9
4.0 PREPARATION FOR INSTALLATION
4.1 Equipment
If practical, place the dial indicator tip
on the end of the shaft sleeve or on a
step in the shaft to measure end play.
Alternately push and pull the shaft in
the axial direction. If the bearings are
in good condition, end play should not
exceed 0,13 mm (.005").
Remove all sharp corners, burrs, and
scratches on the shaft, especially in
areas where the O-Ring will slide, and
polish if necessary to achieve a 0,8
micron (32 microinch) Ra finish. Make
sure the shaft or sleeve diameter is
within 0,05 mm (.002") of nominal.
Use a dial indicator to measure the shaft
runout in the area where the seal will
be installed. Runout should not exceed
0,03 mm TIR per mm (.001 in per inch)
of shaft diameter.
4.2 Mechanical Seal
1. Check the chemical listing to
determine if the O-Rings installed in
this seal are compatible with the fluid
being sealed.
2. CAUTION: If the seal is operating at
a stuffing box pressure over 20 bar
(300 psig) for sizes 25 to 60 mm (1" to
2 1/2"), or 16 bar (250 psig) for sizes
65 to 120 mm (2 5/8" to 4 3/4"), or if
the shaft is case-hardened, replace
the 316 stainless steel set screws
with the hardened steel set screws
supplied with the seal. The 1/4 dog
point set screws go into the small
holes in the sleeve. Do not disengage
these screws from the sleeve when
positioning the seal. The cup point set
screws go through the larger holes
in the sleeve. Make sure all screws
are engaged in the sleeve but do not
protrude into the ID bore. Also, when
repositioning or removing the seal,
make sure the centering clips and
socket head cap screws are engaged.
3. Centering clips have been preset
at the factory. If for any reason you
loosen or remove the centering clip
cap screw, retighten as follows prior to
installing the seal on the equipment:
Tighten the cap screw finger tight.
Then using hex wrench, tighten cap
screw an additional 1/8 turn. This will
approximate the 3,4 Nm (30 inch-
pounds) of torque for sizes 45 to 60
mm (1.75" to 2 1/2"), and 4,5 Nm
(40 inch-pounds) of torque for 65 to
120 mm (2 5/8" to 4 3/4") set at the
factory. For sizes 25 to 43 mm (1"
to 1.625") tighten the button head
screws to 2,3 Nm (20 inch-pounds) of
torque.
If possible, attach a base dial indicator
to the shaft and rotate both the
indicator and shaft slowly while reading
the runout of the stuffing box face.
Misalignment of the stuffing box face
relative to the shaft should not exceed
0,005 mm TIR per mm (.005 in per inch)
of shaft diameter.
The stuffing box face must be flat
and smooth enough to seal the
gland. Surface roughness should
be 3,2 microns (125 microinch) Ra
maximum for gaskets and 0,8 micron
(32 microinch) Ra for O-Rings. Steps
between halves of split case pumps
should be machined flat. Make sure the
stuffing box is clean and clear along its
entire length.
2
3
1
.005"
0,13 mm
<
4
ø
1000
ø
<
32 µ"
0,8 µm Ra
ø
<
.002"
0,05 mm
±
ø
ø
200
<
125 µ"
3,2 µm
