Operating manual
AQUA S.p.A.
ENGLISH
Page 14
Filling system
Counter pressure valve
Filter
Interception valve
SUCTION PIPE
•
Pipe length should be reduced at minimum and be as linear as possible, using, where necessary, high range turns. In any case the
maximum total length of all suction sectors should not exceed 2,5 metres;
•
Never exceed 1,5 m of suction height in case of overhead installations;
•
Presence of air bubbles on suction pipe compromises the pump priming. Avoid syphon turns and fluid interruptions. Take special
attention to perfect seals tightening;
•
Maximum liquid velocity can’t exceed 0,7 m/s for viscosity until 100cPs.
•
Inner diameter of suction pipe must be chosen considering pump flow meter, according to the below chart::
Maximum pump flow rate l/h
Nominal recommended Ø
Qmax < 15
Ø 6 mm
15 l/h < Qmax < 30
Ø 10 mm
30 l/h < Qmax < 125
Ø 16 mm
125 l/h < Qmax < 155
Ø 20 mm
155 l/h < Qmax < 260
Ø 25 mm
260 l/h < Qmax < 500
Ø 32 mm
Qmax > 500
Ø 40 mm
Note: In case of viscous liquid, keep as minimum suction pipe diameter the same of the pump connections.
For an optimal suction line installation, consider the indications show in the below drawings:
WRONG
CORRECT
FLUID GETS INTERRUPTED IN THE UPPER PART OF PIPING
