Xylem 9100 Series Base Mounted Centrifugal Fire Pumps AC User Manual download pdf (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.

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)

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

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

1 2 ... 30 31 32 33 34 35 36 37

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Xylem 9100 Series Base Mounted Centrifugal Fire Pumps AC User Manual Page 35

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