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TABLE 6—MAXIMUM ALLOWABLE PIPE LENGTH (FT)
ALTITUDE UNIT SIZE
TERMINATION
TYPE
PIPE DIA
(IN.)*
NUMBER OF 90° ELBOWS
123456
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 707070707070
024060
036060
048060
2 Pipe or 2-In.
Concentric
1-1/2 20 15 10 5 NA NA
2 707070707070
036080
048080
060080
2 Pipe or 2-In.
Concentric
1-1/2 10 NA NA NA NA NA
2 555035303020
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 707070707070
→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
4† 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 UNIT SIZE
TERMINATION
TYPE
PIPE DIA
(IN.)*
NUMBER OF 90° ELBOWS
123456
2001 to 3000
024040
036040
2 Pipe or 2-In.
Concentric
1-1/2 67 62 57 52 52 47
2 707070707070
024060
036060
048060
2 Pipe or 2-In.
Concentric
1-1/2 17 12 7 NA NA NA
2 706766616161
036080
048080
060080
2 Pipe or 2-In.
Concentric
2 494430252515
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 707070706661
→060120
2 Pipe or 3-In.
Concentric
3 14 9 NANANANA
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 UNIT SIZE
TERMINATION
TYPE
PIPE DIA
(IN.)*
NUMBER OF 90° ELBOWS
123456
3001 to 4000
024040
036040
2 Pipe or 2-In.
Concentric
1-1/2 64 59 54 49 48 43
2 707070707070
024060
036060
048060
2 Pipe or 2-In.
Concentric
1-1/2 16 11 6 NA NA NA
2 686362575756
036080
048080
060080
2 Pipe or 2-In.
Concentric
2 464128232213
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 707070666156
→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 on page 26.
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