Van Air Systems FD400-FD1600 blast-pak - Manual (Page 2)

PAGE 2
A Blast Pak is a skid mounted system consisting of an air-cooled trim cooler, a single tower dryer with a bed of desiccant tablets and a coarse
afterfilter. Wet warm air enters the trim cooler where it is cooled to a temperature approaching ambient. Water is condensed out during this
cooling process. The saturated air and the liquid water proceed to the inlet of the single tower dryer. The liquid water and any solid particles
present are separated by gravity and fall to the dryer sump area. The process air moves upward through the bed of desiccant tablets which
attract and absorb moisture from the air before it flows through the dryer outlet. The tablets dissolve gradually as they absorb the moisture.
The solution, which consists of dissolved desiccant and water, falls into the sump area at the bottom of the vessel. The dryer must be
drained periodically to remove the accumulated solution. A manual ball valve is supplied for this purpose. A pneumatic drain valve is
available as optional equipment for automatic draining. Likewise, the desiccant in the dryer must be periodically replenished to maintain
performance. The coarse afterfilter is supplied to catch any residuals that may work their way downstream.
SECTION 1 DESCRIPTION OF OPERATION
2.1 INLET CONDITIONS
The Blast Paks are rated as follows: 400 SCFM (FD400), 800 SCFM (FD800), 1200 SCFM (FD1200) and 1600 SCFM (FD1600) respectively
at 100 PSIG, 180° F into the trim cooler (sized for 90° F ambient and 10° approach). Approach temperatures will vary with changes to the inlet
conditions (flow, pressure, temperature) and the ambient temperature. The dew point out of the dryer tower is directly related to the inlet
temperature entering the dryer vessel. The lower the inlet temperature, the lower the dew point of the outlet air.
The aftercooler maximum inlet temperature is 250° F. When using DRY-O-LITE desiccant, the inlet temperature to the dryer tower should not
exceed 100° F.
SECTION 2 PERFORMANCE
2.2 MAXIMUM CAPACITIES FOR DRYER - SCFM (Nm 3 /hr)
MODEL
FD-400
FD-800
FD-1200
FD-1600
MAXIMUM
WORKING
PRESSURE
200 PSIG
13.8 Bar
200 PSIG
13.8 Bar
200 PSIG
13.8 Bar
175 PSIG
12.1 Bar
100 PSIG
6.9 Bar
400
643
800
1286
1200
1929
1600
2572
125 PSIG
8.6 Bar
487
783
974
1567
1462
2350
1949
3133
150 PSIG
10.3 Bar
574
923
1149
1847
1723
2770
2297
3694
60 PSIG
4.1 Bar
261
419
521
838
782
1256
1042
1675
80 PSIG
5.5 Bar
330
531
661
1062
991
1593
1321
2124
SECTION 4 OPERATION
175 PSIG
12.1 Bar
662
1064
1323
2127
1985
3191
2646
4254
200 PSIG
13.8 Bar
749
1204
1497
2408
2246
3611
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3.1 PRESSURE RELIEF VALVE
A 2" NPT coupling is provided on the back of the dryer vessel for
installing the relief valve. A pressure relief valve should be installed to
conform to OSHA safety standards. Refer to OSHA Standard Section
1910.169, paragraph “b”, subparagraph “3” and any other federal, state
or local codes concerning pressure vessels.
See section 6 for recommended relief valves (available from your Van
Air rep.)
3.4 HIGH LEVEL ALARM (P/N 26-3667)
A 3/4"NPT connection is provided, on the FD800 through FD-
1600, for installing a HLA-120 High Level Alarm to alert personnel
that the drain solution in the dryer has reached an unacceptable
level. Ask your local Van Air representative for details.
3.2 PNEUMATIC DRAIN VALVE (P/N 39-0284)
The 1"NPT drain connection can be fitted with a PDV-500T pneumatic
drain valve for automatic draining of the vessel. Ask your local Van Air
representative for details.
SECTION 3 OPTIONS
4.1 DESICCANT INSTALLATION
IMPORTANT
The Blast Pak is shipped WITHOUT the desiccant installed.
The desiccant MUST BE INSTALLED before using the
system.
THE USE OF CHEMICALS OTHER THAN VAN AIR
DESICCANT WILL VOID THE WARRANTY ON THE DRYER.
4.2 LUBRICATOR OIL
Check oil level in lubricator regularly and add oil as required.
IMPORTANT
The Blast Pak is shipped WITHOUT the lubricator oil
installed. The lubricator oil MUST BE INSTALLED before
using the system.
4.3 START UP PROCEDURES
SLOWLY pressurize the air system. Allow some air to bleed
through the manual drain valve. Once the system starts to
pressurize, the manual drain valve can be closed. The Blast Pak
is now in operation.
CAUTION
Make sure that the Blast Pak is not subjected to sudden
flow surges. Always open the valves slowly to permit
gradual equalization of pressure between the Blast Pak
and the air supply lines.
The procedure for filling the dryer with desiccant is outlined in
Section 5.6 of this manual.
3.3 GAUGE KITS
A 1/2" NPT coupling is provided on the lower front of the dryer for
installing gauges.
See Section 6 for optional gauge kits (available from your Van Air
rep.)