You just opened another can of worms. Yes NFPA 13 says water filled weight
of pipe plus 250# (The maximum expected weight of the fitter falling from
his ladder, and hanging on the pipe. Simple huh? Not once OSHA got into it.
OSHA requires that if your working more than 6'-0" above the floor (Or could
fall that far) (I once asked if a guy 6'-4" tall fell down did he exceed the
6'-0" fall distance, their answer was depressing, Yes his head fell more
than 6'-0" so he exceeded the height at which he should have been wearing
fall protection.) Anyway back to OSHA, they require that all personnel
working over 6'-0" above finish floor wear fall protection and that that
fall protection be attached to the "STRUCTURE" at a location with sufficient
strength to support the total load of a man falling 6'-0". (I think that
works out to 3480# of impact load, if the guy weighs 180#.) The sprinkler
system is not part of the structure, and your not allowed to tie off to it,
so why do we keep that +250 in NFPA 13? (The best two answers I've heard are
1) for those that don't understand the OSHA requirements, 2) Its just
another safety factor. (6'-0" AFF is for Commercial projects, Residential
says 11'-0" for some unknown reason other than the NAHB fought it and won. A
framer on one of our residential jobs fell 8'-0" from a garage ceiling and
died.)
Anyway the 6'-4" guy walking from the job site entry to the building needs
fall protection, Huh??? What are you supposed to do attach him to a Blimp
capable of lifting his impact weight? He wouldn't be walking any more would
he? The OSHA guy thought a simple Mono-rail from the entry to the building
would satisfy him. So the guys over 6'-0" tall could hook up as they came on
site. Lucky His boss was more understanding. His interpatation was that the
individual had to be raised at least 1'-0" above standing level (bucket step
ladder scaffold) before he would require fall protection. LOOK OUT GEORGE
YOUR PUSHING THE LIMIT!
Thom McMahon
Firetech, Inc.
2560 Copper Ridge Dr
Steamboat Springs, CO 80488-2136
Tel: 970-879-7952
Fax: 970-879-7926
----- Original Message -----
From: "David Canham" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Thursday, June 14, 2007 12:51 PM
Subject: RE: Hanging branch lines from panel points
Isn't the hanger required to hold 250 pounds plus the weight of the pipe
full of water? Not just the 23 pounds?
Dave Canham
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Matthew Stone
Sent: Wednesday, June 13, 2007 1:08 PM
To: [email protected]
Subject: Hanging branch lines from panel points
We are installing a grid system in a super store and the general contractor
is demanding that we hang all piping within 6" of a panel point of the
web-type roof joist. There is a detail showing sprinkler pipe to be
installed in this location and a structural drawing showing the location of
the main. We naturally installed the main to meet these criteria. The
branch lines are run perpendicular to the joists so hangers for the branch
lines are spaced at 6'-0" apart which is at every joist. This means that
there is a 23 lb load at each hanger. Table 9.1.1.6.1(b) requires a 2 × 2 ×
1/8 angle iron and the joists have a 2 x 2 x 3/16 angle iron on top.
Has anyone else come across this requirement in the contract drawings and
had it applied to all sprinkler pipe?
We can use trapeze hangers to meet this demand by the GC but it will also
raise the question in those of you who look up when you are in super stores,
"Was this system installed by a licensed contractor?"
Matthew Stone
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