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TABLE 6—MAXIMUM ALLOWABLE PIPE LENGTH (FT) Continued
ALTITUDE UNIT SIZE
TERMINATION
TYPE
PIPE DIA
(IN.)*
NUMBER OF 90° ELBOWS
1234 5 6
4001 to 5000‡
024040
036040
2 Pipe or 2-In.
Concentric
1-1/2 60 55 50 45 44 39
2 70707070 70 70
024060
036060
048060
2 Pipe or 2-In.
Concentric
1-1/2 15 10 5 NA NA NA
2 64595853 52 52
036080
048080
060080
2 Pipe or 2-In.
Concentric
2 44392621 20 11
2-1/2 70 70 70 70 70 70
048100
060100
2 Pipe or 3-In.
Concentric
2-1/2 31 22 13 12 NA NA
3 70706762 57 52
→060120
2 Pipe or 3-In.
Concentric
3† no disk 53 46 40 33 26 20
4† no disk 70 70 70 70 70 70
→060140
2 Pipe or 3-In.
Concentric
3† no disk 21 17 13 9 5 NA
4† no disk 69 64 59 54 49 44
ALTITUDE UNIT SIZE
TERMINATION
TYPE
PIPE DIA
(IN.)*
NUMBER OF 90° ELBOWS
123456
5001 to 6000‡
024040
036040
2 Pipe or 2-In.
Concentric
1-1/2 57 52 47 42 40 35
2 707070707070
024060
036060
048060
2 Pipe or 2-In.
Concentric
1-1/2 14 9 NA NA NA NA
2 605554494847
036080
048080
060080
2 Pipe or 2-In.
Concentric
2 4136231817 8
2-1/2 70 70 70 70 70 70
048100
060100
2 Pipe or 3-In.
Concentric
2-1/2 29 21 12 11 NA NA
3 706762575247
→060120
2 Pipe or 3-In.
Concentric
3† no disk 42 35 29 22 15 9
4† no disk 70 70 70 70 70 70
→060140
2 Pipe or 3-In.
Concentric
3† no disk 12 8 NA NA NA NA
4† no disk 42 37 32 27 22 17
ALTITUDE UNIT SIZE
TERMINATION
TYPE
PIPE DIA
(IN.)*
NUMBER OF 90° ELBOWS
123456
6001 to 7000‡
024040
036040
2 Pipe or 2-In.
Concentric
1-1/2 53 48 43 38 37 32
2 707068676664
024060
036060
048060
2 Pipe or 2-In.
Concentric
1-1/2 13 8 NA NA NA NA
2 575250454443
036080
048080
060080
2 Pipe or 2-In.
Concentric
2 3833211615 6
2-1/2 70 70 68 67 66 64
048100
060100
2 Pipe or 3-In.
Concentric
2-1/2 27 19 10 9 NA NA
3 686358534843
→060120
2 Pipe or 3-In.
Concentric
3† no disk 31 24 18 11 NA NA
4† no disk 70 70 70 70 67 62
→060140
2 Pipe or 3-In.
Concentric
4† no disk 17 12 7 NA NA NA
ALTITUDE UNIT SIZE
TERMINATION
TYPE
PIPE DIA
(IN.)*
NUMBER OF 90° ELBOWS
123456
7001 to 8000‡
024040
036040
2 Pipe or 2-In.
Concentric
1-1/2 49 44 39 34 33 28
2 666563626059
024060
036060
048060
2 Pipe or 2-In.
Concentric
1-1/2 12 7 NA NA NA NA
2 534846414038
036080
048080
060080
2 Pipe or 2-In.
Concentric
2 3631191412NA
2-1/2 66 65 63 62 60 59
048100
060100
2 Pipe or 3 In.
Concentric
2-1/2 25 17 8 7 NA NA
3 635853484338
→060120
2 Pipe or 3-In.
Concentric
3† no disk 20 13 7 NA NA NA
4† no disk 61 56 51 46 41 36
→060140 NA
See notes on page 26.
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