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NFPA 15 - Rundown Time

Question asked by chong on Mar 13, 2020

As per NFPA 15, when rundown is contemplated, the distance between nozzles at different levels or elevations shall not exceed 3.7m measured along the surface. 

For the vertical spacing of the spray rings to the tanks, am I correct to say that this rule does not apply to storage tanks?

If Yes, how do we determine this rundown time of 3.7m spacing? 

Is there any requirement to determine the 3.7m maximum "run down" detailed in NFPA 15 for protection to Vessel.