NYC 9/11 Public Portal Document
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4
R^d/2 + (a/2 ) « 3H/Stn 46^3'^6,66^ 8,66 ft,
Sin^2
Tst R tanA/2 Rtan45« 8,66*
es6"
b= a/2 -a/2 = 5.66-4^ 1,66
SinZ72 tanA/2
Thus the guidelines have not been met. Also no a,b or c dimensions are provided. Revise
the layout and else of the chamber per our guidelines. Submit computations far R,T
it and additional structural computations, Siov tt,b, and c dimensions for flov
redirection chambers.
7, We have been advised by our Division of Plant Operations (Wards Island) that the
aluminum stop planks as ^ovn an dvg. No, S- 34 are not acceptable. Wooden stop
planks should be used. Find enclosed casting for access cleanaut/manholes,
5
Vety truly youn,
I-
MAGDI FARAG, P,E„ CHIEF
Division of Sever Regulations it
Cohtrol, Bureau of Severs
NYC-WTC_000165317
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