It is only necessary to rectify the adjustment under base plate. If it proves to be insufficient, modify the motor and the piping.
Pump and motor mounted on individual base plates:
Machines are (or must be) first mounted on their own base plate in the workshop. Once the pump is set, it will be regarded as the fixed piece. Any alignment necessary shall be carried out on the motor.
Never connect the electric motor before the setting has been completely finished.
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 Suction and discharge piping
The dimensions of the pipes do not directly depend on suction and discharge diameters of the pump:
a)First, choose a flow speed < 2 m/s (7 ft/s) at suction, and about 3 m/s (10 ft/s) at discharge.
b)Take into account the available NPSH, which must be superior to the required NPSH of the pump.
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. These external strains may cause misalignment, hot bearings, worn couplings, vibrations and the possible failure of the pump casing.
When designing the pipes (§ 4.5.2.1, § 4.5.2.2, § 4.5.3.1) take necessary precautions in order not to exceed maximum allowed strains.
Forces and moments applied to the pump flanges must never exceed the values shown in the following table:
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| Suction | Discharge |
| Forces | Moments | |||||||||||||||||||||||||||||||
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| Fv |
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| Fh | ||||||||||||||||||||||||||||||
Pump type |
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| DNA |
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| DNR |
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| Mt max | |||||||||||||||||||||||||
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| max |
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| max | ||||||||||||||||||||||||||||
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| mm |
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| mm | daN |
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| daN | m.daN | ||||||||||||||||||||||
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| (in.) |
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| (in.) | (lbf) |
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| (lbf) | (lbf.ft) | ||||||||||||||||||||||
100 |
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| 65 | 140 |
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| 105 |
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| 27 | |||||||||||||||||||||||||
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| (2”1/2) | (315) |
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| (236) |
| (199) | ||||||||||||||||||||||||
125 |
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| 100 | 180 |
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| 125 |
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| 47 | |||||||||||||||||||||||||
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| (5”) |
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| (4”) | (405) |
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| (281) |
| (347) | |||||||||||||||||||||||||
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Forces and moments values are applied to the whole flanges and not flange
Ensure piping and fittings are flushed before use.
Ensure piping for hazardous liquids is arranged to allow pump flushing before removal of the pump.
4.5.2 Suction piping
4.5.2.1 Design of a flooded suction line
The suction line must be as short and direct as possible, never mount an elbow directly on the inlet flange of the pump.
Valve
Non return valve
Motor
Continuous flow valve
Baseplate | Coupling guard |
| Coupling |
Flooded suction configuration
a)Avoid sharp elbows or sudden narrowing. Use convergent 20° (total angle).
b)Arrange the piping so that there are no air pockets (no bulges).
Page 15 of 28 | flowserve.com |