Unique Owner Standard

9/13/2017

A healthcare system standard states to allow for Light Hazard sprinkler spacing, but require Ordinary Hazard hydraulic calculation and pipe sizing. Has anyone done this before?

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3 Comments

David

9/13/2017 11:19:19 am

We have done this on occasion to mitigate for other construction / code challenges. By Hydraulically calculating to an OH density you are allowing for more water to get to the fire.

By still allowing the Light Hazard classification you do not run into issues with spacing or other OH provisions needing to be met.

JAMES

9/14/2017 06:23:36 am

It seems as though in calculating to OH it would mostly affect pipe size, correct?

Hydraulically speaking it would be somewhat taxing to have sprinklers spaced up 225 sqft and 50% to 100% more water through (depending upon 0.15 or 0.20 gpm/sqft calculation). I guess, however, using K8.0 sprinklers some of the pressure loss or 'pinch' at the sprinkler could be lessened.

David

9/14/2017 08:14:51 am

Correct you would be affect pipe size by calculating more water to the remote area.

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