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PIPE & OPEN-WEB JOISTS
GIVEN
d
pipe diameter
0.5
0.75
1
1.25
1.5
2
2.5
3
4
5
6
8
10
12
14
16
in
L
joist spacing (center to center)
ft
D
total depth of the joist
in
W
width of the chord of the joist
in
h
height of the chord of the joist
in
l
total cut length of the pipe
ft
PIPE RISE CONCEPT
g
length of opening (gap) between joists
ft
g = L - (W / 12)
r
slope of the pipe as it slips past joist
in / ft
r = (d + h) / g
∆d
total rise of the pipe above bottom of joist, when slipping past joist
in
Δd = l x r
∆o
available height for pipe to slip inside of top chord
in
Δo = D - h
l
m
maximum length of pipe given joist parameters
ft
l
m
≤ (D - h) (L - W/12) / (d + h)
SIMPLIFIED FORMULA
l
m
maximum length of pipe given joist parameters
ft
l
m
≤ (D
2/3
+ g
2/3
)
3/2
ED MILLER AFSA FORMULA
l
m
maximum length of pipe given joist parameters
ft
l
m
≤ (D / 6) x L
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