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New generation air dryer

Location:New York City

Division:IMI Precision Engineering

Date:October 2014

Maintenance engineers at New York City (NYC) Transit had experienced conditions where moisture in compressed air caused mechanical problems on subway cars.

The engineers found that the standard pressure dryers removed damaging moisture when they were first installed on the subway cars, but performance progressively declined, especially during hot, humid New York City summers.

IMI Precision Engineering’s Adsorbent Media Tube (AMT) dryer uses a patented technology radically different from conventional desiccant beads. This design delivers higher moisture uptake and faster purging without degrading the dryer media, improving both performance and longevity.

NYC Transit replaced the conventional pressure dryers with AMT test units, and after 12 months of operation, the test results showed that the air leaving the dryers was as dry as when the system was first installed.

NYC Transit now has a dryer that is projected to last up to 6 years, or 18,000 service hours, significantly exceeding the specified two-year maintenance cycle.