U.S. GALLONS PER MINUTE
0 2 4 6 8 10 11 12
HE
AD
IN F
EE
T
0
50
100
150
200
250
300 T31 SERIES (60 Hz ODP Service Factor Motor Horsepower Selections*) 3450 RPM
A B C D E F G H
OPEN DRIP PROOF MOTORS ONLY
1 3 5 7 9
Section T-3
* Horsepower data is valid for 1.0 specific gravity fluids only
• Capacities to 10 GPM
• Heads to 300 Feet
• Low NPSH Requirements
• Horizontal Close Coupled
• Flex Coupled
MTH PUMPS
T31 Series
T31 SERIES
1/3
1/2
1/31/3
Composite Curves
T31
SERI
ES P
UMPS
© Copyright 2008 MTH Tool Company, Inc. Dated January 2008
T31 SERIES
T31 SERIES PUMPS
© Copyright 2008 MTH Tool Company, Inc. Dated January 2008
Page T-4
Composite Curves
* Horsepower data is valid for 1.0 specific gravity fluids only
U.S. GALLONS PER MINUTE
0 10
HE
AD
IN F
EE
T
0
50
100
150
200
250
300
9
T31 SERIES (50 Hz 1.0 Service Factor Motor Horsepower Selections*) 2880 RPM
A B C D E F G H
ALL MOTOR ENCLOSURES
87654321
U.S. GALLONS PER MINUTE
0 2 4 6 8 10 11 12
HE
AD
IN F
EE
T
0
50
100
150
200
250
300 T31 SERIES (60 Hz 1.0 Service Factor Motor Horsepower Selections*) 3450 RPM
A B C D E F G H
ALL MOTOR ENCLOSURES
1 3 5 7 9
1/3
1/3
1/3
1/2
1/2
1/2
3/4
1/3
1/3
1/31/2
1/3
1/2
1/3
1/3
1/3
1/3
1/2
1/2
1/2
1/3
T31 SERIES
T31
SERI
ES P
UMPS
© Copyright 2008 MTH Tool Company, Inc. Dated January 2008
Page T-5
Performance Curves
Indicates altered performance at NPSH Available* Horsepower data is valid for 1.0 specific gravity fluids only
U.S. GALLONS PER MINUTE0.0 0.5 1.0 1.5 2.0 2.5
HE
AD
IN F
EE
T
0
100
200
300
400
500
0
0.1
0.2
0.3
0%
10%
20%
30%
40%
T31A 3450 RPMHead-Capacity
BHP*
% Efficiency
NPSH 4’ 7’
BH
P*
EFF
0.4
U.S. GALLONS PER MINUTE0.0 0.5 1.0 1.5 2.0
HE
AD
IN F
EE
T
0
100
200
300
400
500
0
0.1
0.2
0.3
0%
10%
20%
30%
T31A 2880 RPM
Head-Capacity
BHP*
% Efficiency
NPSH 4’, 7’
BH
P*
EFF
0.4 40%
T31 SERIES
T31 SERIES PUMPS
© Copyright 2008 MTH Tool Company, Inc. Dated January 2008
Page T-6
Performance Curves
U.S. GALLONS PER MINUTE0.0 0.5 1.0 1.5 2.0 2.5 3.0
HE
AD
IN F
EE
T
0
100
200
300
400
500
0
0.25
0.5
0%
10%
20%
30%
40%
T31B 3450 RPMHead-Capacity
BHP*
% Efficiency
NPSH 4’ 7’
BH
P*
EFF
0.75
1.0
U.S. GALLONS PER MINUTE0.0 0.5 1.0 1.5 2.0 2.5
HE
AD
IN F
EE
T
0
100
200
300
400
500
0
0.25
0.5
0%
10%
20%
30%
T31B 2880 RPM
Head-Capacity
BHP*
% Efficiency
NPSH 4’
BH
P*
EFF
0.75
1.0 40%
Indicates altered performance at NPSH Available* Horsepower data is valid for 1.0 specific gravity fluids only
T31 SERIES
T31
SERI
ES P
UMPS
© Copyright 2008 MTH Tool Company, Inc. Dated January 2008
Page T-7
Head-Capacity
U.S. GALLONS PER MINUTE0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
HE
AD
INFE
ET
0
100
200
300
400
500
0
0.25
0.5
0.75
0%
10%
20%
30%
40%
T31C 3450 RPM
BHP*
% Efficiency
NPSH 4’ 7’
BH
P*
EFF
1.0
Performance Curves
U.S. GALLONS PER MINUTE0.0 0.5 1.0 1.5 2.0 2.5 3.0
HE
AD
IN F
EE
T
0
100
200
300
400
500
0
0.25
0.5
0.75
0%
10%
20%
30%
T31C 2880 RPM
Head-Capacity
BHP*
% Efficiency
NPSH 4’
BH
P*
EFF
Indicates altered performance at NPSH Available* Horsepower data is valid for 1.0 specific gravity fluids only
T31 SERIES
T31 SERIES PUMPS
© Copyright 2008 MTH Tool Company, Inc. Dated January 2008
Page T-8
Performance Curves
Head-Capacity
U.S. GALLONS PER MINUTE0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
HE
AD
INFE
ET
0
100
200
300
400
500
0
0.25
0.5
0.75
0%
10%
20%
30%
40%
T31D 3450 RPM
BHP*
% Efficiency
NPSH 4’ 7’ 10’
BH
P*
EFF
1.0
U.S. GALLONS PER MINUTE0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
HE
AD
IN F
EE
T
0
100
200
300
400
500
0
0.25
0.5
0%
10%
20%
30%
T31D 2880 RPM
Head-Capacity
BHP*
% Efficiency
NPSH 4’
BH
P*
EFF
0.75
40%1.0
Indicates altered performance at NPSH Available* Horsepower data is valid for 1.0 specific gravity fluids only
T31 SERIES
T31
SERI
ES P
UMPS
© Copyright 2008 MTH Tool Company, Inc. Dated January 2008
Page T-9
Performance Curves
U.S. GALLONS PER MINUTE0 1 2 3 4 5 6
HE
AD
IN F
EE
T
0
100
200
300
400
500
0
0.25
0.5
0.75
1.0
0%
10%
20%
30%
40%
T31E 3450 RPMHead-Capacity
% Efficiency
NPSH 4’ 7’ 10’
BH
P*
EFF
BHP*
U.S. GALLONS PER MINUTE0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
HE
AD
IN F
EE
T
0
100
200
300
400
500
0
0.25
0.5
0%
10%
20%
30%
40%
T31E 2880 RPM
Head-Capacity
BHP*
% Efficiency
NPSH 4’ 7’
BH
P*
EFF
0.75
1.0
Indicates altered performance at NPSH Available* Horsepower data is valid for 1.0 specific gravity fluids only
T31 SERIES
T31 SERIES PUMPS
© Copyright 2008 MTH Tool Company, Inc. Dated January 2008
Page T-10
Performance Curves
U.S. GALLONS PER MINUTE0 1 2 3 4 5 6
HE
AD
IN F
EE
T
0
100
200
300
400
500
0
0.5
1.0
0%
10%
20%
30%
40%
T31F 2880 RPM
Head-Capacity
BHP*
% Efficiency
NPSH 4’ 7’
BH
P*
EFF
1.5
2.0
U.S. GALLONS PER MINUTE0 2 6
HE
AD
IN F
EE
T
0
100
200
300
400
500
0
0.5
1.0
0%
10%
20%
30%
40%
T31F 3450 RPM
Head-Capacity
BHP*
% Efficiency
NPSH 4’ 7’ 10’
BH
P*
EFF
1 3 4 5 7
1.5
2.0
Indicates altered performance at NPSH Available* Horsepower data is valid for 1.0 specific gravity fluids only
T31 SERIES
T31
SERI
ES P
UMPS
© Copyright 2008 MTH Tool Company, Inc. Dated January 2008
Page T-11
Performance Curves
U.S. GALLONS PER MINUTE0 10
HE
AD
IN F
EE
T
0
100
200
300
400
500
0
0.5
1.0
1.5
0%
10%
20%
30%
40%
T31G 3450 RPM
Head-Capacity
BHP*
% Efficiency
NPSH 4’ 7’ 10’
BH
P*
EFF
1 2 3 4 5 6 7 8 9
2.0
U.S. GALLONS PER MINUTE0 2 6
HE
AD
IN F
EE
T
0
100
200
300
400
500
0
0.5
1.0
0%
10%
20%
30%
40%
T31G 2880 RPM
Head-Capacity
BHP*
% Efficiency
NPSH 4’ 7’
BH
P*
EFF
1 3 4 5 7 8
1.5
2.0
Indicates altered performance at NPSH Available* Horsepower data is valid for 1.0 specific gravity fluids only
T31 SERIES
T31 SERIES PUMPS
© Copyright 2008 MTH Tool Company, Inc. Dated January 2008
Page T-12
U.S. GALLONS PER MINUTE0 10
HE
AD
IN F
EE
T
0
100
200
300
400
500
0
0.5
1.0
0%
10%
20%
30%
T31H 2880 RPM
Head-Capacity
BHP*
% Efficiency
NPSH 4’ 7’
BH
P*
EFF
1 2 3 4 5 6 7 8 9
1.5
2.0 40%
Performance Curves
U.S. GALLONS PER MINUTE0 2 3 5 8 10 11 12
HE
AD
IN F
EE
T
0
100
200
300
400
500
0
0.5
1.0
1.5
0%
10%
20%
30%
40%
T31H 3450 RPM
Head-Capacity
BHP*
% Efficiency
NPSH 4’ 7’ 10’
BH
P*
EFF
1 4 6 7 9
2.0
Indicates altered performance at NPSH Available* Horsepower data is valid for 1.0 specific gravity fluids only
T31 SERIES
T31
SERI
ES P
UMPS
© Copyright 2008 MTH Tool Company, Inc. Dated January 2008
Page T-13
Dimensions
Horizontal Close Coupled
NOTESAll dimensions in inches. May vary ± ¼ inches.Not for construction purposes unless certified.*See motor dimension (Section Motors) for “C-AH” dimension (varies depending on motor enclosure).
C-AH*
2F
1 5/16
BA
1 3/16
3/4” NPT Inlet3/4” NPT Discharge
L
21/4
1 1/2D
HD
4-H
12
HS
7/8
E
T31 SERIES • THREE PHASE • HORIZONTAL CLOSE COUPLEDHP FRAME ENCL D E H BA 2F HS HD L
1/3 to 1 71 TEF 2 13/16 2 3/16 1/4-20 5 3/8 3 9/16 6 1/16 7 1/8 181 1/2 80 TEF 3 1/8 2 7/16 3/8-16 5 1/2 3 15/16 6 3/8 7 7/16 18
E
R
OT A T I O
N
IN
2513
Standard 360°Position
ROT
AT
IO
N
IN2513
Optional 90°Position
R OT
AT
IO
N
IN
2513
Optional 270°Position
R
OTATIO
N
IN
2513
Optional 180°Position
C-AH*
2F
1-5/16
BA
1-3/16
3/4” NPT Inlet3/4” NPT Discharge
L
21/4
1 1/2
D
HD
E
4-H TAPS
1
E
12
1
1
1
HS
7/8
T31 SERIES • SINGLE PHASE • HORIZONTAL CLOSE COUPLEDHP FRAME ENCL A D E H BA 2F HS HD L
1/3 ~ 1 48 ODP 6 1/4 3 2 1/8 5/16-18 6 5/16 2 3/4 6 1/4 7 5/16 181 1/2 56 ODP 6 1/4 3 1/2 2 1/8 5/16-18 6 3/8 2 3/4 6 3/4 7 13/16 18
Optional Steel Base (Not included in standard price)
E EA
Optional Steel Base (Not included in standard price)
T31 SERIES
T31 SERIES PUMPS
© Copyright 2008 MTH Tool Company, Inc. Dated January 2008
Page T-14
4-H Taps
E
E
1
1
2-3/8-16 Taps
2 7/16
2 7/16
12
1
1 4-17/32 Dia. Foundation Holes
P2 Bearing Frame
R
OT A T I O
N
IN
2513
Standard 360° Position
ROT
AT
IO
N
IN
2513
Optional 90° Position
R OT
AT
IO
N
IN
2513
Optional 270° Position
R
OTATIO
N
IN
2513
Optional 180° Position
T31 SERIES WITH P2 BEARING FRAMEFRAME D U BA+N+W 2F E H K HS HD L M
56 3 1/2 5/8 4 5/8 3 2 7/16 5/16-18 5/8 6 3/4 7 3/4 24 3/16
HD
3/4” NPT Discharge1/4
3/4” NPT Inlet
HS D
1 1/2
2 3/83/8K 3/4 Dia.
3/16 KeyU Dia.M Key
L
C-AH*
BA+N-W2F 3 6 1/2
1
7/8
NOTESAll dimensions in inches. May vary ± ¼ inches.Not for construction purposes unless certified.*See motor dimension (Section Motors) for “C-AH” dimension (varies depending on motor enclosure).
Optional Steel Base (Not included in standard price)