TABLE 7—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 3530 15NANANA
3†70 70 70 70 70 70
Altitude Unit
Size Termination
Type Pipe Diameter
(In.)* Number of 90°Elbows
123456
2001 to 3000
042040 2 Pipe or 2-In.
Concentric 1-1/2 45 40 35 30 25 20
2 707070707070
042060 2 Pipe or 2-In.
Concentric 1-1/2 45 40 35 30 25 20
2 707070707070
042080
060080 2 Pipe or 2-In.
Concentric 1-1/2 26 21 16 11 6 NA
2 707070707070
060100 2 Pipe or 2-In.
Concentric 2 403530252015
2-1/2 70 70 70 70 70 70
060120 2 Pipe or 3-In.
Concentric 3 3126 12NANANA
3†63 62 62 61 61 61
Altitude Unit
Size Termination
Type Pipe Diameter
(In.)* Number of 90°Elbows
123456
3001 to 4000
042040 2 Pipe or 2-In.
Concentric 1-1/2 42 37 32 27 22 17
2 707070707070
042060 2 Pipe or 2-In.
Concentric 1-1/2 42 37 32 27 22 17
2 707070707070
042080
060080 2 Pipe or 2-In.
Concentric 1-1/2 25 20 15 10 5 NA
2 707070707070
060100 2 Pipe or 2-In.
Concentric 2 383328231813
2-1/2 70 70 70 70 70 70
060120 2 Pipe or 3-In.
Concentric 3 2924 10NANANA
3†59 59 58 57 57 56
Altitude Unit
Size Termination
Type Pipe Diameter
(In.)* Number of 90°Elbows
123456
4001 to 5000‡
042040 2 Pipe or 2-In.
Concentric 1-1/2 40 35 30 25 20 15
2 707070707070
042060 2 Pipe or 2-In.
Concentric 1-1/2 40 35 30 25 20 15
2 707070707070
042080
060080 2 Pipe or 2-In.
Concentric 1-1/2 23 18 13 8 NA NA
2 707070707068
060100 2 Pipe or 2-In.
Concentric 2 363126211611
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
123456
5001 to 6000‡
042040 2 Pipe or 2-In.
Concentric 1-1/2 37 32 27 22 17 12
2 707070707070
042060 2 Pipe or 2-In.
Concentric 1-1/2 37 32 27 22 17 12
2 707070707070
042080
060080 2 Pipe or 2-In.
Concentric 1-1/2 22 17 12 7 NA NA
2 707070706863
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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