Van Air Systems HLSXG-55 - Manual (Page 10)

PAGE 10
SHUTDOWN PROCEDURES SECTION 7
Close the inlet and outlet isolation valves.
Allow the dryer to cycle unitl it depressurizes completely.
Turn OFF the power to the dryer.
If maintenance is to be performed on the dryer, make sure the dryer is
completely depressurized. Tower pressure gauges must read
0 PSIG before removing any item on the dryer.
MAINTENANCE SECTION 8
8.1 DAILY INSPECTION
The following procedures should be performed daily:
• Check the dryer operating conditions: inlet temperature, ambient
temperature, and inlet pressure.
• Monitor the dryer for one complete cycle to make sure it is
operating properly.
• Inspect all upstream equipment, aftercoolers, separators, drains
and filters.
• Check the pressure differential indicator on all prefilters and
afterfilters. If the differential pressure is unacceptable, replace the
elements.
• Check the prefilter for proper draining. The prefilter must be
drained manually.
• Make sure that all bypass valves are tightly closed.
• Visually check the dryer and piping for damage.
• Visually check the dryer moisture indicato (blue dry or pink wet).
8.2 SCHEDULED MAINTENANCE
12 MONTHS
• Replace the control gas filter element
• Replace the pre-filter and after-filter elements
24-60 MONTHS
• The desiccant in the towers should be replaced every two to five
years. The life of the desiccant will vary depending on the inlet gas
conditions. Systems with excessive contaminants and/or
inadequate filtration will decrease the life span of the desiccant
drastically. Once the desiccant is contaminated with lubricants, it
must be replaced.
Remove all oil, dirt, or scale from the towers and inlet piping. Do
NOT weld, grind or sandblast the vessels as this voids the ASME
Certification. The vessels may be steam cleaned internally and
externally to remove dirt and oil.
CAUTION
Make sure that the towers are clean to prevent contamination of
new desiccant.
Replace plugs securely on desiccant drain ports. Apply pipe thread
sealant as necessary.
Make sure that the drain plugs are installed before attempting to fill the
towers. Load desiccant through the desiccant fill ports. REFER TO
SECTION 3.2 FOR PROPER DESICCANT AMOUNTS.
Reinstall the fill port plugs. Apply pipe thread sealant as necessary.
Follow START UP PROCEDURES IN SECTION 5.1 to start up and place
dryer in operation.
8.3 DESICCANT REPLACEMENT
WARNING
DO NOT ATTEMPT TO REMOVE FILL/DRAIN PLUGS UNTIL ALL
GAS PRESSURE IS OUT OF THE VESSEL. CHECK ALL TOWER
PRESSURE GAUGES, MAKING SURE THAT THEY ARE AT 0
PSIG AND INCOMING PRESSURE HAS BEEN TURNED OFF.
ALWAYS WEAR EYE PROTECTION AND GLOVES WHEN
HANDLING THE DESICCANT. DESICCANT DUST MAY CAUSE
EYE AND SKIN IRRITATION. AVOID BREATHING THE DUST
AND PROLONGED CONTACT WITH THE SKIN.
FIRST AID IN CASE OF EYE CONTACT, IMMEDIATELY FLUSH
EYES WITH PLENTY OF WATER FOR AT LEAST 15 MINUTES.
CONSULT A PHYSICIAN.
Take dryer off stream following the SHUTDOWN PROCEDURES IN
SECTION 7.
Remove the plugs from the desiccant drain and fill ports; drain old
desiccant from each tower.
8.4 CONTROL GAS FILTER ELEMENT REPLACEMENT
Shutdown the dryer per SECTION 7.
Turn manual ball valve on bottom of control gas filter to ensure that the
dryer is completely depressurized.
WARNING
DO NOT REMOVE THE FILTER BOWL FROM HEAD UNTIL
HOUSING IS COMPLETELY DEPRESSURIZED.
After all pressure is out of the dryer, grasp the filter bowl firmly and
push upward while turning it counter-colckwise (as viewed from the
bottom) to remove it from the filter head. If prefered strap wrenches
can be used to remove bowl. Make sure that the bowl does not drop.
Remove the used element from element adaptor in filter head by
pulling down. Discard used element properly.
Remove new element from the shipping package. Check to make sure
that the o-ring is properly positioned in endcap and has been lightly
greased.
Grasp clean element by bottom endcap and push element onto
element adpater firmly, but do not force beyond normal stop.
Check o-ring in filter head. Replace if worn or damaged.
Clean and lubricate threads on bowl with light grease. This will
facilitate removal of bowl at next servicing.
Carefully raise filter bowl over element and screw into head, then
tighten. DO NOT OVERTIGHTEN.
Close manual drain ball valve.
Following the start up procedures in SECTION 5.1 for the dryer, place
the dryer on stream.