An ITT Brand

Goulds 3420
Large Capacity, Single Stage,
Double Suction Pump
3420
Double Suction Pumps Designed for a Wide Range of
Heavy Duty Industrial, Municipal and Power Generation
Services
• Capacities to 74,000 GPM (16,807 m3/h)
• Heads to 500 feet (152 m)
• Temperatures to 350°F (176°C)
• Working Pressures to 330 PSIG (2275 kPa)

Design Features
• Horizontally Split Casing - In-line suction and
discharge nozzles in lower half casing for ease of
inspection/maintenance.

• Double Suction Impeller - Assures Hydraulic Axial

Balance for lower thrust bearing loads, longer pump
life, and low maintenance. Services
• Wear Rings - Easily replaceable wear rings renew • Process - Quench water, stripper bottoms, reboiler
running clearances, protect against impeller, casing circulation, cooling tower
wear. Overall cost of operation is minimized.
• Pulp & Paper - Primary and secondary cleaner,
• Sealing Flexibility - Choice of packing or wide filtrate, mill water supply shower, fan pump, headbox
range of mechanical seals. supply, shower

• Installation Versatility - Horizontal or vertical • Primary Metals- Cooling Water, Quenceh and
mounting, clockwise or counter clockwise rotation. Leaching

• Material Flexibility - Available in a wide variety of • Municipal - High Lift, Low Lift, Wash Water, Waste
metals from cast iron to stainless steels. Water, Raw Water

• Power Generation - Cooling Tower, Component

Cooling, Service Water, Ash Sluicing, Heater Drain

• Marine - Bilge and Ballast, Cargo, Cooling Water,

Fire Pump

• General - River Water, Brine, Sea Water

2 3420
 Sectional View
101 100

134
126

106
410

122

168

124
107
105

127
142

Parts List and Materials of Construction

Part Number Part Description Bronze Fitted 316SS Fitted All 316SS
100 Casing Cast Iron 316SS
101 Impeller Bronze 316SS
105 Lantern Ring Teflon
106 Packing Graphite Impregnated Yarn
107 Packing Gland 316SS
250 Mechanical Seal Gland 316SS
122 Shaft Carbon Steel
124 Shaft Sleeve Nut Bronze Nitronic 60
126 Shaft Sleeve¹ 316SS
127 Casing Wear Ring Bronze Nitronic 60
134 Bearing Housings Cast Iron
142 Impeller Wear Ring Bronze 316SS
168 & 410 Bearings Steel (Anti-Friction)
1 Also available in hardened/hard metal coated materials

3420 3
3420 Large Capacity, Single Stage,
Double Suction Pumps
Heavy Duty Design Features for a Wide Range of
Water Supply and Process Services

RENEWABLE CASE WEAR RINGS

Permits easy maintenance of proper
running clearances. Locked in lower
half casing to prevent rotation.

HIGH THRUST CAPABILITY

Bearings designed to handle
unexpected thrust. Secured with
locknut and washer.

LARGE INLET AREAS

Assures smooth flow to
impeller inlet for efficient,
quiet operation.

DOUBLE SUCTION IMPELLER

Minimizes axial thrust.
Highly efficient for smooth,
vibration-free operation.

4 3420
HEAVY DUTY CASING
Casing walls designed to withstand pressure extremes. Rugged design resists
external forces and vibrations. Both suction and discharge connections in lower half
casing. Removal of upper half casing permits inspection, maintenance and removal
of the complete rotating element without disturbing piping or driver.

RENEWABLE IMPELLER WEAR RINGS

A must for proper maintenance of running
clearances. Rings are mechanically locked onto
impeller hubs.

POSITIVE LIQUID SEALING

O-rings between impeller and
sleeves, and O-rings between
sleeves and sleeve nuts protect
shaft from pumpage or confined
corrosion attack.

LABYRINTH BEARING PROTECTION

Labyrinth bearing isolators
significantly reduce the chance for
bearing contamination and greatly
improve mean time between failures.

HEAVY DUTY SHAFT

Designed to reduce deflection.
Renewable shaft sleeves fully
protect shaft from pumpage.
Threaded sections removed
from stress areas.

DUAL VOLUTE CASING DESIGN

Dual volutes having cutwaters 180º
apart provide opposing radial forces
reducing radial loads on bearings and
minimizing shaft deflection. Permits
smooth, trouble-free operation over
wide range of flow rates.

3420 5
Dimensions and Weights
C T MINIMUM HEAD ROOM REQUIRED
TO REMOVE UPPER HALF CASING
YY X

OH

S Z

D
125#FF
ANSI
SUCTION
FLANGE
125#FF
HA ANSI
DISCHARGE
HB FLANGE

Weight Lbs.
Pump Size C T D O OH S&Z X YY HA HB
(kg)
12X14-15 33.0 (838) 26.8 (679) 26.4 (670) 42.3 (1073) 25.0 (635) 14.8 (375) 17.8 (451) 24.8 (629) 33.0 (838) 24.0 (610) 2600 (1179)
16X18-17/H 33.0 (838) 26.8 (679) 33.5 (851) 54.3 (1378) 31.0 (787) 18.8 (476) 20.9 (530) 31.5 (800) 33.0 (838) 24.0 (610) 3500 (1588)
16X18-30/G/H 44.4 (1127) 36.6 (930) 36.0 (914) 62.3 (1581) 41.3 (1048) 22.5 (572) 28.0 (711) 34.0 (864) 46.0 (1168) 47.0 (1194) 7060 (3202)
18X20-24/G 39.1 (992) 30.8 (783) 35.5 (902) 59.9 (1521) 38.0 (965) 19.5 (495) 20.6 (524) 38.9 (989) 49.0 (1245) 46.0 (1168) 5650 (2563)
18X20-30 44.4 (1127) 36.6 (930) 37.5 (953) 64.3 (1632) 41.8 (1060) 22.8 (578) 29.0 (737) 35.0 (889) 48.0 (1219) 47.0 (1194) 7500 (3402)
20X24-24 44.4 (1127) 36.6 (930) 38.0 (965) 63.8 (1619) 37.8 (959) 20.5 (521) 26.6 (675) 34.0 (864) 42.0 (1067) 47.0 (1194) 7200 (3266)
20X24-28/G/H 37.9 (962) 37.9 (962) 42.1 (1070) 70.3 (1784) 44.0 (1118) 23.1 (587) 24.5 (622) 46.2 (1173) 56.0 (1422) 54.0 (1372) 8650 (3924)
20X24-30 46.0 (1168) 36.6 (930) 40.5 (1029) 68.0 (1727) 42.5 (1080) 23.5 (597) 29.5 (749) 36.0 (914) 50.0 (1270) 47.0 (1194) 8000 (3629)
24X30-32/G/H/N 44.4 (1127) 39.8 (1010) 44.0 (1118) 74.1 (1883) 45.0 (1143) 22.5 (572) 36.0 (914) 50.0 (1270) 56.0 (1422) 51.0 (1295) 11,500 (5216)
30X30-31/G 50.0 (1270) 42.9 (1089) 53.3 (1353) 86.4 (2196) 50.7 (1287) 33.4 (848) 40.0 (1016) 52.0 (1321) 63.4 (1610) 53.4 (1356) 16,200 (7348)
30X30-38/G 53.0 (1346) 42.9 (1089) 53.3 (1353) 87.5 (2223) 53.3 (1353) 30.8 (781) 36.5 (927) 54.5 (1384) 63.4 (1610) 53.4 (1356) 15,400 (6985)
25,250
30X36-42/G/H 60.8 (1545) 47.6 (1210) 58.0 (1473) 97.5 (2477) 62.0 (1575) 34.0 (864) 36.0 (914) 54.5 (1384) 78.0 (1981) 76.0 (1930)
(11,453)

All dimensions in inches (mm) and are not to be used for construction or installation purposes.
Standard rotation is right hand (CW). Optional rotation is left hand (CCW).
Steel casings will have 150#RF flanges.

6 3420
 Hydraulic Coverage

700

16x18-30G
16x18-30H 20x24-30

400
20x30-42

24x30-32N 24x30-32
16x18-30
18x20-30 24x30-32H
30x36-42
60Hz TDH [feet]

30x36-42G
24x30-32G
18x20-24G
36x42-52
20x24-28G
30x36-42H

20x24-24

30x30-38G
20x24-28H 30x30-31G

20x24-28
40
5000 50000 100000
60Hz Flow [gpm]

3420 7
Locations

Manufacturing Center

PRO Services Center

For more information Please Visit:

www.gouldspumps.com | www.ittproservices.com

An ITT Brand
240 Fall Street
Seneca Falls, NY 13148
Phone: 315.568.2811
Fax: 315.568.2418
www.gouldspumps.com © 2024 ITT Goulds Pumps Inc. B.3420.en-US.2024-08