Xylem 9100 Series Base Mounted Centrifugal Fire Pumps AC8585 REV.C - Manual (Page 35)

LIMITED END FLOAT COUPLINGS
For units with drivers having sleeve bearings the
coupling halves are set to limit total shaft axial
movement to less than one-half of he motor rotor
assembly end float. This is accomplished by
inserting a phenolic disc, or equivalent, of a
specified thickness between the motor and pump
shaft (See Figure 20).
Some 9100 Fire Pump installations may use the
all metal, gear type coupling. Where limited end
float gear type couplings are used, the coupling
hubs are slip-fit onto the pump and motor shafts.
After installation of the coupling covers and hubs;
with the motor set on its Magnetic Center, butt the
pump and motor shafts with the phenolic disc
inserted between them. (The pump thrust bearing
limits end float toward the pump, and the coupling
covers limit end float towards the motor.) The
thrust bearing of the pump is large enough to carry
any magnetic thrust developed by the motor when
aligned properly.
Once the above instructions have been followed
out completely, the Alignment Procedures
starting on page 9 should then be followed.
35
FIGURE 20 - LIMITED END FLOAT COUPLING
ARRANGEMENT
ORDERING PARTS
The pumps covered by this manual have been
designed and built with certain replaceable
wearing parts. The recommended inventory of
spare parts depends upon the installation and the
importance of continued operation.
For critical service requiring a minimum of “down
time” a complete or “quick change” rotating
element is recommended.
For normal service, with repairs to be made in the
field, the following parts are recommended for
stock.
1 set of bearings
1 set of wearing rings
1 set of gaskets, “O” rings and grease seals
2 mechanical seals (complete)
or
2 sets of packing (if provided)
1 set of shaft sleeves (if provided)
Parts should be ordered as far in advance of their
use as possible since circumstances beyond the
control of the company may reduce existing stock.
Not all parts are stocked and must be
manufactured for each order.
To facilitate rapid handling of your order for spare
parts, be sure to include the following information:
PHENOLIC DISC
COVER
1. Serial number of the pump.
HUB
2. Catalog number of the part.
3. Quantity of each part.
4. Name of the part.
MOTOR SHAFT PUMP SHAFT 5. Material desired. (Parts will be furnished in
original materials unless specified as a
material change. All material substitutions
should be discussed with the factory.)
CAPSCREW TORQUE (FOOT-POUND)
CAPSCREW DIAMETER CAPSCREW TYPE HEAD MARKING
1/4 5/16 3/8 7/16 1/2 5/8 3/4 7/8 1
SAE Grade 2 6 13 25 38 60 120 190 210 300
Brass
Stainless Steel
or
4 10 17 27 42 83 130 200 300
SAE Grade 5 10 20 35 60 90 180 325 525 800
SAE Grade 8 13 28 46 75 115 225 370 590 895