Pipes; Pipe Sizing; Laying Pipes - Speck BADU 93 Manual De Uso

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.
NOTICE
If the suction line leaks, the pump will prime poorly or not at all.
04|2017
Installation
EN 17