It depends on the original hydraulics. Was there an allowance
included for future arm overs/drops? If so, then how does that
compare? Was the system originally calculated based on 1500 sqft and
you could now use 900? What was the original spacing. It comes down
to being a judgement. At what point should it be done? If you think
that your work will negatively impact the hydraulics, then you should
do it. Also, the AHJ/Insurance company may have a say in this?
My question is regarding an existing light hazard system. We are
currently using the 2002 NFPA 13.
The system was calculated last year when this was a shell space as
light hazard. They are now fitting this space out, and have
submitted plans showing a number of arm overs and some additional
heads to accommodate the layout of the space.
The question has now come up as to if we should require calculations.
At what point would you say the calculations were needed for this
type of work?
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Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
www.fpdc.com
860.535.2080
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