CAMCORP Blower Package with Roots Blower - Manual (Page 25)

2 For your nearest ROOTS Office, dial our Customer Service Hot Line 1 877 363 ROOTS (7668).
S
AFETY
P
RECAUTIONS
It is important that all personnel observe safety
precautions to minimize the chances of injury.
Among many considerations, the following should
be particularly noted:
• 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. Protect external moving parts
with adequate guards.
• Disconnect power before doing any work, and avoid
bypassing 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.
CAUTION: Never cover the blower inlet with
your hand or other part of body.
• 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.
• Use proper care and good procedures in handling,
lifting, installing, operating and maintaining the
equipment.
• Casing pressure must not exceed 25 PSI
(1725 mbar) gauge. Do not pressurize vented
cavities from an external source, nor restrict the
vents without first consulting ROOTS.
• Do not use air blowers on explosive or
hazardous gases.
• Other potential hazards to safety may also be
associated with operation of this equipment. All
personnel working in or passing through the area
should be trained to exercise adequate general
safety precautions.
O
PERATING
L
IMITATIONS
A ROOTS ™ blower or exhauster must be operated
within certain approved limiting conditions to enable
continued satisfactory performance. Warranty is
contingent on such operation.
Maximum limits for pressure, temperature and speed
are specified in TABLE 1 for various models & sizes
of blowers & exhausters. These limits apply to all units
of normal construction, when operated under
standard atmospheric conditions. Be sure to arrange
connections or taps for thermometers and pressure
or vacuum gauges at or near the inlet and discharge
connections of the unit. These, along with a good
tachometer, will enable periodic checks of
operating conditions.
PRESSURE – The pressure rise, between inlet and
discharge, must not exceed the figure listed for the
specific unit frame size concerned. Also, in any system
where the unit inlet is at a positive pressure above
atmosphere a maximum case rating of 25 PSI gauge
(1725 mbar) should not be exceeded without first
consulting the ROOTS. Never should the maximum
allowable differential pressure be exceeded.
On vacuum service, with the discharge to atmospheric
pressure, the inlet suction or vacuum must not be
greater than values listed for the specific frame size.
TEMPERATURE – Blower & exhauster frame sizes are
approved only for installations where the following
temperature limitations can be maintained in service:
• Measured temperature rise must not exceed listed
values when the inlet is at ambient temperature.
Ambient is considered as the general temperature
of the space around the unit. This is not outdoor
temperature unless the unit is installed outdoors.
• If inlet temperature is higher than ambient, the
listed allowable temperature rise values must be
reduced by 2/3 of the difference between the
actual measured inlet temperature and the
ambient temperature.
• The average of the inlet and discharge temperature
must not exceed 250°F. (121°C).
SPEED – These blowers & exhausters may
be operated at speeds up to the maximum listed for
the various frame sizes. They may be direct coupled
to suitable constant speed drivers if pressure/tempera-
ture conditions are also within limits. At low speeds,
excessive temperature rise may be a limiting factor.
Special Note: The listed maximum allowable tempera-
ture rise for any particular blower & exhauster may
occur well before its maximum pressure or vacuum
rating is reached. This may occur at high altitude, low
vacuum or at very low speed. The units’ operating limit
is always determined by the maximum rating reached
first. It can be any one of the three: Pressure,
Temperature or Speed.