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Quotes - Engineering - SalesThe HBP Series, 13 sizes
From a 2 in NPT dryer to a 6 in flanged one
The HBP Series starts at 500 SCFM on 2 in NPT, 105 in tall and 1,866 lb, and ends at 4,300 SCFM on 6 in flanges at 12,350 lb. Each model is published with blower kW, heater kW and full-load average kW, plus its matched coalescing prefilter and afterfilter, so the electrical design and the filtration can be settled before the order is placed.
Tower switching runs on a fixed timer as standard. The demand option keeps the drying tower on line until it is actually loaded, which on a plant running well under its rating stretches the cycle and cuts the number of heating periods. The NEMA 4 controller shows tower status and reminds the crew when service is due.
Options are vessel insulation, which keeps heat in the regenerating tower and matters in a cool equipment room, and pre and after filters mounted on the dryer.
Regeneration without spending dried air
An axial blower and a heater do the job purge air does elsewhere
While one tower dries, a dedicated axial blower pulls ambient air across an external heater and drives it through the off-line tower, carrying the adsorbed water out of the alumina and venting it. At design conditions none of the compressed air is used for regeneration, so the dryer's full rating reaches the header. The price of that is electricity, and the figures for every model are published so it can be counted before purchase.
Dew point
- -40°F, ISO class 2
- Fixed-time tower switching
- Demand switching optional
Limits
- 150 psig maximum, 60 minimum
- Inlet 40 to 120°F
- 5 psi pressure drop
Power
- Blower 1.6 to 10.3 kW
- Heater 10 to 70 kW
- Full-load average 10 to 70 kW
Build
- NEMA 4 controller
- Soft-seated check valves
- Tower status and service reminders
Blower purge models with blower, heater and average kW
Rated at 100 psig and 100°F inlet. The heater column sets the size of the electrical service; the full-load average is what the meter will show over a cycle with the plant at rated flow.
| MODEL | SERIES | SCFM | CONNECTION | H X W X D (IN) | WEIGHT (LB) |
| HBP500 | HBP Series | 500 | 2 in NPT | 105 x 53 x 70 | 1,866 |
| HBP600 | HBP Series | 600 | 2 in NPT | 108 x 55 x 71 | 2,111 |
| HBP750 | HBP Series | 750 | 3 in flange | 114 x 60 x 83 | 2,456 |
| HBP900 | HBP Series | 900 | 3 in flange | 114 x 60 x 83 | 2,472 |
| HBP1050 | HBP Series | 1,050 | 3 in flange | 113 x 64 x 84 | 2,981 |
| HBP1300 | HBP Series | 1,300 | 3 in flange | 118 x 66 x 85 | 3,576 |
| HBP1500 | HBP Series | 1,500 | 3 in flange | 116 x 80 x 93 | 5,359 |
| HBP1800 | HBP Series | 1,800 | 3 in flange | 116 x 80 x 93 | 5,359 |
| HBP2200 | HBP Series | 2,200 | 4 in flange | 124 x 85 x 104 | 8,018 |
| HBP2600 | HBP Series | 2,600 | 4 in flange | 124 x 85 x 104 | 8,123 |
| HBP3200 | HBP Series | 3,200 | 6 in flange | 121 x 97 x 117 | 9,333 |
| HBP3600 | HBP Series | 3,600 | 6 in flange | 128 x 97 x 117 | 9,833 |
| HBP4300 | HBP Series | 4,300 | 6 in flange | 124 x 105 x 130 | 12,350 |
Electricity against compressed air
Compare blower purge with heatless at 1,500 SCFM. A heatless dryer of that size gives up roughly 15 percent of its rating as purge, which is a sizable compressor running only to feed regeneration. The blower purge model at the same rating averages 32 kW at full load and returns all of that air to the plant. At this scale the arithmetic usually favors blower purge, and the gap widens with every shift the plant runs.
Planning the electrical service
Heater ratings climb from 10 kW on the smallest model to 70 kW on the largest, with the blower on top of that. Size the feeder on heater plus blower, not on the average, and keep the dryer off any circuit that is shed during a demand-limiting event. A tripped heater leaves a tower wet, and the next switchover sends that moisture downstream.
Ambient air is the regeneration medium
Because the blower draws room air, the equiptment room matters. The rating covers 40 to 120°F ambient, and humid intake air leaves more water behind in the bed it is meant to regenerate. Site the dryer where the intake draws cool, dry air, keep it clear of compressor exhaust, and fit the insulation option where the room runs cool.
Where blower purge belongs
Large central plants with steady demand: multiple-compressor rooms, pharmaceutical utilities and extrusion plants where air runs around the clock and every SCFM saved lets a compressor stay off. Below 500 SCFM the heater and blower are hard to justify, and a heatless or heated purge dryer is the better buy.
What a blower purge dryer asks of the plant
Because the regenerated bed went on line before it had cooled. Hot alumina holds water poorly, so a warm tower passes both heat and moisture for the first minutes of its drying period, and a dew point monitor shows a spike at every changeover. The sequence has to finish cooling the bed, and a hot room or a blower drawing warm air from beside the compressors leaves that step short. Check the room against the 40 to 120°F rating, move the blower intake to cooler air, and consider demand switching, which gives each tower longer to recover at partial load.
A little more than a heatless dryer needs, all of it on the regeneration side. Keep the blower intake clear, since a starved blower pushes less air through the hot bed; confirm the heater reaches temperature on each regeneration; and inspect the insulation, if fitted, for damage that lets heat escape. The soft-seated check valves wear with use and belong in the planned service. The controller's service reminders keep the dates, but the outlet dew point record is the real test of a healthy regeneration.
With a bypass and a plan for the dew point during the outage. Isolation valves and a bypass around the dryer and its filters let the plant run on refrigerated air, which is acceptable for a day or two only if no line gets colder than about 38°F and no process holds a written class. Where one does, a second dryer is needed: two smaller units in parallel, each able to carry the critical load, or a heatless dryer kept as standby. Schedule desiccant changes for warm weather, when refrigerated air on the outdoor lines will not freeze.
