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Hi All, Thanks for all the excellent advice and information, we are on the road to a resolution with Insurer and Consultant now agreeing that 12.5.1 does not apply in this instance.Now we just need the end user to agree! Thanks again. Dave

Guys, Thank you all for the feedback, it's all good stuff,very informative and has helped me to understand my situation a lot better, I can now see where the Consultant I am dealing with is coming from. However... The Single Interlock pre Action System I am looking at is at Roof Level above...

Hi All, Can anyone provide clarification on NFPA 13 12.5.1 where it states 30% increase in area shall be applied to Dry Pipe & Pre Action Systems. Does this include Single Interlock Pre Action Systems and is there a clause in NFPA 13 that clarifies? Thanks Dave

Thanks...to clarify, the Tanks are Fixed Cone Roof, product stored is diesel Fuel Oil used as a stand by fuel for a GE Turbine on a Power Plant in North Africa. DavidCR the fact is the opposite, the customer does not want the run down area to be calculated in the water demand, only the area...

Thanks for your reply. However I think, my original post was not clear.The issue is not the request for complete coverage with overlapping spray patterns from the nozzles. The issue is that our customer does not want to include the run down area in the hydraulic calculation ...this does not...

Dear All, We have a situation where our customer has specified the area of operation for a Storage Tank Deluge System for exposure protection without including the area for rundown i.e. the area of coverage to which the design density is applied is calculated by the area covered by the Spray...

Gentlemen, Thank you very much for the clarifications. Dave

Hello All, Can someone please advise if the requirement to increase the area of operation by 30% is applicable to Single Interlock Pre Action Systems? I can see from the Code that it is a clear requirement for Dry Pipe and Double Interlock. My application is a non storage environment and the...