Goulds Pumps ANSI FAMILY IOM (ATEX Compliant) - IOM - Manual (Page 37)

3. Reducers should be eccentric at the pump suction
flange with sloping side down and horizontal side
at the top (Figs. 23, 24, 25).
l
! CAUTION
Pump must never be throttled on suction side.
4. Suction strainers, when used, must have a net
“free area” of at least three times the suction pipe
area.
5. Separate suction lines are recommended when
more than one pump is operating from the same
source of supply.
Suction Lift Conditions
1. Suction pipe must be free from air pockets.
2. Suction piping must slope upwards to pump.
3. All joints must be air tight.
4. A means of priming the pump must be provided,
such as a foot valve, except for the 3796 self
priming pump.
Suction Head / Flooded Suction Conditions
1. An isolation valve should be installed in the
suction line at least two pipe diameters from the
suction to permit closing of the line for pump
inspection and maintenance.
2. Keep suction pipe free from air pockets.
3. Piping should be level or slope gradually
downward from the source of supply.
4. No portion of the piping should extend below
pump suction flange.
5. The size of entrance from supply should be one
or two sizes larger than the suction pipe.
6. The suction pipe must be adequately submerged
below the liquid surface to prevent vortices and
air entrainment at the supply.
ANSIFAM IOM - 5/08
35
Fig. 23
WITH TOP HORIZONTAL Fig. 24
Fig. 25
3