538572 1 Goulds ST31 Sump Effluent Pump Brochure

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TECHNICAL BROCHURE
BST31

ST31
SUBMERSIBLE SUMP/EFFLUENT PUMP

Goulds Water Technology
Wastewater
FEATURES
Corrosion-resistant construction
Cast iron body

AGENCY LISTINGS
Tested to UL 778 and CSA 22.2 108 Standards
¤

C

US

Thermoplastic impeller and cover

By Canadian Standards Association
File #LR38549

Replaceable power cord
Bearings: Upper sleeve and lower heavy duty ball
bearing construction.
Built-In Vent Hole: Prevents air-binding with no
added labor.
Motor is permanently lubricated for extended
service life and is powered for continuous
operation. All ratings are within the working limits
of the motor.

PERFORMANCE RATINGS
ST31
	
Total Head 	
	
(feet of water)
	4	
	10	
	15	
	20	

GPM	GPH
50	
40	
28	
15	

3,000
2,340
1,680
900

Complete unit is heavy duty, portable and compact.
Mechanical Seal: carbon/ceramic/Buna/	
stainless steel.
Stainless steel fasteners and stainless steel pipe
plug.

APPLICATIONS

MOTOR

Specially designed for the following uses:

• ST31: 1⁄3 HP, 115 V, 60 Hz, single phase, 3000 RPM,

• Basement draining
• Water transfer
• Dewatering
• Effluent Transfer
SPECIFICATIONS
Pump:

12.0 amps maximum.

• Built-in thermal overload protection with automatic
reset.

• Class B insulation
• Oil filled design
• High strength carbon steel shaft
• Power cord: Quick disconnect 10 foot standard

• Discharge size: 11⁄2" NPT

length, heavy duty 16/3 SJTW with NEMA 5-15 P

• Capacities: to 50 GPM.
• Maximum head: to 26 feet.
• Temperature: 104°F (40°C) maximum, continuous

three prong grounding plug, 115V.

when completely submerged.

• Solids handling: 1⁄2" maximum sphere.
• Automatic models include a float switch.
• Manual model available.
• Pumping range: see performance chart or curve
below.

PAGE 2

Goulds Water Technology
Wastewater
METERS FEET
30

MODEL: ST31
RPM: 3000
HP: 1/3

25

2 GPM

ST31
TOTAL DYNAMIC HEAD

1 FT

20

5
15

10

5

0

0

0

10

20

0

30

GPM 50

40

5

m3/h

10

CAPACITY

MODEL INFORMATION
Order
No.

Minimum
HP Volts Amps
Circuit
Phase
Breaker

ST31AV

Built-In Vertical

ST31A1
ST31M

Float Switch Style

Discharge
Cord
ConnecLength
tion

Built-In Wide Angle
⁄3

1

115

12.0

20

1

Plug / No Switch

ST31P1

Piggyback Wide
Angle

ST31PV

Piggyback Vertical

10'

1 ⁄2"
1

Minimum
On
Level

Minimum
Off
Level

Minimum
Basin
Diameter

8"

3.5"

11"

14"

7"

18"

Manual

Manual

11"

14"

7"

18"

8"

3.5"

11"

MaxiShipping
mum
Weight
Solids
lbs/kg
Size

⁄2

1

29 /
13.2

PAGE 3

DIMENSIONS

VERTICAL FLOAT SWITCH

(All dimensions are in inches. Do not use for construction purposes.)

6.4
6.4

9.6
9.6

2.2
2.2

Pump
On

12.1"

12.1
12.1
12.0
12.0
1 ⁄ " NPT DISCHARGE

11∨21
” NPT
2 DISCHARGE

Pump
Off

9"

4.5"

3.1
3.1

.6
.6

ADDITIONAL STRAINER AVAILABLE AS ACCESSORY
Part No. A2-STST

• Material of construction mineral filled TPO
• Snaps in place over pump suction
• Prevents pea gravel from entering pump

Xylem, Inc.
2881 East Bayard Street Ext., Suite A
Seneca Falls, NY 13148
Phone: (866) 325-4210
Fax: (888) 322-5877
www.xyleminc.com/brands/gouldswatertechnology
Goulds is a registered trademark of Goulds Pumps, Inc. and is used under license.
© 2012 Xylem Inc.

BST31 Rev. 1

April 2012
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