Goulds Pumps 3410 - IOM - Manual (Page 31)

• Figure 24 shows a single inside unbalanced
mechanical seal mounted in the S group standard
stuffing box. You will note that the pilot lip has been
machined off the gland since there is inadequate room
in the bore for the pilot. With this arrangement, it is
necessary to use a feeler gauge or shims to center the
gland on the shaft.
• Figure 25 shows a bellows type balanced mechanical
seal mounted in an S group standard stuffing box.
There is inadequate room in the standard stuffing box
to mount a conventional balanced seal requiring a
stepped shaft sleeve. Use of these seals requires a
remachine of the stuffing box bores.
The following mechanical seals can be installed in
standard stuffing boxes by utilizing a remachined,
non-pilot gland:
- Crane type 1, 81T, 9T, and Metal Bellows (680)
- Flowserve RO
• Pumps supplied with mechanical seals can be
converted to packing. A packing conversion kit is
available as shown in Fig. 26. It includes all the
standard stuffing box fittings plus a liner sleeve that
presses into the oversize stuffing box bore.
CONNECTION OF SEALING LIQUID
(PACKED BOX)
General
If stuffing box pressure is above atmospheric pressure and
pumpage is clean, normal gland leakage of 40 to 60 drops
per minute is usually sufficient to lubricate and cool
packing and sealing liquid is not required.
Clean sealing liquid is required when:
• Abrasive particles in pumpage could score shaft of
sleeve.
• Stuffing box pressure is below atmospheric pressure
due to pump running with suction lift, or when
suction source is under vacuum. Under these
conditions, packing will not be cooled and lubricated
and air will be drawn into pump.
Sealing Liquid
Sealing liquid may be supplied by recirculation of pumpage
through a line from casing to stuffing box. If pumpage is
abrasive, an outside source of clean compatible liquid must
be used at a pressure of 15 PSI or greater above suction
pressure.
CONNECTION OF COOLING
WATER PIPING TO OPTIONAL
PUMP FEATURES
Quench Gland
Tapped openings on top of the quench gland are provided
for water sealing. Bypass piping is connected from a “T”
installed in vent plug opening at top of upper casing to the
tapped opening in the stuffing box.
3410 IOM 1/2010
29
Fig. 25
Fig. 26
4