Greenlee 777 Mode D'emploi page 11

Laying Out a Segment Bend (cont'd)
Developed Length
Formula for Any Bend
developed length = 0.01744 x degree of bend x bending radius
0
0
0
10
15.70 17.27
20 31.40 32.97
30 47.10 48.67
40
62.80 64.37
50
87.50 80.07
60 94.20 95.77
70 109.90 111.47
80
125.60 127.17
90
141.30 142.87
To use this table: Determine the developed length by finding the intersection of the appropriate row ("tens" digit of
the radius) and appropriate column ("ones" digit of the radius).
Example:
Find the appropriate row:
Find the appropriate column:
Find the Developed Length
at that intersection:
To Locate the Center of a 90° Bend
Measure and mark the length of the stub. Subtract the
TO BOTTOM OF PIPE
radius of the bend and 1/2 of the O.D. of the pipe. Add
1/2 of the developed length.
Example:
Developed Length:
1/2 of Developed Length:
Center Mark:
48.92"
Greenlee Tools, Inc.
Developed Length Table
RADIUS - Increments by Ones
1 2 3
1.57 3.14 4.71
14.84 20.41
34.54 36.11
50.24 51.81
65.94 67.50
81.64 83.21
97.34 98.91
113.04 114.61
128.74 130.31
144.44 146.01
radius is 46 inches
row labeled "40"
column labeled "6"
72.22
60" stub 46" radius 90˚ bend
0.01744 x 90 x 46 = 72.2
72.2 x 1/2 = 36.1
60 - 46 - 1.18 + 36.1 = 48.92
CENTER BENDING MARK
4 5
6.28 7.85 9.42
21.98 23.85 25.12
37.68 39.25 40.82
53.38 54.95 56.52
69.03 70.65 72.22
84.78 86.35 87.92
100.48 102.05 103.62
116.18 117.75 119.32
131.88 133.45 135.02
147.58 149.15 150.72
11
4455 Boeing Dr., Rockford, IL 61109 815-397-7070
777 Segment Bender
6 7 8
10.99 12.56
26.69 28.26
42.39 43.96
58.09 59.66
73.79 75.36
89.49 91.06
105.19 106.76
120.89 122.46
136.59 138.16
9
14.13
29.83
45.53
61.23
76.93
92.63
108.33
124.03
139.73