Xylem IMDWT R02 Model DWT Deep Well Turbine Pumps - Manual (Page 14)

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3. Remove coupling guard if provided. Attach a sling
to the lifting lugs on the side of the discharge head
through windows and hoist discharge head over the
protruding top shaft (or stub shaft).
Do not bump or scrape the shaft
protruding above the column. This could
result in bending or damaging the shaft.
4. Orient the discharge head in the required position
and lower the head. Centering the vertical hole with
the top shaft protruding above the column. For
threaded column, continue to lower the discharge
head until the large threaded hole in the bottom
of the discharge head rests squarely on top of
column. Clean the threads at upper end of column
assembly and lubricate with thread compound.
Rotate discharge head, screw it onto the column,
for short set-pump, (without the column adjusting
nipple) butting the top of column tightly against the
discharge head.
5. If pump has a column adjusting nipple (631), for
open lineshaft, screw the discharge head onto the
column nipple until the end of the stub shaft is
“HT” below the face the driver mounting flange
of the discharge head. (See Figure 7 for detail.)
For enclosed lineshaft, screw the discharge head
onto the column nipple until the “F” dimension is
satisfied (See Figure 7). Tighten the lock ring (639).
6. For flanged column, continue to lower the discharge
head until the discharge head engages the column.
Install capscrews and secure discharge head to the
column flange. Tighten capscrews gradually in
diametrically opposite pairs. Lift pump assembly
high enough to allow rotation of the supports.
Realign and lower assembly. Install and tighten
remaining capscrews. Repeat the rotating and
the tightening procedure until all capscrews are
uniformly tight.
7. Hoist the discharge head by lifting lug and remove
the elevator clamp attached to column.
8. Remove the support timbers or I-beams and clean
the top of foundation or base plate. Orient the
discharge head in the required position.
NOTE: Sling should be rated to handle in excess of the
pump weight.
9. Lower bowl, column and head assembly, until
discharge head mounting flange engages base plate.
Secure discharge head to the foundation or base
plate. Check the levelness of the discharge head in
all directions, utilizing a machinist level across the
driver’s mounting surface of the discharge head.
10. Check whether the top shaft (or stub shaft) is in
the center of the stuffing box bore. If not, the shaft
must be centered by shimming the head base and
the sub base (or the foundation).
11. Rotate the shaft approximately 90 degree. Check
again whether the shaft is at the center of the
stuffing box bore or not. If not, either the top
shaft is bent or the first shaft below it did not butt
properly. Correction must be made before the
installation procedures can proceeds.
INSTALLING THE STUFFING BoX
Assemble stuffing box as shown in Figure 8.
1. Clean the surface of the discharge head where
the stuffing box will be mounted and remove any
nicks or burrs with a fine flat file. Position gasket
on surface. Slide stuffing box (616) down over
headshaft and into position on the gasket. Secure
stuffing box with capscrews.
2. Grease the packing ring (620) for easier installation.
3. Twist the packing ring sideways to get it around the
shaft easily. Start the first ring into the stuffing box.
When the entire ring is worked in using the fingers,
tamp it down using a split wood bushing (or equal)
and push the packing ring down firmly. It must seal
on the shaft and bore of the stuffing box. Install
three (3) rings in this manner. Stagger ring joints
90 degrees apart. The split gland may be used as a
tamper for the top ring.
4. Insert lantern ring (622) into stuffing box. Be sure
it is properly positioned so that it aligns with the
lubrication passage in the stuffing box.
5. Insert three (3) additional rings of packing. Stagger
ring joints 90 degrees apart.
CAUTION
L
STUB SHAFT
J
M
TUBE NIPPLE
C
STD
LINESHAFT
18.00
COL. NIPPLE
H
D
E
HT
F
HEAD SHAFT
CD
XH
Figure 8
Shaft Size (in.) 1.00 1.19 1.50 1.69 1.94 2.18 2.44
Head Size HT M
4" 2.50 17.50 H = 5.88 F = 17.62
6" 2.88 17.50 H = 6.25 F = 17.25 H = 5.63 F = 17.88
8" 3.00 17.50 H = 7.38 F = 16.13 H = 6.75 F = 16.75 H = 6.25 F = 17.25
10" 3.00 17.50 H = 7.63 F = 15.88 H = 7.00 F = 16.50 H = 6.26 F = 17.00
12" 4.69 21.00 H = 9.19 F = 17.18 H = 8.69 F = 18.31