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38 Salmson 02/2012
7.1.2 Installation of a flanged pump
Installation of pumps with PN6/10
combination flange (flange-end pumps D32 up to DN 65 inclusive)
WARNING! Risk of injury and material damage!
The flange connection can be damaged and develop leaks. There is an injury
hazard/risk of damage by the escape of a hot fluid.
• Never connect two combination flanges to each other!
• The use of securing elements (e.g. spring rings) can leads to leaks at the
flange connection. They are therefore not permissible. The washers supplied
(Fig. 3, item 1) must be inserted between screw heads/nuts and the combi-
nation flange.
• The permissible tightening torques listed in the table below must not be
exceeded, even if screws of higher strength (
4.6) are used, since otherwise
splintering can occur at the edges of the long holes. This causes the screws
to lose their preload and the flange connection can become leaky.
• Use screws of sufficient length. The screw thread must protrude at least one
thread turn beyond the nut (Fig. 3, item 2).
• Install appropriate flat gaskets between pump and counter flanges.
• Tighten the flange bolts across diagonals in two steps to the prescribed tight-
ening torque (see Table 7.1.2).
• Step 1: 0.5 x permissible tightening torque
• Step 2: 1.0 x permissible tightening torque
• Check the flange connections for leaks.
DN 32, 40, 50, 65 Rated pressure PN 6 Rated pressure PN 10/16
Screw diameter M12 M16
Tensile strength class 4.6 4.6
Permitted tightening torque 40 Nm 95 Nm
Min. screw length for
• DN 32/DN 40 55 mm 60 mm
• DN 50/DN 65 60 mm 65 mm
DN 80, 100 Rated pressure PN 6 Rated pressure PN 10/16
Screw diameter M16 M16
Tensile strength class 4.6 4.6
Permitted tightening torque 95 Nm 95 Nm
Min. screw length for
•80 65mm 65mm
• 100 70 mm 70 mm
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