Sullair DEX Series, Руководство пользователя и обслуживания

Страница: 37 / 48

Section 7
37
DEX HEATED REGENERATIVE DRYER
SYSTEM MAINTENANCE
7.1 WITH YOUR DRYER ONLINE
The following points must be verified at regular
intervals
• Daily, verify the regeneration heater outlet
temperature is correct and conforms to that
listed in
Section 3.7 .
• Daily, verify the prefilter automatic drain is
functional.
• Once a week, verify the operating
sequence at vessel change over with that
previously described in
Section 5.4 and
Section 5.5 ,
• Once a week, verify the adsorption, regen-
eration heating, cooling and vessel change
over times compared to that listed in
Section 3.7
• Weekly, check the dryer, prefilter and after-
filter for excessive pressure drop.
7.2 MONTHLY INSPECTIONS
• Verify the system is leak free.
• Verify the current draw of the regeneration
heater.
• Verify the operation of all pressure gauges,
temperature gauges, temperature switches
and the dewpoint indicator.
7.3 QUARTERLY INSPECTIONS
• Repeat all monthly inspections.
• Check the prefilter and afterfilter elements
for correct installation and excess dirt.
• Check for tightness of flange bolting espe-
cially where high temperatures occur.
7.4 YEARLY INSPECTIONS
• Replace seats and shaft seals on all butter-
fly valves.
• Replace seats and shaft seals on all ball
valves.
• Dismantle the double acting pneumatic
actuators. Inspect internal components for
visual signs of wear and replace parts as
necessary.
• Dismantle and inspect solenoid valve inter-
nal components for visual signs of wear.
Replace parts as necessary.
• Check the function of all temperature con-
trols.
7.5 DESICCANT CHANGE OUT
Depending on the air quality and service conditions,
the desiccant will last 4 to 5 years. Experience has
shown that the period may be even longer.
To change the desiccant, ensure the system is out of
service, locked out and de-pressurized. Remove the
plug from the desiccant drain ports to allow the
desiccant to fall from the vessel. At the end of this
procedure re-install the plug.
To load the new desiccant the plug on the fill ports on
the top head should be removed. Then install the
amount and type of desiccant listed in
Section 3.3.1
in each vessel. Re-install the covers on the desiccant
fill ports.
Prior to placing the dryer in service all plugs and
flanges that were removed should be leak tested. If
any leaks occur they should be repaired and re
tested prior to placing the dryer in service.
7.6 FILTER ELEMENT CHANGE
OUT
The prefilter and afterfilter elements should be
replaced when the following guidelines are
exceeded.
• The differential pressure exceeds 5 PSIG.
• The operating service exceeds 4,500
hours.
• A period of one year is exceeded.