minimum thickness of fabricated material for the FSI
should be:
MINIMUM
EXIT DIAMETER OF FSI
THICKNESS
mm (in.)
mm (in.)
Up to and including 450 (18)
10 (3/8)
From 450 (18) to and
including 900 (36)
13 (1/2)
From 900 (36) to and
including 1350 (54)
16 (5/8)
From 1350 (54) to and
including 2100 (84)
19 (3/4)
When a FSI is used, paragraphs SUCTION BELL and
IMPELLER BOWL should be changed to coordinate with
the FSI requirements.
The thickness of the rubber gasket shall be as
follows:
FSI EXIT DIAMETER
THICKNESS
mm (in.)
mm (in.)
Up to and including 1200 (48)
13 (1/2)
From 1200 (48) to and
including 2100 (84)
19 (3/4)
**************************************************************************
[Sump has been designed using information obtained by sump model testing.
Changes to sump layout will not be permitted.]
[Formed Suction Intake (FSI):
a.
Provide FSI water passage with pump, sized to fit within limiting
elevations and dimensions shown. No bearing shall be located
below the impeller when FSI is used.
b.
Dimensions of intake elbow and conical transition section of FSI
are relative to diameter at the top of cone, as defined on
drawings. Diameter at top of cone and related dimensions are
determined to accommodate the size of pump, providing limiting
values for discharge and submergence are not exceeded, floor of
the FSI remains at elevation [_____], and impeller datum is set no
higher than elevation [_____]. Rectangular transition section of
the FSI upstream of elbow can be modified in length to match width
of individual pump bay or sump intake. Modification shall be
limited to surfaces and dimensions indicated, and shall be
approved.
c.
Construct FSI of [fabricated steel,][ cast iron,][ cast steel,][
or a combination of these materials embedded in concrete][formed
concrete as indicated]. Stiffeners used shall be on outside of
the FSI to allow smooth flows in the FSI. Size subassemblies of
the FSI, unless constructed of formed concrete, to permit
placement and removal through [hatch in operating floor] [pump
opening in operating floor] [through sump gate and trashrack].
Bolts used to connect flanges shall be stainless steel with bronze
SECTION 15131A
Page 27
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