FITTING PIPE INTO

OPENWEB JOISTS











GIVEN











d

pipe diameter





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


(Optional)



ft














PIPE RISE CONCEPT











g

length of opening (gap) between joists


g = L  (W / 12)



ft






r

slope of the pipe as it slips past joist


r = (d + h) / g



in / ft






∆d

total rise
of the pipe above bottom of joist, when slipping past joist


Δd = l x r



in






∆o

available
height for pipe to slip inside of top chord


Δo = D  h



in






l_{m}

maximum length of pipe given joist
parameters

l_{m} ≤ (D  h) (L  W/12) /
(d + h)


ft
















SIMPLIFIED FORMULA











l_{m}

maximum length of pipe given joist
parameters

l_{m} ≤ (D^{2/3} + g^{2/3})^{3/2}


ft
















ED MILLER AFSA FORMULA











l_{m}

maximum length of pipe given joist
parameters

l_{m} ≤ (D / 6) x L


ft
















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