HDX USER INSTRUCTIONS ENGLISH 85392696 - 01/11
Page 39 of 60
PUMP TYPE HDX
U
U
MINIMUM DIAMETER CLEARANCES
Minimum Diameter Clearance
Minimum Diameter Clearance
Temp. up to 260°C
(500°F)
Temp. above 260°C
(500°F)
Wear ring
Wear ring
Wear ring.
Nominal diameter
CastIron /Bronze
12% Chr.Steel
316 Stn. Steel
Carbon-Steel
CastIron/Bronze
12% Chr.Steel
316 Stn. Steel
Carbon-Steel
mm (in.)
mm mm mm mm
Up
To
50.8 (2.0)
0.26
0.39
0.39
0.51
50.9 (2.0)
÷
63.4 (2.5)
0.28
0.41
0.41
0.53
63.5 (2.5)
÷
76.1 (3.0)
0.30
0.43
0.43
0.55
76.2 (3.0)
÷
88.8 (3.5)
0.36
0.49
0.49
0.61
88.9 (3.5)
÷
126.9 (5)
0.40
0.53
0.53
0.65
127 (5.0)
÷
152.3 (6.0)
0.43
0.56
0.56
0.68
152.4 (6.0)
÷
177.7 (7.0)
0.46
0.59
0.59
0.71
177.8 (7.0)
÷
203.1 (8.0)
0.48
0.60
0.60
0.73
203.2 (8.0)
÷
228.5 (9.0)
0.50
0.63
0.63
0.75
228.6 (9.0)
÷
253.9 (10.0)
0.53
0.66
0.66
0.78
254 (10.0)
÷
279.3 (11.0)
0.56
0.69
0.69
0.81
279.4 (11.0)
÷
304.7 (12.0)
0.59
0.72
0.72
0.84
304.8 (12.0)
÷
330.1 (13.0)
0.61
0.74
0.74
0.86
330.2 (13.0)
÷
355.5 (14.0)
0.64
0.77
0.77
0.89
355.6 (14.0)
÷
380.9 (15.0)
0.66
0.79
0.79
0.91
6.8.2 Impeller
a) Remove worn impeller rings by mechanical
turning.
b) Slightly eroded parts can be repaired by welding.
Dynamically balance impellers after any machine
work. To balance remove metal from the front or
back shroud of the impeller at the point of
unbalance
6.8.3 Mechanical seal
a) Mechanical seal stationary and rotating faces
should be inspected for signs of wear or cracks
and replaced as necessary.
b) It is recommended that when reassembling
mechanical seal new "O" rings and gaskets be
used.
c) Refer to manufacturers drawing for assembly of
mechanical seal. Refer to mechanical seal
section within this manual for further details.
6.8.4 Stuffing Box Bushings (If fitted)
a) Check the stuffing box bushes and replace if
cocked and /or worn.
b) To replace, chill the new bushings to -20°C and
install in the stuffing boxes
6.8.5 Shaft
When the pump is dismantled, examine the shaft
carefully. Its condition should be checked at the
impeller hub fit, deflectors and at the bearings. The
shaft may become damaged by rusting or pitting
because of leakage along the shaft at the impeller or
shaft sleeve. Anti-friction bearing improperly fitted to
the pump shaft will cause the inner race to rotate on
the shaft.
Check the shaft keyway for distortion.
Excessive thermal stresses or corrosion may loosen
the impeller on the shaft and subject the keyway to
excessive shock. Replace a shaft that is bent or
distorted. Check a shaft that has been repaired for
possible runout (maximum 0.050 mm).
The shaft sleeve is subject to wear and may require
replacement, depending on the severity of service
Replace if grooved, pitted or worn.
6.8.6 Gaskets and O-rings
After dismantling, discard and replace.
6.8.7 Bearings
6.8.7.1 Ball Ball
a) It is recommended that bearings are not re-used
after any removal from the shaft. In any case the
bearings must be replaced not after 25000
operating hours.
b) If the bearing cannot be removed with the tools
available never use a torch under any
