Established 1875

Section Modulus
of Pipe
(Machinery Handbook)
Size
Standard
Extra
Heavy
Double
Extra
Heavy
1" .133 .161 .214
1 1/4" .235 .291 .411
1 1/2" .326 .412 .598
2" .561 .731 1.104
2 1/2" 1.064 1.339 1.997
3" 1.724 2.225 3.424
3 1/2" 2.394 3.140 4.924
4" 3.214 4.271 6.793
4 1/2" 4.177 5.621 9.047
5" 5.451 7.431 12.090
6" 8.496 12.220 20.020

Tensile Strengths for Common Materials (PSI)
Pure Aluminum (not alloy) 5,000
Aluminum 6063-T5 21,000
Soft Copper 5,000
Copper busbar 10,000
Mild Steel 30,000
Stainless Steel 43,000
Cold rolled Steel 60,000
Alloy 4140 as rolled 90,000

Tube, Pipe, and Metal Bending Machine Selection
The rotary compression bending process is suitable for bending pipe and tubing to a centerline radius that is equal to three times (3D) the nominal pipe size or actual tube diameter. On schedule 80 and extra heavy pipe satisfactory bends can be made on a 2D radius. These bends are suitable for replacing welded elbows in process piping applications. Our benders are used a great deal by the power plant industry (hydroelectric, fossil fired, and nuclear). They are also used extensively in pipe shops for plant maintenance and by manufacturers of products that require process piping and hydraulic lines. Bends that are made on a 5D radius are used primarily in nuclear plants and by shipbuilding companies, although they are being used more frequently by industry. PEDRICK benders are best suited for applications that require a compact, low priced machine that requires minimal maintenance.

Bending is a form of structural engineering and follows the same laws. In the case of structural engineering, all operation is below the elastic limit. In the case of bending, all operation is above the elastic limit. The standard bending formula is:

M = FS   M = Bending Moment (inch-pounds)
F = Yield Strength (PSI)
S = Section Modulus (IN3)

Pedrick benders are rated in Bending Moments measured in inch-pounds.
Section Modulus for Tubes
Tube
Size		 .134"
10		 .109"
12		 .083"
14		 .065"
16		 .049"
18		 .035"
20
1/4" ... ... ... .0016 .0014 .0010
5/16" ... ... .0029 .0024 .0022 .0018
3/8" .0063 .0052 .0018 .0042 .0037 .0027
7/16" .0081 .0078 .0070 .0065 .0056 .0038
1/2" .012 .011 .010 .0086 .0074 .0052
5/8" .022 .020 .017 .014 .012 .0087
3/4" .034 .031 .026 .022 .018 .012
7/8" .051 .046 .038 .031 .026 .017
1" .071 .062 .049 .041 .035 .023
1 1/4" .120 .104 .084 .068 .059 .040
1 1/2" .183 .158 .129 .103 .086 .052
1 3/4" .317 .229 .180 .138 .111 .067
2" .353 .297 .239 .187 .156 .095
2 1/4" .441 .370 .293 .228 ... ...
2 1/2" .574 .481 .363 .299 ... ...
2 3/4" .703 .588 .465 .389 ... ...
3" .850 .708 .566 .494 ... ...
To Select a Pedrick Bending machine
to bend 2 IN OD x 10 GA (.134 wt):

M = FS
S = .353 IN3 (from table)
F = 36,000 lbs/IN2

M
= (.353 IN3) x 36,000 lbs/IN2
= 12,708 IN-lbs

Pedrick's Model A-5 with a bending capacity of 20,000 IN-lbs of bending moment is the proper selection.

    
  Pedrick offers a comprehensive line of tube, pipe, and metal benders, some models were developed specifically for certain specialized applications.
     From our Model A-1, a compact benchtop unit, to our D and E Series high powered, high production models, we have a base unit that will address your unique applications.
     Contact us for fast, personal assistance in selecting the best model for your shop, and full information on outfitting your unit with specialized tooling.

Model
Number		 HP Bending
Moment		 Pipe
Capacity		 Tube
Capacity(crew)		 Round
Barstock		 Approx.
Weight		 Spindle
Diameter		 Floor
Space
A-1
1
2,800 IN-lbs
3/4 IN SCH 40
1 IN OD x .125 WT
 3/4 IN OD 650 LBS 2 IN 2 ft x 2 ft
.75 kW
349 N-m
26.6 MM
25 MM x 1.6 MM
 19 MM 295 KG 50.8 MM .75 M x .75 M
A-3
3
9,000 IN-lbs
1 1/4 IN SCH 40
1 5/8 IN OD x .125 WT
 1 1/4 IN OD 1600 lbs 3 IN 3 ft x 3 ft
2.2 kW
1019 N-m
42.1 MM
42 MM x 3.1 MM
 31 MM 726 kg 76.2 MM .9 M x .9 M
A-5
5
20,000 IN-lbs
2 IN SCH 40
2 3/8 IN OD x .187 WT
 1 1/2 IN OD 1750 lbs 3 IN 3 ft x 3 ft
3.7 kW
1900 N-m
60.3 MM
60 MM x 4.7 MM
 38 MM 795 kg 76.2 MM .9 M x .9 M
A-7
5
28,500 IN-lbs
2 IN SCH 80
2 3/8 IN OD x .218 WT
 1 3/4 IN OD 2000 lbs 3 IN 3.5 ft x 3.5 ft
3.7 kW
3192 N-m
60.3 MM
60 MM x 5.5 MM
 44 MM 909 kg 76.3 MM 1 M x 1 M
B-10
10
75,000 IN-lbs
2 1/2 IN SCH 80
2.7/8 IN OD x .187 WT
 2 1/2 IN OD 6500 lbs 4 1/2 IN 4 ft x 4 ft
7.5 kW
8500 N-m
73 MM
73 MM x 5.2 MM
 64 MM 2955 kg 114 MM 1.2 M x 1.2 M
D-10
10
100,000 IN-lbs
3 IN SCH 80
3 1/2 IN OD x .312 WT
 3 IN OD 7000 lbs 4 1/2 IN 4 ft x 5 ft
7.5 kW
11300 N-m
88.9 MM
89 MM x 7.9 MM
 76 MM 3175 kg 114 MM 1.2 M x 1.5 M
D-15
15
150,000 IN-lbs
4 IN SCH 80
4 1/2 IN OD x .375 WT
 - 7500 lbs 4 1/2 IN 5 ft x 5 ft
11.25 kW
17000 N-m
101.6 MM
101 MM x 9.5 MM
 - 3401 kg 114 MM 1.5 M x 1.5 M
D-20
20
180,000 IN-lbs
5 IN SCH 40
5 1/2 IN OD x .250 WT
 - 8000 lbs 4 1/2 IN 5 ft x 5 ft
14.9 kW
20337 N-m
127 MM
127 MM x 6.5 MM
 - 3600 kg 114 MM 1.5 M x 1.5 M
E-20
20
255,000 IN-lbs
6 IN SCH 40
6 5/8 IN OD x .280 WT
 - 16,800 lbs 7 IN 7 ft x 7 ft
14.9 kW
28815 N-m
152 MM
152 MM x 7.1 MM
 - 7560 kg 178 MM 2.1 M x 2.1 M

Pedrick Tool and Machine Company, Inc.
P.O. Box 190    1518 Bannard Street    Riverton, New Jersey 08077-1805
Phone (856) 829-8900     Fax (856) 829-8902
info@pedrick.com

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