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Some oil seal leakage will occur since an oil film under
<br />the seal lip is required for proper operation. Periodically,
<br />the leaked oil should bu- wiped off from the blower as well
<br />as the baseplate surfaces since even a small amount of hot
<br />leaked oil spreads over a larger area making the leakage
<br />look worse than it actually is.
<br />Before operating a blower under power for the first time,
<br />recheck the unit and the installation thoroughly to reduce
<br />the likelihood of avoidable troubles. Use the following pro-
<br />cedure list as a guide, but consider any other special condi-
<br />tions in the installation.
<br />1. Be certain that no bolts, tools, rags or dirt have been
<br />left in the blower air chamber.
<br />2. Be certain that inlet piping is free of any debris. If an
<br />outdoor intake without filter is used, be sure the open-
<br />ing is located so it cannot pick up dirt and is protected
<br />by a strong screen or grille. Use of the temporary pro-
<br />tective screen at the blower as described under IN-
<br />STALLATION is strongly recommended.
<br />a . Recheck blower leveling, drive alignment and tightness
<br />of all mounting bolts if installation is not recent. If belt
<br />drive is used, adjust belt tension correctly.
<br />4. Turn drive shaft by hand to make sure impellers still
<br />rotate without bumping or rubbing at any point.
<br />5. Make sure oil levels in the main oil sumps are correct.
<br />6, Check lubrication of driver. If it is an electric motor, be
<br />sure that power is available and that electrical overload
<br />devices are installed and workable.
<br />7. Open the manual unloading valve in the discharge air
<br />line. If a valve is in the inlet piping, be sure it is open.
<br />8. Bump blower a few reuolutionswith driver to check that
<br />direction of rotation agrees with arrow near blower
<br />shaft, and that both units coast freely to a stop.
<br />After the preceding points are cleared, blower is ready
<br />for trial operation under "no-load" conditions as set up
<br />under Item 7. The following procedure is suggested to cover
<br />this initial operation test period,
<br />a. Start blower, let it accelerate- to full speed, then shut
<br />off. Listen for knocking sounds, both with power on
<br />and as speed slows down.
<br />b. Repeat above, but let blower run 2 or 3 minutes. Check
<br />for noises, and overall vibration levels of 1.0 in/sec.
<br />maximum.
<br />c. Operate blower for about 10 minutes unloaded. Check
<br />oil levels. Feel cylinder and headplate surfaces for
<br />development of spots too hot to touch, indicating im-
<br />peller rubs. Be aware of any noticeable Increase in
<br />vibration.
<br />Assuming that all trials have been satisfactory, or that
<br />necessary corrections have been made, the blower should
<br />now have a final check run of at least one hour under normal
<br />operating conditions. After blower is restarted, gradually
<br />close the discharge unloading valve to apply working
<br />pressure. At this point it is recommended that a good
<br />pressure gauge or manometer be connected into the
<br />discharge line if not already provided, and that ther-
<br />mometers be in both inlet and discharge lines. Readings
<br />from these instruments will show whether pressure or
<br />temperature ratings of the blower are being exceeded.
<br />During the final run, check operating conditions frequently
<br />and observe the oil levels at reasonable intervals. If excessive
<br />noise or local heating develops, shut down immediately and
<br />determine the cause. If either pressure rise or temperature
<br />rise across the blower exceeds the limit specified in this
<br />manual, shut down and investigate conditions in the piping
<br />system or in the process to which air is being supplied. Refer
<br />to the TROUBLE SHOOTING CHECKLIST for suggestions
<br />on various problems that may appear.
<br />The blower should now be ready for continuous duty
<br />operation at full load. During the first few days make
<br />periodic checks to determine whether all conditions remain
<br />steady, or at least acceptable. This may be particularly im-
<br />portant if the blower is supplying air to a process system
<br />where conditions can vary. At the first opportunity, stop
<br />the blower and clean the temporary inlet protective screen.
<br />If no appreciable amount of debris has collected, the screen
<br />may be removed. See comments under INSTALLATION.
<br />At this same time, verify leveling, coupling alignment or
<br />belt tension, and mounting bolt tightness.
<br />Should operating experience prove that blower capacity
<br />is a little too high for the actual air requirements, a small
<br />excess may be blown off continuously through the manual
<br />unloading or vent valve. Never rely on the pressure relief
<br />valve as an automatic vent. Such use may cause the discharge
<br />pressure to become excessive, and can also result in failure
<br />of the valve itself. If blower capacity appears to be too low,
<br />refer to the TROUBLE SHOOTING CHECKLIST first. If
<br />no help is found there it may be possible to increase the
<br />blower speed. Before attempting this change, contact the
<br />nearest Sales Office for recommendations. Be prepared to
<br />furnish data on actual air requirements and operating
<br />pressure/temperature conditions.
<br />For equipment covered specifically or indirectly in this
<br />instruction book, it is important that all personnel observe
<br />safety precautions to minimize the chances of injury. Among
<br />many considerations, the following should particularly be
<br />noted:
<br />❑ Blower casing and associated piping or accessories may
<br />become hot enough to cause major skin burns on contact.
<br />© Internal and external rotating parts of the blower and
<br />driving equipment can produce serious physical injuries.
<br />Do not reach into any opening in the blower while it is
<br />operating, or while subject to accidental starting. Cover
<br />external moving parts with adequate guards,
<br />❑ Disconnect power before doing any work, and avoid by-
<br />passing or rendering inoperative any safety or protec-
<br />tive devices.
<br />L1 If blower is operated with piping disconnected, place a
<br />strong coarse screen over the inlet and avoid standing
<br />in the discharge air stream.
<br />❑ Stay clear of open inlet piping (suction area) of pressure
<br />blowers, and the open discharge blast from vacuum
<br />blowers.
<br />❑ Stay clear of the blast from pressure relief valves and
<br />the suction area of vacuum relief valves.
<br />[J Avoid extended exposure in close proximity to
<br />machinery which exceeds safe noise levels. Use proper
<br />ear protection
<br />❑ Use proper care and good procedures in handling, lifting,
<br />installing, operating and maintaining the equipment.
<br />© Casing pressure must not exceed 25 PSI (172 kPa) gauge.
<br />Do not pressurize vented cavities from an external
<br />source, nor restrict the vents.
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