Flowserve Guardian Sealless Metallic - Manual (Page 45)

GUARDIAN USER INSTRUCTIONS ENGLISH 71569212 08-11
Page 45 of 68 flowserve.com
6.8.1 Wet end
a) Inspect the casing, impeller, bearing holder and
inner magnet for wear, corrosion and defects.
b) Inspect the pins in the inner magnet, bearing
holder and thrust collar for diametrical wear. The
nominal diameter of these pins is 4.737 mm
(0.1865 in.). Replace these pins if diametrical
wear exceeds 0.508 mm (0.020 in.). These pins
must be press fit using an arbor press. The height
of the pins above the surface they are pressed into
must not exceed 2.92 mm (0.115 in.) but not be
less than 2.16 mm (0.085 in.).
c) Inspect the bushings and thrust journals for wear.
Measure the thickness of the inboard thrust journal
and the thickness of the flange on the inboard
bushing. The nominal thicknesses for these parts
can be found in
Figure 6-23. If the sum of the
axial wear on these two parts exceeds 0.38 mm
(0.015 in.), replace these parts immediately.
Repeat this inspection for the outboard bushing
and outboard thrust journal. The sum of the axial
wear must not exceed 0.38 mm (0.015 in.) on the
outboard components.
d) Inspect the shaft journal and bushings for
diametrical wear. Total diametrical wear must
not exceed 0.610 mm (0.024 in.). Measure the
outside diameter of the shaft journal and the
inside diameter of the bushings. The nominal
diameters for these parts can be found in Figure
6-23. If the sum of the wear on the shaft journal
and its corresponding bushing exceeds the
allowable diametrical wear, identify the worn
parts and replace them immediately.
Figure 6-23: Wet end bearings allowable wear
Total axial allowable wear 0.38 mm (0.015 in.)
Total diametrical allowable wear 0.61 mm (0.024 in.)
BUSHING AND JOURNAL DIMENSIONS AS NEW
Thrust journal
thickness
I.B. O.B.
Bushing
flange
thickness
Bushing
I.D.
Shaft
journal
O.D.
Group 1
4.737
(0.1865)
6.337
(0.2495)
9.45
(0.372)
34.938
(1.3755)
34.87
(1.373)
Group 2
4.737
(0.1865)
4.737
(0.1865)
9.45
(0.372)
47.377
(1.8755)
47.536
(1.8715)
Note: Dimensions shown above are in millimeters (inches).
e) Inspect the containment shell to ensure the
allowable corrosion limit has not been exceeded.
The containment shell thickness is 1.27 mm
(0.050 in.) as new and the allowable corrosion is
0.635 mm (0.025 in.), 150 lb Class [0.508 mm
(0.020 in.), 300 lb Class].
f) All wet end O-rings and gaskets must be
replaced. Inspect O-ring grooves for integrity. It
is good practice to replace all O-rings.
6.8.2 Power end
a) Inspect the outer magnet rub pads for wear. The
height of the rub pads above the magnet outer
diameter is 1.0 mm (0.04 in.) as new. If wear is
greater than 0.5 mm (0.02 in.), then the rub pads
should be replaced. The primary cause of worn
rub pads is an anti-friction bearing failure.
b) Inspect the anti-friction bearings for scoring,
pitting, scratching and rusting.
Use of replacement parts not
provided by Flowserve may result in premature
pump failure, excessive damage to equipment, or
personal injury. Use of non OEM or
remanufactured parts voids all warranties provided.
Additional parameters checked by Flowserve
The parameters listed below are somewhat more
difficult to measure and/or may require specialized
equipment. For this reason, they are not typically
checked by our customers, although they are
monitored by Flowserve during the manufacturing
and/or design process.
6.8.3
Shaft
Replace if grooved, pitted or worn. Prior to mounting
bearings or installing the shaft into the bearing
housing, check the following parameters.
6.8.3.1
Diameter/tolerance, under bearings
In order to ensure proper fit between the shaft and
bearings, verify that both the inboard (IB) and
outboard (OB) shaft diameter is consistently within
the minimum/maximum values shown in Figure 6-24.
A micrometer should be used to check these outside
diameter (OD) dimensions on the shaft.
Figure 6-24
Group 1 Group 2
Bearing
35.000/34.989
(1.3780/1.3775)
50.000/49.987
(1.9685/1.9680)
Shaft
35.014/35.004
(1.3785/1.3781)
50.013/50.003
(1.9690/1.9686)
IB and OB
bearing/
shaft
mm (in.)
Fit
0.025T/0.004T
(0.0010T/0.0001T)
0.026T/0.003T
(0.0010T/0.0001T)
6.8.4 Bearings
It is recommended that bearings not be re-used after
removal from the shaft. Prior to mounting bearings,
check the following parameters.
6.8.4.1
Diameter/tolerance, inside diameter
In order to ensure proper fit between bearings and
the shaft, verify that the inside diameter (ID) of both
the IB and OB bearing are consistently within the
minimum/maximum values shown in Figure 6-24. An
inside caliper should be used to check these ID
diameters on the bearings.