12
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Dresser Roots
Operation
Before operating a blower under power for the first time,
recheck the unit and the installation thoroughly to reduce the
likelihood of troubles. Use the following procedure check list
as a guide, but consider any other special conditions in the
installation.
1.
Be certain
that no bolts, tools, rags or dirt have been
left in the blower air chamber.
2.
Be certain
that inlet piping is free of any debris. Use
of the temporary protective screen at the blower inlet
as described under INSTALLATION is strongly recom-
mended during early operation. If an outdoor intake
without filter in used, be sure the opening is clean and
protected by a strong screen.
3.
Check
blower leveling, drive alignment, belt tension and
tightness of all mounting bolts if installation is not recent.
4. Turn drive shaft over by hand to make sure impellers will
rotate without bumping or rubbing at any point.
5.
Check
the blower lubrication system. Oil level should be
at the center of the sight glasses.
6.
Make sure
driver (and gear unit if supplied) are properly
lubricated. Check that power is available and that all
electrical overload and safety controls installed, con-
nected and in operating condition.
7. Open the manual unloading valve in the inlet air line,
and make sure that any blocking valve in the discharge
piping is open.
8. Bump blower a few revolutions with driver to check
direction of rotation and to see that both units coast
freely to a stop.
9. Start blower, let it accelerate to full speed, then shut off.
Listen for any knocking sounds, both with power on and
also as it slows down.
10. If no problems have appeared, restart unit and operate
for 5 to 10 minutes under no-load conditions as para-
graph 7. Check the cylinder surfaces all over by feeling
to locate any hot spots indicating impeller rubs. Continue
to listen for noises and watch for changes in vibration. If
all conditions are acceptable, proceed as follows:
11. Continue operating, but gradually close the inlet unload-
ing valve to establish normal operating conditions as
closely as possible. It is recommended that pressure and
vacuum gages and good thermometers be used in both
inlet and discharge locations to permit determination of
pressure rise and temperature rise across the blower.
Observe the vacuum increase as the unloading valve is
closed, and do not allow it to exceed the rating of the
specific blower as listed under LIMITATIONS.
12. All conditions being satisfactory to this point, continue
the run for about one hour. Observe the vacuum and
temperature rise periodically to make sure neither
exceeds specified limits. Continue to check for
noises and hot spots, and observe oil level behavior
at the three sumps. If trouble appears, refer to the
TROUBLESHOOTING CHECKLIST for suggested
remedies.
The unit should now be ready for continuous duty under full
load. During the first several days, make periodic checks
to be sure that all conditions remain reasonably steady and
within limits. These checks may be especially important if the
unit is part of a process system where conditions may vary.
At the first opportunity, stop the blower and clean or remove
the protective inlet screen. At the same time, verify leveling,
coupling alignment or belt tension, and anchor bolt tightness.
Should operation of an air blower prove that its capacity is a
little too high for actual requirements, a
small
excess may be
blown off through the manual unloading or vent valve.
Never
rely on the pressure relief valve as an automatic vent.
Such use may cause the inlet vacuum to become excessive,
and can also result in failure of the valve itself. If blower capac-
ity is low, refer to TROUBLESHOOTING CHECKLIST before
contacting the nearest Sales Office for recommendations. Be
prepared to give all operating conditions and requirements.
Safety Precautions
For equipment covered specifically or indirectly in
this instruction book, it is important that all personnel
observe safety precautions to minimize the chances
of injury. Among many considerations, the following
should particularly be noted:
•
Blower casing and associated piping or accesso
-
ries may become hot enough to cause major skin
burns on contact.
•
Internal and external rotating parts of the blower
and driving equipment can produce serious physi-
cal injuries. Do not reach into any opening in the
blower while it is operating, or while subject to
accidental starting. Cover external moving parts
with adequate guards.
•
Disconnect power before doing any work, and
avoid by-passing or rendering inoperative any
safety or protective devices.
•
If blower is operated with piping disconnected,
place a strong coarse screen over the inlet and
avoid standing in the discharge air stream.
•
Stay clear of open inlet piping (suction area) of
pressure blowers, and the open discharge blast
from vacuum blowers.
•
Stay clear of the blast from pressure relief valves
and the suction area of vacuum relief valves.
•
Avoid extended exposure in close proximity to
machinery which exceeds safe noise levels.
Summary of Contents for Roots DVJ WHISPAIR
Page 22: ...DVJ WHISPAIR Dry Exhauster 23 Figure 15 Assembly of 10 thru 12 DVJ V V Belt Drive Splash Lube ...
Page 23: ...24 Dresser Roots Figure 16 Sectional Assembly of 10 thru 14 DVJ V Blowers ...
Page 24: ...DVJ WHISPAIR Dry Exhauster 25 Figure 17 Sectional Assembly of 16 20 DVJ Common Lube ...
Page 25: ...26 Dresser Roots Figure 18 Sectional Assembly of 1016 DVJ V Units ...
