The HPD Series
Hankison‘s externally heated purge desiccant dryers offer guaranteed dew point performance, ISO Quality Class 2 air and are equipped with our advanced Ambient Air Amplification (A3) Purge TechnologyTM.
The standard design delivers ISO 8573-1: 2010 dew points between Class 2 and Class 3. Class 2 (-40°F/-40ºC) dew points protect against freezing during low ambient conditions and Class 3 (-4°F/-20ºC) dew points keep your air system dry during the heat of summer. Applications that require Class 2 (-40°F/-40ºC) dew points year round simply need to select the Free-Air (FA) Supercharger option package.
Feature
- Soft-seated check valves for tight shutoff and durability
- Towers filled with extra, high-grade activated alumina
- Low-watt density heater saves energy and prevents premature desiccant aging
- Heavy-duty air intake filter
- NEMA 4 Construction
- Premium quality inlet switching/purge exhaust butterfly valves on 3” and larger (High quality pneumatic angle-seated valves for smaller sizes)
- Optional EMS controlled Free-Air Supercharger uses A3 Purge TechnologyTM
Reduce Purge Air Energy Costs
As energy costs continue to escalate globally sustainability initiatives in plant operations are critical to maintain a competitive advantage.
HPD Series dryers are 100% efficient at delivering full supply-side compressor capacity. Therefore, users benefit from the ability to purchase a less expensive air compressor and a 20% reduction in compressor operating costs.
Eliminate air loss to align supply-side equipment with demand-side requirements to optimize your air system.
How it works
Moist, filtered compressed air enters the pressurized on-line desiccant-filled drying Tower 1 through valve (A). Up-flow drying enables the desiccant to strip the air stream of moisture. Clean, dry compressed air exits through valve (E) to feed the air system. Tower 2 (when in regeneration mode) closes valve (B), then depressurizes to atmosphere through muffler (C). Valves (D & G) open and the heater turns on. A portion of dry compressed air (purge air) is diverted before exiting (E) and passes through the heater. Hot dry purge air desorbs the moisture from the desiccant as it flows down through Tower 2 to exit at valve (D). Once desorbed, the heater turns off and cool dry purge air continues to pass until the desiccant bed is cooled. Finally, valve (D) closes and Tower 2 is repressurized. At a fixed time interval, valve (B) will open and Tower 2 will be placed on-line to dry the bed and valves (A & D) will close. Operations will switch and Tower 1 will be regenerated
HPD Series Specification
1 Performance data per CAGI Standard ADF 200 for Desiccant Compressed Air Dryer. Rating conditions are 100°F (37.8°C) inlet 100 psig (6.7 barg) inlet pressure, 100% relative humidity, 100°F (37.8°C) ambient temperature, and 5 psig (0.35 barg) pressure drop.
* Consult factory for larger models.
