UB USER INSTRUCTIONS ENGLISH 71569247
®
1 – impeller
1 – diaphragm bush
(optional: 2 - mechanical seals 2 - impeller wear rings)
6.5 Tools required
A typical range of tools that will be required to maintain these pumps is listed below.
Readily available in standard tool kits, and dependent on pump size:
•Open ended spanners (wrenches) to suit up to M 24 (7/8 in.) screws/nuts
•Socket spanners (wrenches), up to M 24 (7/8 in.) screws
•Allen keys, up to 6 mm (¼ in.) A/F
•Range of screwdrivers
•Soft mallet
More specialized equipment:
•Bearing pullers
•Bearing induction heater
•Dial test indicator
•
(If difficulties in sourcing are encountered, consult Flowserve.)
6.6 Fastener torques
Bolt size |
| Torque Nm (lbf·ft) |
| ||
Pump feet | All other | ||||
| |||||
| fasteners | fasteners | |||
M8 (5/16 in.) |
| - | 10 (7) | ||
M10 (⅜ in.) |
| - | 20 | (15) | |
M12 (½ in.) | 63 | (46) | 34 | (25) | |
M16 (⅝ in.) | 170 | (125) | 84 | (62) | |
M20 (¾ in.) | 340 | (250) | 165 | (120) | |
M24 (⅞ in.) | 590 | (435) | 285 | (210) | |
6.7 Renewal clearances
As wear takes place between the impeller, casing ring and diaphragm bush the overall efficiency of the pump set will decrease. To maintain optimum efficiency it is recommended that rings and bush are replaced and the impeller renovated when the radial clearance detailed in section 3.4.2 has doubled.
6.8 Disassembly
Refer to section 1.6, Safety, before dismantling the pump.
Before dismantling the pump for overhaul, ensure genuine Flowserve replacement parts are available.
To dismantle the pump consult the sectional drawings. See section 8, Parts lists and drawings.
a)Isolate motor and lock off electrical supply in accordance with local regulations.
b)Isolate suction and discharge valves.
c)Remove coupling guards and disconnect the coupling halves.
d)Drain pump casing. Remove any auxiliary piping if applicable.
e)Release the copper lockwasher securing the coupling nut and remove the pump half coupling.
f)Unbolt the glands/seal covers from the casing. If glands are split type, remove completely.
g)With a suitable punch, drive out the two locating dowels which are used on the horizontal split flange to align the upper and lower half casings.
h)Remove the bolts, which hold the upper and lower half of the casing together, and remove the upper half. Tapped holes are provided in the joint flange to enable the use of forcing bolts to loosen the joint.
i)Lift the casing upper half using the two eye bolts provided.
Do NOT use this method to lift the bottom half or complete pump casing.
j)Remove the 6 – screws securing each bearing bracket to the bottom half casing.
k)Lift out rotor assembly. Use care in slinging, handling and supporting of the rotor for subsequent dismantling. Place rotor securely on two support blocks.
l)When removing the rotor assembly, the casing rings and diaphragm plate will be loosely attached to the rotor.
m)Remove bearing covers and slide bearing housings off bearings.
n)Release the copper lockwasher securing the bearing locknut at the
o)Depending on configuration remove glands/seal covers, packing and lantern ring/mechanical seal.
Refer to any special instructions supplied with the mechanical seal.
p)Remove the two socket head screws securing each shaft sleeve nut. Using
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