Goulds Pumps JC - IOM - Manual (Page 19)

OPERATION
PREPARATION FOR START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . 17
PUMP START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
LOCATING PROBLEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
PREPARATION FOR START-UP
STUFFING BOXES
In the conventional stuffing box, mechanical seals and
packing seal between the stationary and rotating
components of the pump. Generally, a clear liquid such as
water is forced through the stuffing box to lubricate the
sealing elements. The lubricating liquid pressure must
exceed the pressure of the pumpage at the stuffing box. For
end suction pumps, lubricating liquid pressure should be
10-15 PSIG higher than the discharge pressure. For side
and double suction pumps, lubricating liquid pressure
should be 10-15 PSIG higher than the suction pressure.
NOTE: To determine suction or discharge pressure,
use gauge pressure only.
The piping supplying the lubrication liquid should be fitted
tightly to prevent air from entering. On suction lifts, a small
quantity of air entering the pump at this point may result in
loss of suction.
Lubrication liquid pressure is controlled by a valve on the
outlet piping. Since the liquid leaking from the stuffing box
should be clear, control of the packing lubricant will vary
with the condition of the packing. Increase pressure within
the stuffing box by closing outlet valve. Adjustments
should be slow and consistent with the run-in procedure for
new packing.
The lubricating liquid must be clean, free of grit and acid.
Shaft sleeve scoring, packing destruction, and mechanical
seal face damage will result from contaminated lubricant.
PACKING
!
Packed stuffing boxes are not allowed in an ATEX
classified environment.
Original equipment packing is a suitable grade for the
service intended. To replace original packing, contact your
local Goulds representative.
Refer to Bill of Material and Assembly Drawing for
specific packing size and configuration.
PACKING PROCEDURE
1. Stuffing box and shaft sleeve must be clean and free of
grit.
2. Form packing over shaft or mandrel of same diameter.
Carefully cut to packing length. Discard rings cut too
short.
3. Pre-form each ring by coiling 1-½ turns.
4. To install packing rings, do not pull straight. Expand
the coil as a coil spring. (See Fig. W13.)
JC IOM 5/08
17
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