Voith IPC 4, Operating Instructions Manual

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37
Voith
Turbo H + L
Hydraulic GmbH & Co. KG
25000057510-TED-ENX-04
11 Voith internal gear pumps in
operation
This section describes indications of pump wear, and the measures necessary to fix
them.
11.1 Operating data
Protect the pumps during operation by effectively filtering the pressure fluid
to prevent any foreign bodies entering the system (see chapter 17.8)!
11.1.1 Factors that influence the loss of pressure in
the suction piping during operation
If the input pressure falls below the pressure specified in chapter 5.2, check the
following points:
• the flow speed in the suction piping (speed changes) the suction height (level
difference changes between the oil level and pump),
• the suction filter (increased filter contamination),
• the oil viscosity (oil temperature changes),
• the suction cross-section (if necessary, the suction valve opening, and whether
the valve was fully open).
11.1.2 Suction pressure
During operation with mineral oil, the input pressure in the suction nozzle of the
pump must be between 0.8 and 3 bar (measured as the absolute pressure).
During start-up mode, an absolute pressure of up to 0.6 bar is permitted temporarily.
In the suction piping, the flow speed of 1 m/s (in suction mode) or 1.5 m/s (inlet with
slight over-pressure of up to 3 bar max.) must not be exceeded! Risk of cavitation!
The flow speed is only intended as a reference guide. The key factor is the suction
pressure!
Internal gear pumps
Operation
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