ITT Goulds Pumps SSV Serie Instrucciones De Instalación, Operación Y Mantenimiento página 6

• If pump is installed above the liquid source, the following MUST be
provided:
• To avoid air pockets, no part of the suction piping should be
above the pump suction.
• On any horizontal piping sections, slope piping upward from
liquid source.
• All suction pipe joints MUST be airtight.
• Use a foot valve for priming, or for holding prime during
intermittent duty.
• The suction strainer or suction bell MUST be at least 3 times the suction
pipe diameter.
• Insure that the size and minimum liquid submergence, over the suction
inlet, is sufficient to prevent air from entering through a suction vortex.
See typical suction piping Figures 2 through 5.
• Install a discharge check valve, suitable to handle the flow and liquids,
to prevent backflow.
• Install an appropriately sized gate valve, AFTER the discharge valve, to
regulate the pump capacity, for pump inspection and for maintenance.
• When a pipe increaser is required, install between the check valve and
the pump discharge.
Figure 2
D
8D
min.
4D
H min.
min.
3D
3D
2
Figure 4
6
H min.
D
H
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 V
min.
3D
V = Velocity in feet per second
=GPM x 0.321
H min.
D
Figure 3
GPM x 0.4085
Area 2
D
Figure 5