Operating manual X9 Series metering pumps
File: UT-4336 – Rev.0 Copyright © - OBL Metering pumps - All rights reserved Page 17
GB
6.2.2
Suction pipeline for viscous liquids
Pumps for dosing viscous liquid must be specifically ordered for that use.
Where possible, we recommend:
- use stainless steel pumpheads, otherwise with metallic valves or special material
- maintain the diameter corresponding to pump connections as the minimum diameter of the suction pipe
As a general rule, always install the pump with suction connection flooded and pay particular attention to the
design, arrangement and path of suction pipeline.
ATTENTION: To select a suitable pump the customer must inform us on the plant NPSH available !
Figure 6 shows some installation examples for viscous liquids.
Figure 6 INCORRECT INSTALLATION CORRECT INSTALLATION
6.2.3
Filter on suction pipeline
To ensure proper pump operation it is important that the product dosed is liquid, homogeneous and clean.
Recommended
5-G
Recommended
Recommended
Acceptable
5-H
6-A
6-B
6-C
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