EBARA GMB GS Gebrauchs- Und Wartungsanleitung Seite 10

4. To reduce the effect of a water hammer, mount a check valve with spring.
EN
5. Suction systems:
- The bottom end of the suction pipe must remain submerged and at a depth of at
least twice the diameter of the pipe (2D) and at a distance from the bottom of 1
time to 1 and a half times the diameter (1~1.5 D).
- Fit a bottom valve with a filter at the beginning of the suction pipe to prevent the
entry of any foreign bodies.
- The suction pipe will be installed with an upward gradient towards the pump (of
more than 1%) to avoid the formation of air bubbles. The pipes and other acces-
sories must be connected in such a way so as not to create any air intake between
the different elements.
- Make sure that the suction pipe is as short and straight as possible and try to
avoid any unnecessary curves or additional length. Do not install any shut-off
valve in this section.
- Unless the installation project indicates something different, use the dimensions
for the suction pipe and eccentric reduction recommended in this Table. The
eccentric reduction will be installed with an upward gradient towards the pump to
avoid the formation of air bubbles.
DN suct. x DN
delivery
50 x 32
65 x 40
65 x 50
80 x 65
100 x 80
125 x 100
150 x 125
200 x 150
6. In systems where suction is operational:
- The installation of a shut-off valve is recommended in the suction pipe to facilitate
dismantling and overhauls.
- Install the suction pipe with an upward gradient towards the pump to avoid the
formation of air bubbles.
10
1500 RPM
DN pipe Reduction
65 65x50
80 80x65
100 100x65
125 125x80
150 150x100
200 200x125
250 250x150
300 300x200
Instruction and Maintenance Manual
3000 RPM
DN pipe Reduction
80
100
125
150
200 200x100
250 250x125
300 300x150
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80x50
100x65
125x65
150x80
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