Van Air Systems FD-250 blast-pak - Manual (Page 3)

PAGE 3
5.1 DRAIN VESSEL DAILY
Drain the vessel by opening the drain valve and allowing the solution
to discharge; then close the drain valve completely. The accumulated
solution must be drained after every 4 to 8 hours of operation. An
optional pneumatic drain valve can be installed to drain the vessel
automatically as needed.
SECTION 5 MAINTENANCE
IMPORTANT
The drain solution may contain lubricants. Comply with all
applicable regulations concerning the disposal of these
chemicals.
5.2 CHECK DESICCANT LEVEL BEFORE OPERATION
Look into one of the sight windows. If light can be seen through the
opposite sight window, the desiccant supply must be replenished to
ensure dryer performance.
5.6 ADDING DESICCANT
Loosen the nut on the hatch cover and push on the hatch cover. If
the vessel is depressurized, the cover will unseal. Once the seal is
broken, tilt the hatch cover and remove it from the dryer.
The initial fill of the dryer requires 250 lbs of desiccant.
A 100 lbs of desiccant is required to fill the FD-250 & FD-250-DC from
the sight window to maximum fill level.
Add the desiccant and then level off the tablet bed.
CAUTION
Make sure the desiccant level is below the screen on the
outlet pipe.
Do NOT overfill the vessel. Adequate space must be left
to allow the hatch cover to be installed.
IMPORTANT
The use of other than Van Air desiccant will void the
warranty on the Blast Pak.
WARNING
IF THE SIGHT WINDOWS ARE DAMAGED IN ANY WAY,
THEY MUST BE REPLACED IMMEDIATELY WITH VAN AIR
PART NO. 26-0104 only.
Reference Section 5.6 for refilling instructions and Section 5.7
for estimated consumption rates.
Check the operation of all equipment installed before and after the
Blast Pak.
Inspect the hatch cover for signs of corrosion and/or leaks. Replace
the cover and/or gasket as necessary.
5.3 CHECK OIL LEVEL IN LUBRICATOR (FD-250 only)
Verify that there is sufficient amount of oil in the lubricator and add
oil as needed. Note: 1 quart of oil shipped with the BlastPak. See
section 6 for oil part number.
5.4 CHECK FILTER IN FRL (FD-250 only)
Replace filter as needed. See section 6 for filter part number.
5.5 CLEAN AFTERCOOLER CORE
The core should be cleaned regularly. Accumulation of dirt or other
contaminants such as oils will greatly reduce the efficiency of the
aftercooler.
Normal accumulation of dirt can be removed by blowing the core off
with compressed air. If the core becomes contaminated with oil-
laden particles, it can be steam cleaned. Clean with extreme care
as the aluminum fins can be easily damaged.
Inspect the hatch cover and sealing surface. If there is any damage,
replace the cover. Replace the cover every 5 years regardless of
condition. The gasket should be replaced every time the hatch cover
is removed or at least once a year.
Check the sealing surface of the opening. If it is contaminated with
dirt or rust, it must be cleaned before installing the hatch cover. A
contaminated surface may prevent the gasket from properly sealing.
Install the filler hatch cover and a new gasket. Tighten the nut on the
hatch cover until it is snug. Overtightening can cause damage to the
cover. The cover will seal when the vessel is pressurized.
Start up the dryer following the procedures in Section 4.4.
5.7 ESTIMATING DESICCANT USAGE
The ANNUAL DESICCANT CONSUMPTION RATE table is a guide
to estimate the desiccant usage for your installation.
The consumption rate is an approximation of how much
desiccant will be added over a period of one year.
The figure is an average and may vary depending upon your actual
conditions (i.e. 24 hour operation, higher inlet temperature, excessive
liquid water content, contaminants etc.)
Shut down the air system and open the drain valve to allow the dryer
to depressurize completely.
CAUTION
If the dryer is not drained regularly, it may become
flooded and the accumulated liquid may enter the air
system and cause damage to downstream equipment.
4.4-B REFILLING THE DRYER WITH DESICCANT
During the drying process, the desiccant tablets dissolve slowly.
The desiccant consumption rate is dependent on several factors,
such as inlet temperature, flow and pressure. To check the level
of the desiccant bed, look into one of the sight windows. If light can
be seen through the opposite sight window, the desiccant supply
must be replenished to ensure dryer performance.
The dryer may require draining on a more frequent basis on
humid days. If a pneumatic drain valve is installed on the
dryer, it will drain automatically as needed.
4.4-A DAILY DRAINING
The accumulated desiccant and water solution in the bottom
of the dryer should be drained frequently. If a manual drain
valve is installed on the dryer, it must be opened at least
once every 4 to 8 hours to drain the dryer.
4.4 OPERATION
The simple design of the single tower dryer allows for easy
operation. The dryer requires two procedures to ensure peak
performance.
The desiccant bed level should be maintained to at least the sight
window level at all times to ensure optimum drying capabilities.
To use the chart, first determine the SCFM that is being processed
through the Blast Pak. Then locate the nearest flow rate listed on
the chart and interpolate as needed.