation In Membrane Technology
Advancements in design allow membrane technology to efficiently dehydrate compressed air. Versatile, environmentally and user-friendly, membrane dryers are the ideal solution for low flow and point of use applications.
Unit of Measure



N/A 41 in1041 mm


N/A 4.2 in106.7 mm


Inlet Connection Size

N/A 0.5 in12.7 mm

Outlet Connection Size

N/A 0.5 in12.7 mm


N/A 9.5 lb4.3 kg

Dew Point Temperature

N/A -40 to +50 ºF-40 to +10 ºC


N/A Hankison® HMD RHD SPX®

Durable Construction

Maximum Working Pressure

N/A 175 psig12.3 kg/cm²

Maximum Inlet Operating Temperature

N/A 150 ºF66 ºC

Materials of Construction

End Caps

N/A Nylon



Inlet/Outlet Fittings

N/A Brass

Dedicated to Excellence

Dedicated to Excellence

N/A Since 1948, compressed air users around the world have relied on Hankison® to provide innovative compressed air treatment solutions for critical applications. Hankison® maintains a long standing reputation for manufacturing products that deliver superior performance, time proven reliability and optimal energy savings. Hankison® today is the preferred choice for providing clean, dry compressed air for the most challenging industries.

Based in Charlotte, North Carolina, SPX® Corporation (NYSE: SPW) is a global, multi-industry manufacturing leader with approximately $ 5 billion in annual revenue, operations in more than 35 countries and over 14,000 employees. The company's highly-specialized, engineered products and technologies are concentrated in Flow Technology and energy infrastructure. Many of SPX®'s innovative solutions are playing a role in helping to meet rising global demand for electricity and processed foods and beverages, particularly in emerging markets. The company's products include food processing systems for the food and beverage industry, critical Flow components for oil and gas processing, power transformers for utility companies, and cooling systems for power plants.



  • Lightweight - can be installed without additional support.
  • Operates in both horizontal and vertical orientation.
  • Convenient mounting systems available.
  • High inlet and outlet flows.
  • Dryers may be sized to produce dew point temperatures from -40 ºF (-40 ºC) or below to +50 ºF (+10 ºC).



  • Low sweep air rates - more air available downstream.
  • Choice of Prefilter packages:
    • HF Series Grade 5 high efficiency oil removal filter for normal applications.
    • HF Series Grade 7 air line filter and Grade 3 ultra high efficiency oil removal filter for critical applications.

Low Maintenance

Low Maintenance

  • No power source required.
  • No moving parts to maintain, repair or wear out.
  • No consumables to replace.
  • No liquid condensate to dispose of.

Drying Protection

Drying Protection

  • Pressurized air is contained inside the membranes.
  • Housing contains air at atmospheric pressure.
  • No oil/water emulsions or chemicals to dispose of.



N/A 3 Year Warranty

Standard one year warranty is extended to three years when the dryer is installed with an optional prefilter package. To keep the warranty in effect, cartridges must be replaced at six month intervals and the drain mechanism yearly.

Fitness Guarantee
If during the first three months of operation, you are not satisfied with the suitability of the membrane dryer for your application, return the dryer for full credit. The credit can be applied to the purchase of any other Hankison® drying equipment.

How it Works

How it Works

N/A Compressed air, saturated with water vapor, flows through a bundle of tube-shaped hollow membrane fibers. A sweep orifice installed at the end of the bundle meters the amount of sweep air required to remove the water vapor from the dryer. Dry air then exits the tube bundle for use downstream. As long as the dried air isn't exposed to temperatures below the specified pressure dew point, no troublesome liquid water will form in the air system.