Goulds Pumps 3410 - IOM - Manual (Page 30)

Mechanical Seals
!
The mechanical seal used in an ATEX classified
environment must be properly certified.
When mechanical seals are furnished, description and
identification is indicated on order write-ups. Separate seal
manufacturer’s installation drawings are attached to pump.
Most seals are installed and adjusted at the factory.
Manufacturer’s drawings should be filed for future use in
maintaining seal and in adjusting seal when pump is
disassembled. To properly prepare seal for operation,
various cooling and flushing flows may have to be
connected. In some cases, these flows are recirculated from
pump casing; in others, liquid from an outside source may
be used. Connect cooling and flushing flows to seal as
directed in manufacturer’s instructions.
• All Model 3410 mechanical seals utilize o-ring
mounted stationary seats and a flush gland with a pilot
fit in the I.D. of the stuffing box as standard. All S
group pumps are standard less shaft sleeves, with
sleeves available as an option. M, L, and XL groups
are standard with shaft sleeves and sleeve nuts.
A single inside unbalanced or integrally balanced
(metal bellows) seal for an S group pump is illustrated
in Fig. 20. This design incorporates the standard
420SS sleeveless shaft and oversized stuffing box
bore. The stuffing box bore is used to pilot the
standard gland.
• Figure 21 illustrates the same type of seal as sown in
Fig. 20, but for M group pumps. Note the shaft is
protected by sleeves and sleeve nuts as standard. All
other features and details are the same.
• Conventional balanced seals require the use of a
stepped shaft sleeve. Figure 22 shows an S group
pump with a stub sleeve to accomplish the seal
balancing. A standard stepped sleeve is used on the M
group to reduce the mounting diameter down to the
standard sleeve nut O.D.. This is illustrated in Fig. 23.
Bellows type mechanical seals are integrally balanced
and do not require a step in the sleeve. They can be
mounted directly on the sleeveless S group shaft of on
the standard non-balanced M group sleeve (Fig. 21.)
• Pumps which are originally supplied with packing
boxes can be converted to mechanical seals in the
field. This conversion requires a remachine of the
stuffing box to allow for the standard gland pilot
feature (Figures 20 and 21) or a remachine operation
of the standard gland to remove the pilot lip (Figures
24 and 25.) In this case, a shimming operation is
required to center the gland on the shaft.
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3410 IOM 1/2010
Fig. 20
Fig. 21
Fig. 22
Fig. 23
Fig. 24