INSTALLATION
DESMI Pumping Technology A/S
Tagholm 1
9400 Nørresundby
– Denmark
Tlf. nr.: +45 96 32 81 11
Fax +45 98 17 54 99
E-mail: [email protected]m
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• Service areas and lifting points for motor and pump
• Pipe medium flow
• Optimum operating range
• Electrical connections (cables and screw assemblies)
• Electrical interference
• Using Common Mode filter for minimizing bearing currents when installing frequency convert
Pipe system before pump
–
suction line
DS13930/13932 recommends length of suction pipe
”X” before the pump is around 3 to 5 x pipe
diameter. For a DN100 pump, this will be equivalent to X=300 to 500mm. This rule of thumb
ensures laminar flow before and after the pump that will give optimum operating conditions. But in
practice, there are many installations where this is not obtained.
X= minimum length of suction pipe before flow-changing components.
Flow-changing components:
• Compensators
• Valves
• Filters
• Bends
• Orifice plate
• Etc.
Ensure a solid base plate to minimise vibrations and extend service intervals.
Avoid 90-degree bends, T-pieces or other components that can impede flow on the pump suction
side.
Avoid radius of curvature of less than 1.5 times the nominal pipe diameter.
Avoid abrupt changes of cross-section along the piping system.
Gentle curves or Y-pieces to ensure optimum flow before (and after) the pump are best.
Use shims between pump base plate and foundation to avoid tension in the pump foot when the
installation is secured.
Summary of Contents for NSL 100-215
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