Salt water is a non-potable water source, so all of those rules, such
as return bends or dry pendents, would apply. Also, salt water has a
different density (64 #/cuft vs. 62.4 #/cuft) so Hazen-Williams does
not apply. You should use a program with Darcy-Weisbach. (I designed
a system for a series of high-speed ferries several years back. At
that time I did a little research and found that the C factor in H-W
could be modified and it would approximate a correction for the
differing density of the water, but that was only empirical. You
should use D-W). All devices and pumps should be Monel or similar
coated. Chapter 17 of NFPA 13 (2002) on Marine System should give you
some good insight. It is allowed, but you need to look at the impact
of the water.
The systems on the ferry boats are dry and we recommended flushing
them with fresh water after each time they were filled with the salt
water. Perhaps a perioding flushing regime with fresh water would be
an appropriate maintenance item.
Good Luck
At 03:28 PM 1/16/2009, you wrote:
Does anyone know of any special procedures required for salt water
supply for fire sprinkler system? is it allowed? any code references?
George Medina Jr.
Sr. Fire Sprinkler Designer
95-1015 Ka'apeha Pl.
Mililani, HI 96819
808-388-5974 CL#
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Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
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860.535.2080
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