Roland,
You're right. FM did a fire test with ignition centered between a
pendant and an upright, and it worked fine.
Uprights are significantly more tolerant of obstructions than pendants,
but they are significantly less effective against a fire. The maximum
protection comes with unobstructed pendants. The minimum tolerable comes
with pendants.
Anyone designing with uprights simply because it's easier to not worry
about obstructions needs to remember that he is not getting the same
protection he would if he used pendants and avoided obstructions. It's
another one of those decisions that designers make without the building
owner knowing that he's getting less for his money in the long run in
exchange for making the designer's life easier.
There is no such thing as a free lunch!
Joe
Roland Huggins wrote:
No restrictions that I am aware of.
If memory serves me right, FM made an earlier statement that
localized upright ESFR sprinklers could be used within an otherwise
pendent ESFR system. That had to break the heart of the mfg that
developed the first upright (since they are far superior in regard to
obstructions).
Joe - any comments?
Roland
On Jan 25, 2007, at 9:31 AM, Dan Arbel wrote:
Dear All,
What is your opinion regarding the use of upright and pendent ESFR
sprinklers in the same area?
What about mixing brands of different manufacturers?
Dan
Dan Arbel Risk Eng
T: +972 (04) 8243337
F: +972 (04) 8243278
M: +972 (052) 2810593
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