>From the NFPA 13 Handbook -
The intent of 6.4.6.1 prohibits the use of bushings where a one-piece
reducing fitting is commercially
available at the time the system is installed.
For other than the circumstance cited in 8.14.19.2, in which bushings are
temporarily installed
to facilitate an unrestricted flow to sprinklers installed below a future
drop ceiling,
bushings can be used only where reducing fittings are unavailable. Bushings
have poorer flow
characteristics than reducing fittings and have a greater tendency to leak.
The use of bushings under all but the most pressing conditions is
discouraged. For example,
a particular fitting may actually be manufactured but may be backordered
for several
months. If the proper reducing fitting cannot be obtained after an
exhaustive effort, then the
use of bushings can be considered.
The final word should be from the AHJ. A good contractor will coordinate
with the local AHJ and get his concurrence on the use of bushings before he
installs them.
Thank You
Rahe Loftin, P.E.
Region 7 - GSA
Office - 817-978-7299
Fax - 817-978-8644
Cell - 817-371-3102
"Greg McGahan"
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If you know....
Please tell me the intent of the 6.4.6 limiting the use of bushings to
reduce pipe sizes.
If there are existing ¾" reducers and ½" sprinklers are needed, what
detrimental effect would there be in using a ¾" x ½" bushing? I fail to see
the potential negative impact.
Thanks,
Greg
Living Water Fire Protection, LLC
1160 McKenzie Road
Cantonment, FL 32533
850-937-1850
Fax: 850-937-1852
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