Installation Of A Flange-End Pump - Wilo TOP-Z Serie Instrucciones De Instalación Y Funcionamiento

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7.1.2 Installation of a flange-end pump

Installation of pumps with combination flange PN6/10
(Flange-end pumps DN 40 up to and including DN 65)
WARNING! Risk of injury and damage to property!
The flange connection can be damaged and develop leaks if the pump is not
installed correctly. There is a risk of injury and damage to property due to hot
fluid escaping.
• Never connect two combination flanges to each other!
• Pumps with combination flanges are not suitable for operating pressures
PN16.
• The use of securing elements (e.g. spring rings) can result in leaks at the
flange connection. They are therefore not permitted. 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 (
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).
DN 40, 50, 65
Screw diameter
Strength class
Permitted tightening torque
Min. screw length for
• DN 40
• DN 50/DN 65
DN 80
Screw diameter
Strength class
Permitted tightening torque
Min. screw length for
• DN 80
34
≥
Rated pressure PN 6
M12
≥
4.6
40 Nm
55 mm
60 mm
Rated pressure PN 6
M16
≥
4.6
95 Nm
65 mm
4.6) are used, since otherwise
Rated pressure PN 10/16
M16
≥
4.6
95 Nm
60 mm
65 mm
Rated pressure PN 10/16
M16
≥
4.6
95 Nm
65 mm
WILO SE 12/2013