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TABLE 6—MAXIMUM ALLOWABLE PIPE LENGTH (FT)
ALTITUDE
UNIT
SIZE
TERMINATION
TYPE
PIPE DIAMETER
(IN.)*
NUMBER OF 90° ELBOWS
123456
0 to 2000
042040
2 Pipe or 2-In.
Concentric
1-1/2 50 45 40 35 30 25
2 707070707070
042060
2 Pipe or 2-In.
Concentric
1-1/2 50 45 40 35 30 25
2 707070707070
042080
060080
2 Pipe or 2-In.
Concentric
1-1/2 30 25 20 15 10 5
2 707070707070
060100
2 Pipe or 2-In.
Concentric
2 454035302520
2-1/2 70 70 70 70 70 70
060120
2 Pipe or 3-In.
Concentric
2-1/2 10 NA NA NA NA NA
3 353015NANANA
3† 70 70 70 70 70 70
ALTITUDE
UNIT
SIZE
TERMINATION
TYPE
PIPE DIAMETER
(IN.)*
NUMBER OF 90° ELBOWS
1234 5 6
2001 to 3000
042040
2 Pipe or 2-In.
Concentric
1-1/2 45 40 35 30 25 20
2 70707070 70 70
042060
2 Pipe or 2-In.
Concentric
1-1/2 45 40 35 30 25 20
2 70707070 70 70
042080
060080
2 Pipe or 2-In.
Concentric
1-1/2 26 21 16 11 6 NA
2 70707070 70 70
060100
2 Pipe or 2-In.
Concentric
2 40353025 20 15
2-1/2 70 70 70 70 70 70
060120
2 Pipe or 3-In.
Concentric
3 312612NANANA
3† 63 62 62 61 61 61
ALTITUDE
UNIT
SIZE
TERMINATION
TYPE
PIPE DIAMETER
(IN.)*
NUMBER OF 90° ELBOWS
1234 5 6
3001 to 4000
042040
2 Pipe or 2-In.
Concentric
1-1/2 42 37 32 27 22 17
2 70707070 70 70
042060
2 Pipe or 2-In.
Concentric
1-1/2 42 37 32 27 22 17
2 70707070 70 70
042080
060080
2 Pipe or 2-In.
Concentric
1-1/2 25 20 15 10 5 NA
2 70707070 70 70
060100
2 Pipe or 2-In.
Concentric
2 38332823 18 13
2-1/2 70 70 70 70 70 70
060120
2 Pipe or 3-In.
Concentric
3 292410NANANA
3† 59 59 58 57 57 56
ALTITUDE
UNIT
SIZE
TERMINATION
TYPE
PIPE DIAMETER
(IN.)*
NUMBER OF 90° ELBOWS
12345 6
4001 to 5000‡
042040
2 Pipe or 2-In.
Concentric
1-1/2 40 35 30 25 20 15
2 7070707070 70
042060
2 Pipe or 2-In.
Concentric
1-1/2 40 35 30 25 20 15
2 7070707070 70
042080
060080
2 Pipe or 2-In.
Concentric
1-1/2 23 18 13 8 NA NA
2 7070707070 68
060100
2 Pipe or 2-In.
Concentric
2 3631262116 11
2-1/2 70 70 70 70 70 70
060120
2 Pipe or 3-In.
Concentric
3† 56 55 54 53 52 52
ALTITUDE
UNIT
SIZE
TERMINATION
TYPE
PIPE DIAMETER
(IN.)*
NUMBER OF 90° ELBOWS
12345 6
5001 to 6000‡
042040
2 Pipe or 2-In.
Concentric
1-1/2 37 32 27 22 17 12
2 7070707070 70
042060
2 Pipe or 2-In.
Concentric
1-1/2 37 32 27 22 17 12
2 7070707070 70
042080
060080
2 Pipe or 2-In.
Concentric
1-1/2 22 17 12 7 NA NA
2 7070707068 63
060100
2 Pipe or 2-In.
Concentric
2 3328231813 8
2-1/2 70 70 70 70 70 70
060120
2 Pipe or 3-In.
Concentric
3† 53 52 50 49 48 47
See notes on next page.
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