Goulds Pumps 3420 - IOM - Manual (Page 15)

GENERAL INFORMATION
PUMP DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
NAMEPLATE INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
RECEIVING THE PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
PUMP DESCRIPTION
The model is based on 8 bearing configurations and 15 hydraulic sizes. Groupings are as follows:
The model 3420 is a horizontal between bearings, enclosed
impeller double suction centrifugal pump.
Casing - The casing is horizontally split. The upper and
lower halves are held together with studs and nuts and/or
capscrews. Flanged suction and discharge connections are
located in the lower half of the casing and conform to ANSI
16.1/16.5 class 125/150. The casing is supported by
integrally cast feet. Separate bearing housings are attached
directly to machined fits in each end of the casing with
capscrews or machined fits secured with bearing caps and
studs and nuts. All sizes have dual volute casings to reduce
radial loads on the shaft. The casings are standard with two
jacking screws, two lifting lugs for the upper half, two
tapered dowel pins for alignment, and a .030 or .016 in. (.75
or .41 mm) non-asbestos parting gasket. The upper half is
provided with a vent connection, a priming connection, and
one or two stuffing box seal ring connections. The lower half
is provided with two drain connections, suction and
discharge gauge connections, and stuffing box overflow
connections.
Impeller - The impeller is an enclosed, double suction design
providing axial hydraulic balance. All exterior surfaces are
fully machined. The impeller receives a one or two plane spin
balance as standard. The impeller is keyed to the shaft and
held in place using shaft sleeves and sleeve nuts.
Wear Rings - Casing and impeller wear rings are supplied as
standard to maintain proper running clearances and to
minimize leakage between the suction and discharge
chambers in the casing. Each casing ring is held in place with
3420 IOM 8/09
7
1
Group Description Sizes
SX
Ball radial and duplex ball thrust bearings. Flood oil lube with constant level oiler optional grease
lube. Bearing housings bolt to the casing. Goulds non-metallic labyrinth seals. 12 x 14-15
16 x 18-17H
MX
Ball radial and duplex ball thrust bearings. Flood oil lube with constant level oiler optional grease
lube. Bearing housings bolt to the casing. Goulds non-metallic labyrinth seals.
18 x 20-20
M
Ball radial and duplex ball thrust bearings. Ring oil lube with constant level oiler optional grease
lube. Bearing housing secured with tongue and groove fits and a bearing cap with studs and nuts.
Goulds metallic labyrinth seals.
16 x 18-30
18 x 20-30
20 x 24-24
20 x 24-30
M
(modified)
Same as M group except the shaft is longer to accommodate a wider pump. 20 x 24-28
—
Ball radial and duplex ball thrust bearings. Ring oil lube with constant level oiler, optional grease
lube. Bearing housing secured with tongue and groove fits and a bearing cap with studs and nuts.
Goulds metallic labyrinth seals.
18 x 20-24
L
Double row roller bearings, both thrust and radial. Ring oil lube with constant level oiler, optional
grease lube. Bearing housing secured with tongue and groove fits and a bearing cap with studs
and nuts. Goulds metallic labyrinth seals.
24 x 30-32
LDS
Double row roller bearings, both thrust and radial. Ring oil lube with constant level oiler, optional
grease lube. Bearing housing secured with tongue and groove fits and a bearing cap with studs
and nuts. Goulds metallic labyrinth seals.
30 x 30-31
30 x 30-38
XL
Double row roller bearings, both thrust and radial. Ring oil lube with constant level oiler, optional
grease lube. Bearing housing secured with tongue and groove fits and a bearing cap with studs
and nuts. Goulds metallic labyrinth seals.
30 x 36-42
20x30-42
XXL
Double row roller bearings, both thrust and radial. Ring oil lube with constant level oiler, optional
grease lube. Bearing housing secured with tongue and groove fits and a bearing cap with studs
and nuts. Goulds metallic labyrinth seals.
36x42-52