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Table H. Radii of coiled expansion loops & developed lengths of expansion offsets

Expected
expansion,
inches
Radius R, inches, for nominal or standard tube sizes shown
Radius L, inches, for nominal or standard tube sizes shown
1/4
3/8
1/2
3/4
1
1 1/4
1 1/2
2
2 1/2
3
3 1/2
4
5
1/2
R
6
7
8
9
11
12
13
15
16
18
19
20
23
L
38
44
50
59
67
74
80
91
102
111
120
128
142
1
R
9
10
11
13
15
17
18
21
23
25
27
29
32
L
54
63
70
83
94
104
113
129
144
157
169
180
201
1 1/2
R
11
12
14
16
18
20
22
25
28
30
33
35
39
L
66
77
86
101
115
127
138
158
176
191
206
220
245
2
R
12
14
16
19
21
23
25
29
32
35
38
41
45
L
77
89
99
117
133
147
160
183
203
222
239
255
284
2 1/2
R
14
16
18
21
24
26
29
33
36
40
43
45
51
L
86
99
111
131
149
165
179
205
227
248
267
285
318
3
R
15
17
19
23
26
29
31
36
40
43
47
50
55
L
94
109
122
143
163
180
196
224
249
272
293
312
348
3 1/2
R
16
19
21
25
28
31
34
39
43
47
50
54
60
L
102
117
131
155
176
195
212
242
269
293
316
337
376
4
R
17
20
22
26
30
33
36
41
46
50
54
57
64
L
109
126
140
166
188
208
226
259
288
314
338
361
402

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