who knows chris? 15 max btwn heads, 1 hngr per head=15 max btwn hngrs?
13 is a standard-- you ever had a STANDARD JOB? standard vs.
performance is mutually exclusive. 13 is the result of engineering,
broken down in to tables of 'best fit', i.e., ok, lots of 16" inch
beams, plus 6"= 22 max, etc. even if "performance" is the way of the
future, 13 will not reflect that any more than 13-1896, until we stop
calling anything standard.
Quoting "Cahill, Christopher" <ccah...@burnsmcd.com>:
Anyone want to theorize or are old enough to know why the limit of
15' on hanger spacing? Got a process piping rack the sprinkler
mains will be on (no choice, it's complicated) where they want to go
20' between. I know there are engineering outs in 13 but when the
process engineer asked why all I had was I didn't write the code. I
don't mind that answer but the question intrigued me. Structurally
holding the weight shouldn't be a problem or at least can be
calculated. Thought maybe the couplings might be a limiting factor,
but then the limit is the same for all schedules of pipe and joining
methods and sizes from 1.5" to 8" so it has the smell of it was in
the 1896 edition and no one every figured out how to make a buck off
changing the limits as we developed new pipe and joints so it remains.
Chris Cahill, PE*
Senior Fire Protection Engineer, Aviation & Facilities Group
Burns & McDonnell
8201 Norman Center Drive
Bloomington, MN 55437
Phone: 952.656.3652
Fax: 952.229.2923
ccah...@burnsmcd.com<mailto:ccah...@burnsmcd.com>
www.burnsmcd.com<http://www.burnsmcd.com/>
Proud to be one of FORTUNE's 100 Best Companies to Work For
*Registered in: MN
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