12
6.7 Bypass orifice
A bypass should be installed in the discharge pipe if there is any
possibility the pump may operate against a closed valve in the
discharge line. Flow through the pump is required to ensure
adequate cooling and lubrication of the pump is maintained. See
6.9 Minimum continuous duty flow rates for minimum flow rates.
Elbows should be a minimum of 12” from the orifice discharge to
prevent erosion.
Fig. 7 Recommended bypass arrangement
Fig. 8 Optional bypass arrangement
Fig. 9 Optional bypass arrangement for CR(N) 32, 45, 64,
and CR 90, 120, and 150 only
6.8 Nozzle loads
If not all loads reach the maximum permissible value stated in the
forces and moments tables included here with fig. 10, one of
these values may exceed the normal limit. Contact Grundfos for
further information.
Fig. 10 Nozzle forces and moments
TM04 3926 0409TM04 3909 0409TM04 3924 0409
By-pass line
Nipple
Orifice
Inlet
Outlet
Inlet
Outlet
By-Pass Line
Nipple
Orifice
Outlet
Inlet
Nipple
Orifice
By-Pass Line
TM04 0346
Flange
CR, CRI,
CRN
Forces
Y-direction
[lb]
Z-direction
[lb]
X-direction
[lb]
1-1/4" 1s to 5 171 263 175
2"
10, 15
and 20
303 371 337
2-1/2" 32 382 466 422
3" 45 461 562 506
4" 64 and 90 607 753 674
5" & 6"
120 and
150
607 753 674
Flange
CR, CRI,
CRN
Moments
Y-direction
[ft-lb]
Z-direction
[ft-lb]
X-direction
[ft-lb]
1-1/4" 1s to 5 605 715 900
2"
10, 15
and 20
738 848 1,033
2-1/2" 32 793 904 1,106
3" 45 848 959 1,180
4" 64 and 90 922 1,069 1,291
5" & 6"
120 and
150
922 1,069 1,291
Y-direction: Direction of chamber stack
Z-direction: 90 ° from inlet/outlet
X-direction: Inlet/outlet
Grundfos.bk Page 12 Wednesday, March 18, 2009 10:38 AM
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