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

Start from the general arrangement drawing for the exact model, because skid space is usualy the constraint. The dryer goes after the final-stage aftercooler and separator, ahead of the purification cartridges, with both condenser faces open to moving air. Fill rooms are often heated by the compressor itself, so check that the dryer sits within its 40 to 120°F ambient range on the hottest filling day.

The exchanger tubing wall has to be thicker for the higher class, and the fittings and test pressures rise with it, while the refrigeration circuit is the same size for the same SCFM. So buying 6,000 psig for a 1,000 psig test loop pays for steel the system will never use. The exception is a plant that knows it will raise the system pressure soon, where buying the class once is cheaper than buying the dryer twice.

A high-pressure timed solenoid drain rated at or above the 3,625 psig class, in brass or stainless. Rate it to the system's relief setting, because that is the pressure it will see when something upstream misbehaves. The discharge leaves at full pressure, so pipe it to a collection vessel or separator rather than an open floor drain, where the blast scatters condensate and oil across the room.

Not within its rating. The series is specified for 40 to 120°F ambient, and a refrigerated dryer in a cold room loses control of its circuit while the condensate in its drain and lines starts to freeze. A frozen drain at 5,000 psig means water passing on to the cylinders. Heat the room or the enclosure, or move the dryer to the warm side of the wall with the compressor.