Gorman-Rupp Pumps SE2D3 115V 1P 1483930 and up User Manual

Page 36

OM-06494

SE SERIES

MAINTENANCE & REPAIR

PAGE E - 14

VACUUM/PRESSURE TESTING

To ensure the water‐tight integrity of the pump, it is
recommended that the motor and seal cavities be
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

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.

Table E‐1. Vacuum/Pressure Test Data

Seal Cavity

Pressure

(PSI)

Pump

Model

Motor Cavity

Vacuum

(In. Hg.)

Duration

(Minutes)

Duration

(Minutes)

S2D3

LUBRICATION

Seal Cavity

Check the oil level in the seal cavity before initial
startup, after the first two weeks of operation, and
every month thereafter.

Check the oil level only when the pump
is cool. If the oil level plug is removed