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HDF Series Single-Tower Desiccant Dryers
| PRODUCT | TYPE | FLOW | RATING |
|---|---|---|---|
| Desiccant Air Dryer | Single Tower | 5 to 30 SCFM | 200 psig / 125°F |
Specifications
Configuration & Size
Sizes:
5, 10, 20 and 30 SCFM at 100 psig
Connections:
1/4 in (5, 10) and 1/2 in (20, 30)
Desiccant:
1, 2, 4 or 6 lb silica gel
Power:
None
Features
- Silica gel turns from blue to white as it loads, so the operator sees when to recharge
- Built-in 15 micron cleanable dust filter
- Powder-coated aluminum housing that mounts inline
- Coalescing prefilter available as the -F version of each model
The last stage before the gun
A canister of silica gel, not a regenerating dryer
The HDF Series is a single tower of silica gel that adsorbs the water left in the air after the plant's dryer and holds on to it. It does not regenerate. The gel changes from blue to white as it loads, and when the color front reaches the end of the tower the charge is replaced with a refill kit. With no valves, timer or power, it fits on a booth wall or at a workstation where nothing electrical is wanted.
A fresh charge reaches dew points as low as -40°F, which is what an HVLP finish or a moisture-sensitive tool wants at the moment of use. The dew point then climbs as the gel fills, so the HDF is a polishing stage, not a substitute for a refrigerated dryer on the compressor. Put it downstream of one and the gel only sees the small amount of vapor a 38°F dew point leaves behind, and each charge lasts far longer.
Four sizes cover 5, 10, 20 and 30 SCFM at 100 psig. The same housings carry 4 to 25 SCFM at 80 psig and 7 to 43 SCFM at 150 psig, so size from the pressure at the dryer. A 15 micron cleanable dust filter is built in, and each model can be ordered with a coalescing prefilter fitted.
HDF Series Applications
Four inline housings, 4 in wide
All four HDF models are 4 in wide. The HDF1 and HDF2 are 13 and 12 in tall, weigh 13 and 15 lb and take 1/4 in ports; the HDF3 and HDF4 are 20 and 28 in tall at 20 and 23 lb on 1/2 in ports. The charges are 1, 2, 4 and 6 lb of silica gel, replaced with kits HSG1 through HSG4.
Mount it inline at the drop to the gun or tool, with a ball valve ahead of it so the charge can be changed without bleeding the whole line. Keep the gel away from liquid water: a drop leg and drain upstream, or the -F version with its coalescer, stops the condensate slugs that would spoil a charge in minutes. Put the housing where the operator can see the gel color without moving anything.
Common FAQs
It can dry that air, but drying is not what makes air safe to breathe. Silica gel does nothing about carbon monoxide, oil vapor or odor, so a supplied-air respirator line needs it's own breathing-air treatment and carbon monoxide alarm to reach Grade D quality, whatever dryer sits ahead of it. Use the HDF on the gun line, where the finish needs dry air, and keep the respirator supply on purpose-built breathing-air equipment. Label the two outlets differently so a gun hose is never plugged into the hood supply.
Almost always because liquid water reached it, not vapor. A slug of condensate from an undrained receiver, a low point in the drop or a refrigerated dryer whose drain has failed saturates the inlet end at once, and liquid water also cracks silica gel beads into fragments that load the dust filter. Look at the spent charge: a sharp white band with broken beads at the inlet confirms liquid, while a color front that has simply run the full length of the column points to a heavy vapor load the plant dryer should have removed. Find and fix the failed drain before loading the next kit.
