SPX Flow SPX Flow Pressure-Swing Desiccant Type Compressed Air Dryers with AccuShift Switching Valves HHL-260HP HHL-260HP

Purge mufflers checked regularly

Muffler disseminator elements changed annually

Muffler disseminator elements clogged with desiccant dust

Process and pilot valves checked frequently for leaks and proper operation

Purge pressure adjustment valve checked frequently for proper adjustment

Sign off on the air dryer check

NOTE: The use of the correct replacement desiccant is necessary for proper dryer operation. Never use hygroscopic salts of the type commonly used in “deliquescent ” type dryers.

Can the required dew point be maintained while the dryer is being operated within its design conditions and there are no mechanical malfunctions?

NOTE: Desiccant life is determined by the quality of the inlet air. Proper filtering of the inlet air will extend the life of the desiccant. Typically desiccant life is 3 to 5 years.

Dryer de-pressurized and de-energized?

Fill and drain plugs from desiccant tower removed and spent desiccant drained?

NOTE: Use extreme care when inserting rods or other tools through the desiccant fill or drain ports to loosen packed desiccant. Internal flow diffusers at the ends of the desiccant beds can be damaged or punctured by sharp instruments. These diffusers are necessary to distribute the airflow and keep the desiccant beads within the tower. Desiccant beads in exhaust mufflers, afterfilters, or the piping connected to the desiccant towers may indicate a perforation of a diffuser.

Drain plug replaced using Teflon tape or another pipe thread sealant suitable for compressed air service?

Desiccant tower filled as full as possible with dry desiccant?

Fill plug replaced using Teflon tape or another pipe thread sealant suitable for compressed air service?

WARNING! The pilot air filter housing is a pressure-containing device, depressurize before servicing.

Enter the current pilot air pressure

Is the pilot air pressure in the range of 60-120 psig (4.1-8.3 barg)?

Slowly open manual drain valve on bottom of filter bowl by turning clockwise to verify that the housing is depressurized before removing bowl.

Is the dryer isolated from air supply?

Is the dryer fully depressurized?