Greenlee 884 Mode D'emploi page 11

Bending Instructions (cont'd)
Laying Out a Segment Bend (cont'd)
Developed Length Formula
Use the following formula to calculate the developed length for any bend:
developed length = 0.01744 x degree of bend x bending radius
Developed Length for 90° Bend Table
Radius—
Increments by Tens
0
10
20
30
40
50
60
70
80
90
To use the table above, find the intersection of the
appropriate row ("tens" digit of the radius) and appropri-
ate column ("ones" digit of the radius) to determine the
developed length.
Example:
Find the appropriate row:
Find the appropriate column:
Find the developed length
at that intersection:
To Locate the Center of a 90° Bend
TO BOTTOM OF PIPE
Measure and mark the length of the stub. Subtract the
radius of the bend and 1/2 of the O.D. of the pipe. Add
1/2 of the developed length.
Example: 60" stub 46" radius 90° bend
Developed length: 0.01744 x 90 x 46 = 72.2
1/2 of developed
length: 72.2 x 1/2 = 36.1
Center mark: 60 – 46 – 1.18 + 36.1 = 48.92
48.92"
Greenlee / A Textron Company
0 1 2
0 1.57 3.14
15.70 17.27 14.84
31.40 32.97 34.54
47.10 48.67 50.24
62.80 64.37 65.94
87.50 80.07 81.64
94.20 95.77 97.34
109.90 111.47 113.04
125.60 127.17 128.74
141.30 142.87 144.44
46" radius
40
6
72.22
CENTER BENDING MARK
884 and 885 Hydraulic Benders
Radius—Increments by Ones
3 4 5
4.71 6.28 7.85
20.41 21.98 23.85
36.11 37.68 39.25
51.81 53.38 54.95
67.50 69.03 70.65
83.21 84.78 86.35
98.91 100.48 102.05
114.61 116.18 117.75
130.31 131.88 133.45
146.01 147.58 149.15
Suggested Number of Bends Table
Radius
4" to 10"
10" to 20"
20" to 30"
30" to 40"
40" to 50"
50" to 60"
* The minimum and maximum number of bends are suggestions
only. Using a larger number of bends will produce a smoother
segment bend.
11
4455 Boeing Dr. • Rockford, IL 61109-2988 USA • 815-397-7070
6 7 8
9.42 10.99 12.56
25.12 26.69 28.26
40.82 42.39 43.96
56.52 58.09 59.66
72.22 73.79 75.36
87.92 89.49 91.06
103.62 105.19 106.76
119.32 120.89 122.46
135.02 136.59 138.16
150.72
Suggested Number of Bends*
Minimum Maximum
2
3
5
9
13
19
9
14.13
29.83
45.53
61.23
76.93
92.63
108.33
124.03
139.73
3
5
9
13
19
25