Goulds Pumps ANSI FAMILY IOM (ATEX Compliant) - Manual (Page 42)

5. Scribe a line on the blued shaft/sleeve at the face
of the seal chamber.
6. Remove the casing, impeller, and seal chamber
per the instructions in Section 6 - Disassembly &
Reassembly.
7. Slide the gland (with the stationary seat and gland
gasket installed) onto the shaft until it contacts the
inboard labyrinth oil seal.
8. Install the mechanical seal rotary unit per the
manufacturer’s instructions using the scribed line
and the seal reference dimension.
9. Reassemble the seal chamber per the
instructions in Section 6 - Disassembly &
Reassembly.
10. Slide the gland on the seal chamber studs and
secure with the gland nuts. Be sure to tighten the
nuts evenly such that the gland is seated on the
seal chamber pilot and is perpendicular to the
shaft.
11. Complete the reassembly of the pump per the
instructions in Section 6 - Dissassembly &
Reassembly.
Conventional Outside Component Mechanical Seal:
1. Assemble the seal chamber per the instructions in
Section 6 - Disassembly & Reassembly.
2. Apply bluing to the shaft/sleeve at the face of the
seal chamber.
3. Continue the complete reassembly of the pump,
less the mechanical seal.
4. Set the impeller clearance per the instructions in
Section 4 - Operation.
5. Scribe a line on the blued shaft/sleeve at the face
of the seal chamber.
6. Remove the casing, impeller, and seal chamber
per the instructions in Section 6 - Disassembly &
Reassembly.
7. Install the mechanical seal rotary unit per the
manufacturer’s instructions using the scribed line
and the seal reference dimension. Be sure to
secure the rotary unit in place using the set
screws in the locking ring.
8. Install the gland (with the stationary seat and
gland gaskets installed) on the seal chamber.
9. Reassemble the seal chamber per the
instructions in Section 6 - Disassembly &
Reassembly.
10. Complete the reassembly of the pump per the
instructions in Section 6 - Disassembly &
Reassembly.
The mechanical seal must always be
properly flushed. Failure to do so will
result in excess heat generation and seal
failure.
Connection of Sealing Liquid: For satisfactory
operation, there must be a liquid film between seal
faces to lubricate them. Refer to the seal
manufacturer’s drawing for the location of the taps.
Some methods which may be used to flush/cool the
seal are:
a. Product Flushing - In this arrangement, the
pumpage is piped from the casing (and cooled in
an external heat exchanger, when required) then
injected into seal gland.
b. External Flush - A clean, cool compatible liquid is
injected from an outside source directly into the
seal gland. The flushing liquid must be at a
pressure of 5-15 psi (0.35-1.01 kg/cm
2 ) greater
than the seal chamber pressure. Injection rate
should be
1
2
-2 GPM (2-8 LPM).
c. Other methods may be used which make use of
multiple gland connections and/or seal chamber
connections. Refer to the documentation supplied
with the pump, mechanical seal reference
drawing, and piping diagrams.
Packed stuffing boxes are not allowed in
an ATEX classified environment.
Packed Stuffing Box Option: Models 3196, CV 3196,
HT 3196, LF 3196, and 3796 pumps are shipped
without packing, lantern ring or split gland installed.
These are included with the box of fittings shipped with
the pump and must be installed before start-up.
Installation of Packing:
1. Carefully clean stuffing box bore.
2. Twist the packing just enough to get it around the
shaft (Figs. 27, 28).
3. Insert packing, staggering the joints in each ring
by 90°.
4. The stuffing box arrangement in order of
installation is: 2 packing rings, lantern ring
(two-piece), then 3 packing rings.
l
! CAUTION
Follow instructions to ensure the lantern ring is
located at the flushing connection (Fig. 29).
Otherwise, no flush will be obtained.
40
ANSIFAM IOM - 5/08