Ultra-High Pressure Refrigerated Air Dryers to 6,000 psig

One series, four pressure classes, eight flow sizes from 20 to 275 SCFM

Above 725 psig the compressed air world changes: multi-stage piston compressors, storage banks of steel cylinders, 1/2 in tube and fittings rated in thousands of psi, and flows measured in tens of SCFM rather than hundreds. Breathing-air fill stations, hydrostatic and pneumatic test stands, gas-charging benches and high-pressure storage all need the water out before it reaches a cylinder or a valve seat, and this series is the refrigerated dryer built for that pressure.

The series is a matrix: four pressure classes of 1,200, 3,625, 5,000 and 6,000 psig, each in eight flow sizes of 20, 30, 40, 60, 100, 125, 200 and 275 SCFM, giving 32 models. Every one carries a stainless steel tube-in-tube heat exchanger with all-stainless air-side components, 1/2 in NPT connections, and a hermetic refrigeration circuit delivering a 38°F pressure dew point at rated flow.

Sizes to 100 SCFM run on 115 V single phase, 125 SCFM on 230 V, and 200 and 275 SCFM on 460 V three phase, absorbing 0.3 to 2.5 kW. A general arrangement drawing exists for every model, which matters when the dryer must fit a fill-station skid or a test-cell wall.

1,200, 3,625, 5,000 and 6,000 psig maximum working pressure by model
20 to 275 SCFM in eight sizes within each pressure class
Stainless tube-in-tube exchanger, all-stainless air path, 1/2 in NPT
38°F pressure dew point; 40 to 120°F inlet and ambient range

AXHP Series refrigerated air dryer, three-quarter view

All 32 ultra-high-pressure models

Flow is rated at 100 psig reference conditions and 100°F inlet; the last figure in the part number is the pressure class in psig. Every model links to its own specification page.

PART NUMBER	SERIES	SCFM	CONNECTION	VOLTAGE	STATUS
AXHP-20-1200	AXHP Series	20	1/2 in NPT	115/1/60	Current
AXHP-20-3625	AXHP Series	20	1/2 in NPT	115/1/60	Current
AXHP-20-5000	AXHP Series	20	1/2 in NPT	115/1/60	Current
AXHP-20-6000	AXHP Series	20	1/2 in NPT	115/1/60	Current
AXHP-30-1200	AXHP Series	30	1/2 in NPT	115/1/60	Current
AXHP-30-3625	AXHP Series	30	1/2 in NPT	115/1/60	Current
AXHP-30-5000	AXHP Series	30	1/2 in NPT	115/1/60	Current
AXHP-30-6000	AXHP Series	30	1/2 in NPT	115/1/60	Current
AXHP-40-1200	AXHP Series	40	1/2 in NPT	115/1/60	Current
AXHP-40-3625	AXHP Series	40	1/2 in NPT	115/1/60	Current
AXHP-40-5000	AXHP Series	40	1/2 in NPT	115/1/60	Current
AXHP-40-6000	AXHP Series	40	1/2 in NPT	115/1/60	Current
AXHP-60-1200	AXHP Series	60	1/2 in NPT	115/1/60	Current
AXHP-60-3625	AXHP Series	60	1/2 in NPT	115/1/60	Current
AXHP-60-5000	AXHP Series	60	1/2 in NPT	115/1/60	Current
AXHP-60-6000	AXHP Series	60	1/2 in NPT	115/1/60	Current
AXHP-100-1200	AXHP Series	100	1/2 in NPT	115/1/60	Current
AXHP-100-3625	AXHP Series	100	1/2 in NPT	115/1/60	Current
AXHP-100-5000	AXHP Series	100	1/2 in NPT	115/1/60	Current
AXHP-100-6000	AXHP Series	100	1/2 in NPT	115/1/60	Current
AXHP-125-1200	AXHP Series	125	1/2 in NPT	230/1/60	Current
AXHP-125-3625	AXHP Series	125	1/2 in NPT	230/1/60	Current
AXHP-125-5000	AXHP Series	125	1/2 in NPT	230/1/60	Current
AXHP-125-6000	AXHP Series	125	1/2 in NPT	230/1/60	Current
AXHP-200-1200	AXHP Series	200	1/2 in NPT	460/3/60	Current
AXHP-200-3625	AXHP Series	200	1/2 in NPT	460/3/60	Current
AXHP-200-5000	AXHP Series	200	1/2 in NPT	460/3/60	Current
AXHP-200-6000	AXHP Series	200	1/2 in NPT	460/3/60	Current
AXHP-275-1200	AXHP Series	275	1/2 in NPT	460/3/60	Current
AXHP-275-3625	AXHP Series	275	1/2 in NPT	460/3/60	Current
AXHP-275-5000	AXHP Series	275	1/2 in NPT	460/3/60	Current
AXHP-275-6000	AXHP Series	275	1/2 in NPT	460/3/60	Current

The ultra-high-pressure series

AXHP Series:

32 models here: 20 to 275 SCFM

20 to 275 SCFM
Ultra-High Pressure
6,000 psig max inlet

SERIES DETAILS

Picking the pressure class

Select the class above the system's maximum working pressure, not its normal pressure. A breathing-air station filling 4,500 psig cylinders runs its compressor to 5,000 psig or more and takes the 5,000 or 6,000 class; a 3,000 psig storage bank takes the 3,625 class; a 1,000 psig test loop takes the 1,200 class. Within the class, pick the flow size at or above the compressor's delivery: a 15 hp four-stage compressor makes 25 to 35 SCFM, so it takes the 40 SCFM model, and a 40 hp machine at 100 SCFM takes the 100 or 125. The higher classes cost more for the same flow because the exchanger tubing is thicker, so do not buy 6,000 psig for a 1,200 psig system.

Why SCFM is small and volume is smaller

At 5,000 psig a flow of 100 SCFM is less than 0.3 actual cubic feet per minute, so the exchanger is a coil of small-bore stainless tube rather than a plate block, and the whole dryer weighs less than a plant-air dryer of a tenth the pressure. The water content of the air is small too, because most of it condensed in the compressor's interstage coolers, but what remains will freeze in a 4,500 psig regulator or corrode a cylinder valve if it is not removed.

Installation at high pressure

Pipe the dryer after the final-stage aftercooler and separator with the same tube, fittings and pressure rating as the rest of the system, and fit the drain with a high-pressure timed drain rated for the class; the drains page lists 600 to 6,000 psig versions in brass and stainless. Put a high-pressure particulate and coalescing filter after the dryer, and keep the dryer's own 40 to 120°F ambient range in mind in a fill-station room that shares its heat with the compressor. Give the condenser clear air on both faces.

What a refrigerated dryer does and does not do

At 38°F pressure dew point the air is dry enough for storage, test and charging duty and for the first stage of a breathing-air purifier train. It is not, on its own, breathing air: a fill station still needs its purification cartridges for oil vapor, carbon monoxide and the final dew point, and those cartridges last far longer when a refrigerated dryer has already taken the bulk water out ahead of them. Systems that need a dew point below freezing at pressure move to desiccant; the refrigerated versus desiccant page draws the line.

Ultra-high-pressure dryer questions

The pressure class in psig: 1200, 3625, 5000 or 6000. The number before it is the flow size in SCFM, so a model ending in 60-3625 is a 60 SCFM dryer rated for 3,625 psig.

Only the higher class covers both, and then only at the flow it is rated for. A dryer is never installed on a system whose relief setting exceeds the dryer's class, so a shared dryer is a 5,000 or 6,000 psig unit.

Less than a plant-air dryer per SCFM, because the compressor's interstage and final coolers have already condensed most of it, but enough to matter. At 5,000 psig even a few grains of water per pound of air will freeze at a regulator or corrode a cylinder valve, and the dryer takes the air to a 38°F pressure dew point.

The air side is all stainless steel, which suits nitrogen and other dry inert gases at the same pressure. State the gas and its composition with the inquiry so the exchanger and seals can be confirmed for it.

460 V three phase and about 2.5 kW. The 20 to 100 SCFM sizes are 115 V single-phase units drawing 0.3 to 1.1 kW, and the 125 SCFM size is 230 V single phase.

1-805-484-2992

Ultra-High Pressure Refrigerated Air Dryers to 6,000 psig