Jimmy,
If it were me, I'd do the calc. Since you are tying into the gird,
you are not maintaining a pipe schedule back to the riser so you
can't really call it pipe schedule. Plus, you might be amazed at the
amount of friction loss that can be generated when you calc through a
grid to a single point to feed a tree system.
Todd
At 03:53 PM 3/26/2007, you wrote:
Dear Forum,
We are currently working on a project where we are tying onto a dry, gridded
sprinkler system, installed in 1985. There are two existing dry systems and
they each cover an area of about 13,100 square feet. The lower floor is a
tree system that was sized by "Table 3-7.1" of NFPA 13, 1984 Ed. The main
floor is a grid that was designed at a .275/ 3000 square feet with 500 gpm
hose allowance. The addition that we are sprinklering is only 2,000 square
feet. On the main floor of the addition there is a mezzanine of about 1,000
square feet. Is a calculation even needed for such a small addition, or can
we use the existing pipe sizing as our guide? If a calculation is required,
would we calculate the sprinklers along the roof deck by themselves, or do
we need to include the sprinklers under that mezzanine in our calculations
as well.
Thanks for the help
Jimmy Waite
Burtell Fire Protection, Inc.
[EMAIL PROTECTED]
406-652-7697
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Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
860-535-2080
www.fpdc.com
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