Gorman-Rupp Pumps SE2C3A 115V 1P 1483930 and up - Manual (Page 35)

OM−06493 SE SERIES
MAINTENANCE & REPAIR PAGE E − 14
vacuum and pressure tested any time the seal and/
or motor are serviced. The seal cavity must be
pressurized to prevent separation of the seal faces
or unseating the stationary seal seat between the
seal and motor cavities. Use a manometer with a
range of 30 to 0 to 30 inches of mercury to perform
the vacuum test. Do not use a vacuum gauge. Vac-
uum gauges are not sensitive enough to detect mi-
nor leaks.
Drain all of the oil from both the seal and motor
cavities before performing the test. Oil within the
motor cavity will be drawn into the system, result-
ing in damage to the vacuum pump or manometer.
It is recommended that a vacuum pump be used to
draw the vacuum on the motor cavity. If a vacuum
pump is not available, a compressor/venturi sys-
tem may be used. If the compressor/venturi cannot
draw the vacuum level shown in Table E-1, draw
the motor cavity vacuum down as far as the system
will allow, then pressurize the seal cavity so the dif-
ferential between the two cavities is the same as
the differential between the readings shown in the
table.
If a compressor/venturi system is used, install full-
closing ball-type shutoff valves with quick-discon-
nect fittings in the pipe plug holes in both the motor
and seal cavities. This will allow the pressure (or
vacuum) to be maintained while using the com-
pressor to perform the second portion of the test.
Figure E-3 shows a simple schematic for setting up
either a vacuum pump or a venturi/compressor
test system.
ООО
ООО
ООО
Tee
Manometer
Vacuum Pump
Submersible
Pump
Full-Closing
Ball-Type
Shutoff Valve
Quick Disconnect
Fitting
Quick Disconnect
Fitting
Air Compressor
Venturi
Vacuum Test
Motor Cavity
Use Compressor
to Pressure Test
Seal Cavity
Figure E-3. Vacuum/Pressure Test System
Table E-1 shows the motor cavity vacuum and seal
cavity pressure readings for the test, and the dura-
tion to maintain each reading. Any change in the readings during the test indicates a leak which
must be identified and corrected before putting the
pump back into service.