Installing The Discharge Head; Installing The Stuffing Box - Xylem Bell & Gossett VTP Serie Manual De Instrucciones

INSTALLING THE DISCHARGE HEAD

VTP pumps are provided with either a cast iron or
fabricated steel type head. For pump with below
ground discharge, a motor stand is provided instead the
discharge head. Install the discharge head as follows:
1. If the stuffing box (See Fig. 9) or tension nut (See
Fig. 10) is assembled to the head, remove it and all
the attached piping.
2. For threaded column, check to be sure that the
flange column (637) is securely attached to the
bottom of the discharge head. Check and tighten
the capscrews (or socket head screw) gradually in
diametrically opposite pairs.
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
CAUTION
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. Center 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. For flanged column, continue to lower the discharge
head until the discharge head engages the column
flange. Install capscrews and secure discharge head
to the column flange. Tighten capscrews gradually
in diametrically opposite pairs. Lift the 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.
6. Hoist the discharge head by lifting lug and remove
the elevator clamp attached to column.
7. 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.
8. 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.
9. 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).
10. Rotate the shaft approximately 90 degrees. 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 proceed.

INSTALLING THE STUFFING BOX

Assemble stuffing box as shown in Figure 9.
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. Make sure
the capscrews are torqued equally to prevent
misalignment.
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 all
six (6) rings and lantern ring as shown in the Figure
9. Stagger ring joints 90 degrees apart. The split
gland may be used as a tamper for the top ring.
4. Install the split gland and screw nuts on the split
gland studs. Tighten nuts then relieve the nuts and
tighten finger tight.
Check that the split gland is square in the
CAUTION
stuffing box. Cocking can cause uneven
compression of packing and damage to the shaft or sleeve
and heat up the shaft and stuffing box.
5. The stuffing box is shipped with both ports plugged.
If discharge pressure over 100 PSI, remove the plug
on port "A" and attach bypass line. If the discharge
pressure is over 200 PSI the Port "B should also be
opened and attached another relief line.
6. Final adjustment of the stuffing box must be made
at pump
start up. A
properly
packed
stuffing box
should be
loose enough
to allow
the shaft to
be turned
manually.
Also, packing
must allow
leak. See
page 24,
Pump Start
Up #5.
Figure 9
15