well you know the answer to the first one (as a NEW installation using
the prior design). If you are not changing like for like, I would
inform the AHJ of the change and explain why it does not need
extensive verification. Galvanized pipe has less friction loss so no
problem. Changing from sch 10 to sch 40, not so good unless up-sized
etc etc
Roland
On Jan 12, 2011, at 8:43 AM, Todd Williams wrote:
So where is the cut-off between repair and new installation? If you
replace all of the existing pipe, fittings, sprinklers and hangers,
etc. with exact new duplicates in an existing 30,000 building, is
that a repair? If you replace some black steel pipe with galvanized,
does that now become a new installation?
At 11:32 AM 1/12/2011, you wrote:
NFPA 25 does not require verification for repair work (provided you
are replacing like with like). Verification of adequacy per
specification is a different story that may have nothing to do with
what is required by the standards. Some reasons can be less than
honorable.
Roland
On Jan 12, 2011, at 8:14 AM, Doug Hicks wrote:
The dry pipe protects the overhang of a walkway, no attic. the
original install is about 20 years old. About 6 years ago, 2 more
low hazard buildings were built and the dry pipe system was
extended. The 2 new buildings are each protected by a separate wet
system. All the fire water comes from the original street
connection. The extension increased the protected area about 35-40
%. I assume hydraulic Calcs were done by a licensed person. I tried
to type that with a straight face. No increase in pipe sizes were
done. I do not know what edition of 13 was used for any of the
sprinkler work. I doubt that any water supply information is on
file anyplace. So if Calcs are needed, I will have to have a
qualified person do that for me. My local AHJ allows do whatever I
want. So the decision will be up to the client and his engineer.
I will print this out, we have a meeting at 9:00 AM. After the
meeting I am sure I will have more questions.
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Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, CT
860.535.2080
www.fpdc.com
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