Xylem Bell & Gossett VTP Serie Manual De Instrucciones página 17

This requires the use of a dynamometer scale and
an adapter fitting to grip the tube. TUBE TENSION
ADAPTER AVAILABLE THROUGH FACTORY.
With the tension plate installed manually but
not tightened, thread the special fitting onto the
top of the tube to full engagement. Attach the
dynamometer scale to the fitting, and connect the
upper end of the scale to the hoist hook. Operate
the hoist hook to apply the required tension. This
should pull the tension plate off the discharge head.
Manually thread the tension plate to reset it. Release
tension, remove dynamometer scale and special
fitting.
WRENCHING METHOD
1. If a dynamometer is not available, the tube can
be tensioned by wrenching the tube tension
plate. Make up a spanner wrench to straddle the
projecting threaded tube end and to engage the tube
tension plate capscrew holes by two lugs. Torque
the tension plate to take all the slack out of the shaft
tubing and induce a reasonable amount of tension
by turning the tension plate counterclockwise.
For tubing 2½" (63.5mm) and larger, a man's full
strength on a 3 foot (915mm) lever arm is sufficient.
For smaller sizes, less pull must be exercised.
Figure 10
NOTE: Do not turn clockwise to align holes in tension
plate and discharge head.
INSTALLING TENSION NUT
1. (See Figure 10). Install capscrews (760) in the
tension plate. Pour one pint of oil down the oil
tube. Note: Factory assembled unit has no oil in it.
Oil must added in the field.
2. Install packing (620) in the tension plate and thread
the tension nut (626), tightening it firmly against the
packing.
3. If a packed type tension nut (626) is used (for water
flush), install packing (620), packing gland (618)
and secure with stud (739) and nut (735). Screw
nut finger tight. Install line assembly (635) and
connect to flush liquid supply (see Figure 10).
Be sure that the top of the enclosing tube
CAUTION
does not interference with the tension nut.
4. If the top of the tube interferes with the tension nut,
determine the distance, if the tube is too long or too
short. If the tube is too short, it must be replaced
with a longer tube of the correct length. If the tube
is too long, it must be cut to the correct length and
re-threaded. Reinstall and re-level pump.
LUBRICATION SYSTEM
1. Connect solenoid valve (if provided), oil lines, and
fill the oil reservoir with oil.
2. Check the lubricator feed and see that the oil
reservoir is flowing freely. (In the case of a solenoid
valve, temporary power connections are required.)
Set the proper drops per minute on the regulator.
Table 2 shows recommended regulator setting.
TABLE 2 – Regulator Setting
DROPS PER MINUTE
PER 100 FEET
(30.48 m) OF SETTING
8
16
20 2.19 and larger
INSTALLING THE TENSION PLATE WITH BRONZE
TENSION NUT
Assemble Tension Plate Assembly as shown in Figure 11.
1. Remove the lock bolt (636) and o-ring (620).
Thoroughly clean the tension plate (625) include
the o-ring groove. Lightly grease the o-ring and re-
install it.
2. Clean the surface of the discharge head where the
tension plate will be mounted and remove any nicks
or burrs with a fine flat file. Clean the O.D. of the
tube nipple. Carefully install the tension plate and
gasket (779). Evenly tighten the mounting capscrews
(759F).
3. Pour one pint of recommended oil down the tube
nipple (629). (See page 27 for recommended
lubricants.) Note: Factory assembled unit has no oil
in it. Oil must added in the field.
SHAFT SIZE SHAFT SIZE
(INCH) (mm)
0.75 to 1.00 19 to 25
1.19 to 1.94 30 to 50
55 and larger
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