ESFR sprinkler systems are becoming more common in warehouse
and industrial type buildings. Traditionally in these types
of buildings, it is necessary to drop down sprinkler heads
if storage racking is installed.
Drop down sprinkler heads
can:
1) be expensive to install
2) require modification if the racking layout is changed,
and
3) be easily damaged through the movement of goods
With ESFR sprinkler systems, there is no need for drop down
sprinkler heads, in most cases. ESFR sprinkler systems provide
greater water flow, so water can reach the lower areas. This
greater flow is accomplished by using larger diameter sprinkler
pipes and sprinkler heads with larger orifices.
Another consideration, particularly if retrofitting ESFR
sprinklers, is the size of the water service pipe to the
building and the amount of water pressure under flow on the
street. These factors are considered during new construction,
but would have to be re-considered if retrofitting in an
existing building. If there is insufficient water on the
street, it may be necessary to install fire pumps and/or
water storage tanks.
During new construction, the cost to install ESFR sprinklers
is generally less than the cost for conventional sprinklers
and drop down heads. Plus, ESFR sprinklers provide greater
flexibility to the building user. This would arguably increase
the building value.
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