Wilo SCP Série Notice De Montage Et De Mise En Service page 57

7.2.4 Pipe work
No stress must be imposed on the pump casing by
the pipe work; neither by the weight of the pipes
nor by the tightening of badly fitting pipes
(figure 6). All pipe worked attached to the pump
must be fully supported and the mating faces of
the pipe flanges must be parallel and all bolt holes
coinciding with each other. (see table of maximum
forces on flanges) It is important ,therefore, that
alignment of the pump and motor should be re-
checked after the pipes are finally fitted. Reset-
ting or supporting the pipes must correct any
deviation in the alignment.
MAXIMUM ALLOWABLE FORCES & MOMENTS ON SCP PUMPS, FLANGES IN CAST IRON
Forces [N] and moments [Nm]
Nominal Sizes of Flanges
Forces (N) and Moments (Nm)
Flange size 50
[mm]
Each side Fx 710
nozzle
Fy 890
Fz 580
Fr 1280
Each nozzle Mx 460
My 230
Mz 350
Mr 620
Installation and operating instructions Wilo-SCP
65 80 100 150
890 1070 1420 2490
1130 1330 1780 3110
710 890 1160 2050
1640 1920 2560 4480
690 950 1330 2300
435 470 680 1180
530 720 1000 1760
970 1280 1800 3130
Avoid stress on the pump casing
a: pump flange; b: pipe work
For difficult pumping on the suction side, to stabi-
lise the flow, a pipe length 15 times the diameter
of the suction branch should be installed before
the suction branch.
• The flow rate in the suction line or inflow line must
not exceed 2 - 3 m/s.
• Pipe velocity may need to be reduced further to
satisfy pump NPSH requirements and to control
suction pipe losses (refer figure 6).
200 250 300 350
3780 5340 6670 7120
4890 6670 8000 8900
3110 4450 5340 5780
9620 9630 11700 12780
3530 5020 6100 6370
1760 2440 2980 3120
2580 3800 4610 4750
4710 6750 8210 8540
English
400 450 500
8450 9335 10000
10230 1115 7780
6670 7335 7890
14850 16230 17650
7320 7675 7945
3660 3905 4175
5420 5725 6060
9820 10235 10775
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