Pipes; Pipe Sizing; Laying Pipes - Speck pumpen BADU 90 Fiche Technique

5.2

Pipes

5.2.1

Pipe sizing

Suction lines which are too long have significant disadvantages:
The dimensions which are specified in the pump data sheet apply only
to a pipe length of max. 5 m.
For longer pipes, losses due to pipe friction must be taken into account.
5.2.2

Laying pipes

Note: If the suction line leaks, the pump will prime poorly or not at all.
06/2014 VG 766.2000.055
Higher resistance which results in less efficient priming and a higher
risk of cavitation.
Longer priming time, up to 12 min.
Size pipes according to the data in the tables. See pump data
sheet.
Keep the suction line as short and straight as possible.
Avoid sudden changes to the cross-section and direction.
If possible, lay the suction line below the water level.
Lay the suction line as follows to prevent air pockets from forming:
– For gravity feed: continuously falling.
– For suction operation: continuously rising but below water level.
If the pump is installed above the water level, install a foot valve in
the suction line. Required for non self-priming pumps,
recommended for self-priming pumps. With it, the suction line
cannot drain when the pump isn't working, and the priming time
stays short, e.g. after cleaning the basket.
If clogging is possible e.g. with straw or grass, install a filter in the
intake or the suction line.
Depending on the type of pump and system, install a non-return
valve as necessary.
Install valves in both the suction and pressure line.
Avoid valves which close suddenly. Install shock absorber or air
vessel if necessary.
Ensure the suction line does not leak and make sure that the cover
is screwed on tightly.
5 Installation
EN 41