Speck pumpen BADU 42-AK Fiche Technique De Pre-Installation page 73

5.1.6 Fasteners

Fasten pump using screws.
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5.2 Pipes
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5.2.1 Pipe sizing
Suction lines which are too long have significant disadvantages:
• Higher resistance which results in reduced suction
performance and a higher risk of cavitation.
• Longer priming time, up to 12 minutes.
The dimensions which are specified in the pump data sheet only
apply to a pipe length of maximum 5 m.
For longer pipes, losses due to pipe friction must be taken into
account.

Size pipes according to the data in the tables. See pump
data sheet.
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5.2.2 Laying pipes

Keep the suction and pressure lines 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 intake mode: continuously falling.
– For suction operation mode: continuously rising.

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). Thus, the suction line
cannot drain when the pump isn't working and the priming
time remains short, for example after cleaning the basket.

If clogging is possible, for example 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 a shut-off valve in both the suction and pressure lines.

Avoid valves which close suddenly. Install a shock absorber
or air vessel if necessary.
10|2015
Installation
EN 17