TABLE 9—MAXIMUM ALLOWABLE PIPE LENGTH (FT)
ALTITUDE (FT)
UNIT SIZE
TERMINATION
TYPE
PIPE DIA
(IN.)*
NUMBER OF 90° ELBOWS
1
2
3
4
5
6
0 to 2000
024040
036040
2 Pipe or 2-in
Concentric
1
5
NA
NA
NA
NA
NA
1-1/2
70
70
65
60
60
55
2
70
70
70
70
70
70
024060
036060
048060
2 Pipe or 2-in
Concentric
1-1/2
20
15
10
5
NA
NA
2
70
70
70
70
70
70
036080
048080
060080
2 Pipe or 2-in
Concentric
1-1/2
10
NA
NA
NA
NA
NA
2
55
50
35
30
30
20
2-1/2
70
70
70
70
70
70
048100
060100
2 Pipe or 3-in
Concentric
2
5
NA
NA
NA
NA
NA
2-1/2
40
30
20
20
10
NA
3
70
70
70
70
70
70
060120
2 Pipe or 3-in.
Concentric
2-1/2 one disk
10
NA
NA
NA
NA
NA
3†
45
40
35
30
25
20
3† no disk
70
70
70
70
70
70
060140
2 Pipe or 3-in.
Concentric
2-1/2 one disk
5
NA
NA
NA
NA
NA
3† one disk
40
35
30
25
20
15
3† no disk
60
56
52
48
44
40
4† no disk
70
70
70
70
70
70
ALTITUDE (FT)
UNIT SIZE
TERMINATION
TYPE
PIPE DIA
(IN.)*
NUMBER OF 90° ELBOWS
1
2
3
4
5
6
2001 to 3000
024040
036040
2 Pipe or 2-in
Concentric
1-1/2
67
62
57
52
52
47
2
70
70
70
70
70
70
2 Pipe or 2-in
Concentric
1–1/2
17
12
7
NA
NA
NA
024060
036060
048060
2
70
67
66
61
61
61
036080
048080
060080
2 Pipe or 2-in
Concentric
2
49
44
30
25
25
15
2-1/2
70
70
70
70
70
70
048100
060100
2 Pipe or 3-in
Concentric
2–1/2
35
26
16
16
6
NA
3
70
70
70
70
66
61
060120
2 Pipe or 3-in.
Concentric
3
14
9
NA
NA
NA
NA
3† no disk
70
70
63
56
50
43
4† no disk
70
70
70
70
70
70
060140
2 Pipe or 3-in.
Concentric
3† one disk
20
15
10
5
NA
NA
3† no disk
39
35
31
27
23
19
4† no disk
70
70
70
70
70
70
ALTITUDE (FT)
UNIT SIZE
TERMINATION
TYPE
PIPE DIA
(IN.)*
NUMBER OF 90° ELBOWS
1
2
3
4
5
6
3001 to 4000
024040
036040
2 Pipe or 2-in
Concentric
1-1/2
64
59
54
49
48
43
2
70
70
70
70
70
70
024060
036060
048060
2 Pipe or 2-in
Concentric
1–1/2
16
11
6
NA
NA
NA
2
68
63
62
57
57
56
036080
048080
060080
2 Pipe or 2-in
Concentric
2
46
41
28
23
22
13
2-1/2
70
70
70
70
70
70
048100
060100
2 Pipe or 3-in
Concentric
2-1/2
33
24
15
14
5
NA
3
70
70
70
66
61
56
060120
2 Pipe or 3-in.
Concentric
3† no disk
65
58
51
44
38
31
4† no disk
70
70
70
70
70
70
060140
2 Pipe or 3-in.
Concentric
3† one disk
11
6
NA
NA
NA
NA
3† no disk
30
26
22
18
14
10
4† no disk
70
70
70
70
70
70
See notes at end of table
—38—
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