Flowserve VF - Manual (Page 17)

VF USER INSTRUCTIONS ENGLISH 71561233 - 11/09
Page 17 de 32
4.4.2 Alignment methods
Ensure pump and driver are isolated
electrically and the half couplings are
disconnected. Ensure that the pump pipe work,
suction and discharge, is disconnected.
The alignment MUST be checked.
Although the pump will have been aligned at the
factory it is most likely that this alignment will have
been disturbed during transportation or handling. If
necessary, align the motor to the pump, not the
pump to the motor.
Alignment
Parallelism and concentricity check
with a rule with a comparator
If the motor stool is fitted with a
screw adjustment, take 3 or 4 measurements at
different places.
Admissible margin for a motor with roller bearings
= 0.15 mm parallel checking
Otherwise: there are no coupling checks regarding
parallelism or concentricity. Owing to the design of
the machine the set is self-aligning.
4.5 Piping
The user must verify that the equipment is
isolated from any external sources of vibration.
Protective covers are fitted to the
pipe connections to prevent foreign bodies
entering during transportation and installation.
Ensure that these covers are removed from the
pump before connecting any pipes.
4.5.1 Discharge pipework
The dimensions of the pipes do not directly
depend on discharge diameter of the pump. First,
choose a flow speed about 3 m/s at discharge.
Never use pump as a support for
piping.
Do not mount expansion joints in
such a way that their force, due to internal
pressure, may act on the pump flange.
Maximum forces and moments allowed on the
pump flanges vary with the pump size and type.
Greater forces or moments may cause
misalignment, hot bearings, worn couplings,
vibrations and the possible failure of the pump
casing.
When designing the pipes (§ 4.5.2) take
necessary precautions in order not to exceed the
maximum allowed forces.
Forces and moments applied to the pump flanges
must never exceed the values shown in the table
below:
For pumps in steel or alloy steel:
DN 250 300 400 500 600 700
Fx 445 535 720 900 1080 1260
Fy 405 485 650 810 970 1130
Fz 500 600 800 1000 1200 1400
ΣΣΣΣ
F 785 940 1250 1560 1880 2195
Mx 220 300 480 710 1000 1320
My 270 360 580 870 1210 1550
Mz 190 260 420 610 860 1120
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ΣΣΣΣ M 390 530 860 1280 1800 2320
Fx 149 179 230 299 359 419
Fy 135 161 215 269 323 377
Fz 167 200 266 332 398 464
ΣΣΣΣ F 261 313 417 521 625 729
Mx 73 99 159 236 332 434
My 89 121 194 289 404 528
Mz 63 86 138 205 288 376
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ΣΣΣΣ M 131 178 286 426 598 782
F = Force in daN
M = Moment in m.daN
FR = Resultant force Mr = Moment resultant
For cast iron pumps: these values are to
be divided by 2.