Flowserve NMD Manual do Utilizador descarregar pdf (Página 15)

NMD, NMAD USER INSTRUCTIONS ENGLISH 71576436 - 11/09

Page 15 of 40

4.3 Initial alignment

Before connecting the couplings

verify the motor rotation direction.

4.3.1 Thermal expansion

The pump and motor will normally

have to be aligned at ambient temperature and

should be corrected to allow for thermal expansion

at operating temperature. In pump installations

involving high liquid temperatures, the unit should be

run at the actual operating temperature, shut down

and the alignment checked immediately.

4.3.2 Alignment methods

Ensure pump and driver are isolated

electrically and the half couplings are disconnected.

Ensure that the pump pipework, 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:

Check the alignment at three or four

points, before pipeworks assembly.

with a rule with a comparator

Admissible margin for a motor with roller bearings:

= 0.15 mm parallel checking

= 0.1 mm angular checking

Angular checking:

with a sliding rule with a caliper gauge

The alignment will be definitive only

after pipework connection (see § 4.4.1).

Never connect the electric motor

before the setting has been completely finished.

4.4 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.

4.4.1 Suction and discharge pipework

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 at suction,

and about 3 m/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 (§ 4.4.2.1, § 4.4.2.2, §

4.4.3.1) 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 table

below:

Forces (daN) Moments (m.daN)

Pipework

arragement

flanges

∑ F

∑ M

100

50 40 45 80 18 20 25 37

125

62 55 55 100

22 26 31 46

150

75 60 81 120

22 31 37 55

200

100

81 90 157

34 39 48 72

250

125

100

112

195

43 49 60 89

Suction and

discharge

300

150

121

135

235

65 74 91 134

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 39 40

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