5 piping – Flowserve NM User Manual
Page 16
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.