Howden Roots RAS Whispair, Installation, Operation & Maintenance Manual

Page: 14 / 33

ILRB-3000 GEA20261
RAS and RAS-J WHISPAIR Blowers
Page 14 of 33
Safety Precautions
When working with any of the equipment mentioned in this
manual, it is important to observe safety precautions to
reduce chance of injury. The following safety
considerations are particularly important:
• The blower casing and associated piping or accessories
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 physical 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 do not
bypass or render inoperable any safety or protective
devices.
• If the blower is operated while the piping is 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
that exceeds safe noise levels.
• Use proper care and good procedures in handling, lifting,
installing, operating, and maintaining the equipment.
• Use proper care and good procedures in handling, lifting,
installing, operating, and maintaining the equipment.
• Casing pressure must not exceed 25 PSI (172 kPa)
gauge. Do not pressurize vented cavities from an external
source. Do not restrict the vents.
• Do not use air blowers on explosive or hazardous gases.
• Other potential hazards to safety may be associated with
operating this equipment. All personnel working in or
passing through the area should be warned by signs and
trained to exercise adequate general safety precautions.
Preventive Maintenance
Daily
• Record the following:
− Lube oil pressure (if applicable)
− Lube oil temperature (if applicable)
− Blower inlet temperature
− Blower inlet pressure
− Blower discharge temperature
− Blower discharge pressure or differential pressure
− Motor amperage
− Motor voltage, if available
− Motor stator temperature, if available
− Motor bearing temperature, if available
• Observe any abnormalities, such as burned paint,
unusual noises, vibration, strange odours, oil leaks, and so
on.
• Review log sheets to determine if there are any changes
from previous readings. It is very important to look for any
changes or trends that might indicate pending problems.
• Check oil levels.
• Record hour meter readings.
Monthly
Record bearing housing vibration levels at each bearing in
the horizontal, vertical, and axial planes. Use velocity
(inches per second) measurements and note any changes
from previous readings. Take a complete vibration
signature (amplitude versus frequency) if any trends are
noted. It may be helpful to keep a chart noting monthly
readings.
Quarterly
• Sample the lube oil
• Change the oil if the following values are exceeded:
− Water 100 PPM maximum
− Metals 200 PPM maximum
− Acid 5.0 to 7.5 mg/KOH/g maximum
• Increase the sample frequency if any of the above values
show a 20 to 25 percent increase over the last sample.
• Flush all oil reservoirs before filling with clean oil. Annually
• Remove an inlet expansion joint, inspect the impellers,
measure impeller clearances, and note wear patterns.
ILRB-3000 GEA20261 RAS and RAS-J WHISPAIR Blowers.pdf 14 03/09/2015 13:21:27