Vogelsang VX Series, Руководство пользователя

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Rotary lobe pump
Operating instructions
VX100Q, VX136Q..QD..QDM2, VX186Q..QD..QDM2, VX230Q..QD
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5.4.1 Suction lines
To protect from high pressure losses and cavitation, heed the advice for laying the
suction lines
•
The maximum suction height is 8 m. This is the maximum distance between the lowest and highest
points of the suction pipe. Observe NPSH.
•
Suction lines whose diameter is too small may restrict the suction capability of the pump. Caution
cavitation hazard!

If the diameter of the suction pipe is too small, the maximum suction height will be reduced by
the loss of pressure due to pipe friction. Contact us for a calculation

.
•
Suction lines over 30 m must be laid with a slope of at least 2 x pipe diameter in the direction of flow,
ensuring that the pipeline can never run dry

Fig.
“Long suction lines".
Fig. 15 : Long suction lines
5.4.2 Discharge pipes
Risk of injury from bursting parts and medium spraying out under high pressure
•
Follow recommendations for pipes. Only use high-pressure pipes on the discharge side:

up to nominal diameter DN 150 - PN 16 (bar) pipes

from nominal diameter 200 - PN 10 (bar) pipes, except when the permissible operating
pressure of the pump unit is
≥ 10 bar
If you are uncertain about anything, please contact us

.
•
During periods of inactivity and periods of hot weather, fermentation may occur in closed pipelines.
The resulting gas can result in a large pressure increase that can damage the pump or pump unit and
cause injury. Therefore, ensure that no medium is left in the pump.
•
A connection with sight glass has to be installed on the suction side. If the sight glass is on the
discharge side (during reverse pumping), the pressure may not exceed 2 bar

Fig.
“Flow direction
with pump units".