Goulds Pumps 3410 - IOM - Manual (Page 14)

DOUBLE VOLUTE CASINGS
4x6-11 8x10-21
4x6-11H 10x12-12
6x8-11 10x12-12H*
8x10-12 10x12-14
8x10-14 10x12-17
8x10-17 10x12-15
8x10-17H 12x14-14
12x14-15
*Casing uses a partial splitter.
125# flat face flanges are standard with 250# flat face
available as an option. The casings are standard with two
jack screws (except S group), two lifting lugs, two tapered
dowel pins for alignment, and a 0.030 inch (.0762 cm)
parting gasket.
The upper half casing is provided with a vent connection, a
priming connection, and two stuffing box seal ring
connections. The lower half is provided with two drain
connections.
Impeller - The impeller is an enclosed, double suction
design providing axial hydraulic balance. The impeller is
dynamically balanced as standard when the diameter to
width ratio is less than six. The impeller is key driven.
Wear Rings - Casing wear rings are supplied as standard to
maintain proper running clearance and to minimize leakage
between the suction and discharge chambers in the casing.
Each casing ring is held in place by a single anti-rotation
pin, located in a milled slot at the horizontal parting
surface. Optional impeller wear rings are available on all
pump sizes. The impeller wear rings are held in position by
axial set screws. Field installation of impeller rings requires
a remachining of the impeller hubs. The casing rings
remain the same for both the less-impeller ring and
with-impeller ring designs.
Shaft - The shaft is a heavy duty design that minimizes
deflection and vibration. The shaft deflection is a maximum
of .002 in (.005 mm) at the stuffing box face under the
worst operating conditions. The shaft on the M, L and XL
group pump is completely dry with gasket seals between
the impeller hubs and shaft sleeves. The S group does not
have a completely dry shaft. The S group is standard with a
420 stainless steel shaft. The M, L, and XL sizes have an
ANSI 4140 steel shaft standard, with an option for 316
stainless steel.
Shaft Sleeves -T he M, L and XL group pumps have
standard Shaft Sleeves. They are keyed to the shaft at the
impeller and held axially in place using threaded sleeve
nuts. The S group pumps are standard without shaft
sleeves, but sleeves are available.
Stuffing Box - Non-asbestos stuffing box packing is
standard. The stuffing box contains split lantern rings and
renewable stuffing box throat bushings. Tapped openings
are provided for water sealing from either the pump casing
or an outside source. Bypass piping is optional. Two-piece
investment cast 316SS non-quench glands are standard on
all 3410 pumps.
Mechanical Seals - Mechanical seals are available as an
option on the Model 3410. Oversize stuffing box bores are
standard on pumps provided with factory installed
mechanical seals, providing greater flexibility and an
improved operating environment.
Pumps which are originally supplied with standard packed
boxes can be converted to mechanical seals in the field.
This conversion requires either a remachine of the stuffing
boxes or a gland remachine to adapt to the existing stuffing
boxes. Remachining of the stuffing box bores allows use of
all standard Model 3410 mechanical seals and the standard
I.D. pilot glands. Conversion to stepped sleeves would be
required for balanced seals. Most unbalanced mechanical
seals will fit in the standard packed box bores, but this
requires remachining the I.D. pilot off the glands. In this
case, the glands must be centered on the shaft or sleeve
utilizing a feeler gauge.
Pumps supplied with mechanical seals can also be
converted to packed boxes in the field. A cartridge
conversion kit is available and includes a box of fittings,
plus sleeves to convert to oversize bores to standard packed
box bores.
Bearings - The Model 3410 is standard with double row
ball thrust bearings and a single row deep groove ball
bearing at the coupling end. There are only two sizes of
bearing housings and bearings utilized on the complete
Model 3410 product line. The S and M groups utilize
identical bearings, as do the L and XL groups. The thrust
bearing is held in position with a tapered snap ring and is
locked in the thrust bearing housing to take any unbalanced
axial thrust load. The radial bearing is free to float axially
in the bearing housing taking radial loads only.
Grease lubrication is standard. Oil lubrication is optional
and utilizes the same shaft, bearings, and bearing housings.
Bearing cooling is available with oil lubrication only, and
is required for temperatures over 250 degrees F (121
degrees C). The bearing housings are completely sealed by
Inpro VBS bearing isolators.
Bedplates - Cast iron bedplates are furnished as standard.
They include a drip collection chamber with a tapped drain
connection and an opening suitable for grouting. Fabricated
steel bedplates are available as an option.
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3410 IOM 1/2010