Overhaul Maintenance; Acceptable Field Vibration Limit Chart - Wilo -SCP Installation And Operating Instructions Manual

9.2 Overhaul maintenance

9.2.1 General information
After a long period of service, wear will occur in parts of the
pump, necessitating the renewal of a few components.
Logbook records will indicate wear as gradual deterioration of
performance is noticed. Once this is known, pumps should be
taken for overhaul. It is recommended that yearly stripping &
checking of wear & tear and clearances should be done and
overhauling where required.
If related pair of components show a marked degree of wear in
relation to the rest of the unit, then it may be sufficient to renew
only the heavily worn components. If the wear is uniform
throughout the pump, then all wearable components may
require renewal.
Measurements should be taken and recorded of all wearable
components at the first, and every subsequent overhaul period.
Reference to these records will enable an accurate assessment
of the rate of wear to be made, and a reasonably accurate
forecast regarding when a particular component may require
renewal can be made.
NOTE:
The figures given in the table above are only valid if the wear
rings and the impeller are made with in the same materials of low
galling tendencies. For materials with higher galling tendencies
(AISI 304/
316 etc...), higher clearance is provided (0.125 mm to be added
to given values).
Information regarding original design dimensions and clearances
is furnished in data sheet. Any other information, if needed, can
be requested from Service Department, WILO SE.
Tightening torques – Untreated Screw (black finish); Coefficient of Friction 0.14
Property Torque
class
HTS
Nm 9.2 22
8.8 Ft. lb 6.8 16 32.5
SS304 Nm 4.1 9.8 19.5
Class 50 Ft. lb 3
9.2.2. Hydraulic Institute Standard (ANSI/HI 9.6.4-2016)
Acceptable field vibration limit chart (9.6.4.2.5.1b)
Installation and operating instructions WILO-Split Case Pumps
Nominal diameter – Coarse thread
M6 M8 M10 M12 M14 M16 M20
44 76 122
56 90
34 54.1 84.4 164.7
7. 3 14 4 25 39.9 62.3 121.4 165.2
Such request must quote name plate number and type of the
pump in question.
The parts most likely to be affected are:
• Impeller
• Mechanical seal
• Neck Rings
• Sleeves
• Stuffing Box Bush
• Bearings
• Coupling Bushes/ membrane set
Before commencing dismantling operations, ensure that the
following tools and tackles are available:
• A crane / chain pulley block suitable for handling the weight
of pumping unit.
• A selection of ring and open-ended spanners in Metric sizes.
• Eyebolts in British and Metric sizes.
• Cotton rope, wire rope and slings.
• Hardwood and metal packing blocks.
• Miscellaneous tools including a set of Allen keys, drills, pin
drivers, files etc.
• Extractor / puller for bearing and coupling.
The torque value to be set for a particular size of screw is
dependent upon:
• Material of screw
• Parent metal
• Whether the screw is untreated or plated
• Whether the screw is dry or lubricated
• The depth of the thread
M22 M24 M27
190 300 350 500
140 221 258 369
224 285
209
M30 M33 M36
600 1450 1970 2530
443 1069 1452 1865
416.5 565.6 1769.6 988.4
307.1 417.1 1567.6 728.9
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