8
NOTE
Do not exceed maximum RPM or discharge temperature as stated above.
To permit continued satisfactory performance, a vacuum booster must be operated within certain approved
limiting conditions. The manufacturer’s warranty is, of course, also contingent on such operation. Maximum
limits for pressure, temperature and speed are specified here for various booster sizes when operated
under the standard atmospheric conditions. Do not exceed any one of these limits.
EXAMPLE: Seldom does the operation of a vacuum booster result in pressure differentials large enough
to strain the booster drive train (bearings, gears and seals). Typically in vacuum boosting, the maximum
allowable temperature limit (the limit is a function of the temperature rise as well as the inlet temperature)
for any particular booster may occur well before the maximum speed or allowable power rating is reached.
Temperature rise then becomes the limiting condition. In other words, the operating limit is always to be
determined by the maximum rating reached first, and it can be any one of the three: temperature, speed,
or horsepower.
NOTE
Specially ordered blowers with nonstandard construction, or with rotor end
clearances greater than shown within the Assembly Clearances table, will
not have the operating limits specied here. Contact your Tuthill Vacuum &
Blower Systems sales representative for specic information.
NOTE
Special attention must be paid when a vacuum booster has a higher than
standard ambient suction temperature. Special recommendations for
operating parameters and/or additional cooling may be recommended.
Consult the factory or local representative for appropriate information.
Deep vacuum requires instrumentation much more sensitive than standard thermometers and mercury
type pressure or vacuum gauges. At operation pressures less than 100 Torr (mmHg), low-deadband cut-in
switches and low-mass thermocouples should be utilized and positioned such that the sensor is connected
to the inlet and discharge connections of the vacuum booster. NPT connections are provided at each of the
inlet and discharge ports for this purpose. Standard temperature switches, because of their higher mass, do
not have reaction times fast enough to adequately protect the vacuum booster. Likewise, standard vacuum
switches are not recommended for cut-in switches as vacuum boosting typically requires a very accurate
cut-in point. A tachometer will enable periodic checks of operating speed.
5. INSTALLATION
5.1 GENERAL
DANGER
The booster is not intended to be used with explosive products or in
explosive environments. Consult the factory for support.
DANGER
The booster is not intended to be used with hazardous or toxic gases.
Consult the manufacturer if the booster is to be used in these applications.
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