Torques For Inlet And Outlet Flanges - Grundfos SE Instrucciones De Instalación Y Funcionamiento

Recommendation for pump foundations
This applies for pumps above 20 hp (15 kW).
All rotating equipment generates vibrations when an impeller or
rotor is turning at high speeds. Proper installation and anchorage
of the pumps and installation accessories is critical to limit
vibrations and achieve reliable installation. To ensure acceptable
vibration levels in the field, all parts of the system must be
sufficiently stiff and firmly anchored to minimize vibrations:
• The foundation and concrete must be of adequate strength to
support the weight of the pump including accessories, the
weight of the liquid passing through the pump, and the forces
generated by the pump.
• The mass of the concrete foundation must be a minimum of
three to five times the mass of the supported equipment and
must have sufficient rigidity to withstand the axial, transverse,
and torsional loadings generated by these machines.
• The foundation must be 5.9 in (15 cm) wider than the
baseplate for pumps up to 469 hp (350 kW) and 9.8 in (25 cm)
wider for larger pumps.
• The concrete used in the foundation must have a minimum
2
tensile strength of 362 lbf/in
• Always use epoxy grout to fasten the pump base plate to the
foundation.
We recommend that you use a reducer between the
inlet pipe and the pump in horizontal installations.
The reducer must be of the eccentric type and must
be installed so that the straight edge is upwards. This
will prevent the accumulation of air in the inlet pipe
and eliminate the risk of disturbance of operation.
See fig. 7.
≥ 0.65 ft
(0.2 m)
Reducer of the eccentric type
Fig. 7 Eccentric reducer in horizontal installation
4.1.5 Temporary, vertical, submerged installation in a pit
Proceed as follows:
1. Fit the ring stand to the pump inlet flange.
2. Fit a 90 ° elbow to the pump outlet port and connect the outlet
pipe or hose.
If a hose is used, make sure that the hose does not buckle
and that the inside diameter matches that of the outlet port.
3. Lower the pump into the liquid by means of a chain secured to
the lifting bracket of the pump. We recommend that you place
the pump on a level, solid foundation.
8
2
(250 N/cm ).
During lowering, make sure that the pump is hanging
from the chain and not the cable.
4. When the pump is placed firmly on the bottom of the pit,
attach the end of the chain to a suitable hook at the top of the
pit in such a way that the chain cannot come into contact with
the pump housing.
5. Adjust the length of the power cable by coiling it up on a relief
fitting to ensure that the cable is not damaged during
operation. Fasten the relief fitting to a suitable hook. Make
sure that the cable is not sharply bent or pinched.
6. Connect the power cable and the control cable, if any.

4.1.6 Torques for inlet and outlet flanges

Grade 4.6 (5) galvanized steel bolts and nuts
Pitch
Nominal
circle Bolts
diameter
diameter [in (mm)]
[in]
[in]
2 1/2" 5 1/2" 4 x 5/8" (M16)
3" 6" 8 x 5/8" (M16)
4" 7 1/2" 8 x 5/8" (M16)
6" 9 1/2" 8 x 3/4" (M20) 100 (140)
2 1/2" 5 1/2" 4 x 5/8" (M16)
3" 6" 8 x 5/8" (M16)
4" 7 1/2" 8 x 5/8" (M16)
6" 9 1/2" 8 x 3/4" (M16) 90 (120)
Specified tightening torques rounded off by ± 5.
Grade A2.50 (AISI 304) steel bolts and nuts
Pitch
Nominal
circle Bolts
diameter
diameter [in (mm)]
[in]
[in]
2 1/2" 5 1/2" 4 x 5/8" (M16)
3" 6" 8 x 5/8" (M16)
4" 7 1/2" 8 x 5/8" (M16)
6" 9 1/2" 8 x 3/4" (M20)
2 1/2" 5 1/2" 4 x 5/8" (M16)
3" 6" 8 x 5/8" (M16)
4" 7 1/2" 8 x 5/8" (M16)
6" 9 1/2" 8 x 3/4 (M20)
Specified tightening torques rounded off by ± 5.
The gasket must be a full-face, reinforced paper
gasket like Klingersil C4300. If you use a softer
gasket material, reconsider the torques.
Torques
[ft.lbs (Nm)]
Slightly Well
oiled lubricated
50 (70) 45 (60)
50 (70) 45 (60)
50 (70) 45 (60)
90 (120)
50 (70) 45 (60)
50 (70) 45 (60)
50 (70) 45 (60)
80 (100)
Torques
[ft.lbs (Nm)]
Slightly Well
oiled lubricated
- 45 (60)
- 45 (60)
- 45 (60)
- 90 (120)
- 45 (60)
- 45 (60)
- 45 (60)
- 80 (100)