5 piping – Flowserve NM User Manual

Page 16

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NM USER INSTRUCTIONS ENGLISH 71576289 - 11/09

Page 16 of 48

The alignment will be definitive only

after pipework connection (see § 4.5.1).

If necessary, improve the machine alignment:

Complete unit mounted on common base plate:

The machines are first aligned accurately in our
workshops. Usually, any misalignment observed on-
site is due to a wrong adjustment under the base
plate (disturbed during transport or because of
forces exerted by the pipework). It is only necessary
to rectify the adjustment under base plate. If it
proves to be insufficient, modify the motor and the
pipeworks adjustment.

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 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 (§ 4.5.2.1, § 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 table
below:

Forces (daN)

Moments (m.daN)

Pipes

layout

DN

flanges

F

Y

F

Z

F

X

F

M

Y

M

Z

M

X

M

32

30

40

35

60

23

27

34

49

40

30

40

35

60

23

27

34

49

50

40

50

45

80

27

30

37

54

65

50

68

58

102

30

33

40

60

80

60

75

70

120

32

36

44

65

100

80

100

90

160

36

41

50

74

125

100 125 110 200

44

52

63

92

150

120 150 135 240

53

62

75

110

200

162 200 180 314

69

79

97

144

250

200 250 224 390

86

99

121 180

300

242 300 269 470 129 148 182 267

350

300 375 336 586 192 221 270 400

Ve

rt

ic

a

l

p

ip

e

w

o

rk

p

e

rp

e

n

d

ic

u

la

r

to

t

h

e

s

h

a

ft

450

363 450 403 703 255 294 359 528

32

40

30

35

60

23

27

34

49

40

40

30

35

60

23

27

34

49

50

50

40

45

80

27

30

37

54

65

68

50

58

102

30

33

40

60

80

75

60

70

120

32

36

44

65

100

100

80

90

160

36

41

50

74

125

125 100 110 200

44

52

63

92

150

150 120 135 240

53

62

75

110

200

200 162 180 314

69

79

97

144

250

250 200 225 390

86

99

121 180

300

300 242 269 470 129 148 182 267

350

375 300 336 586 192 221 270 400

H

o

ri

z

o

n

ta

l

p

ip

e

w

o

rk

p

e

rp

e

n

d

ic

u

la

r

to

t

h

e

s

h

a

ft

450

450 363 403 703 255 294 359 528

Ensure piping and fittings are flushed

before use.

Ensure piping for hazardous liquids is

arranged to allow pump flushing before removal of
the pump.

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