NFPA 15 - Water supply duration

[UFT12]

I just wanted to know one thing. In a fully sprinklered building, type II(000) that requires additional column protection from a fixed spray system, what would be the water supply duration for the fixed system? I ve looked in NFPA 15 which doesn't seem to cover that. Section 7.1.10.3 throws me to 9.2.1 and vice versa. Have I overlooked something or isn't there any guidance to that? I would assume the duration required be equal to the durations in chapter 11 of NFPA 13 but is that realy true? Would make sense. If so, any reference to any code that sates that?

Thank you for any help on this.

 

[cdafd]

Not an engineer or designer

But if you are designing the rest of the building to NFPA 13, than that drives the water duration.

Which edition of 13 are you in???

Or are you designing to another standard ?

 

[UFT12]

Thank you for your reply. I 'm not designing the system but I need to give water supply requirements much before any designer comes into play.

 

[cdafd]

So does it have to meet NFPA 13

Or some other NFPA standard?

 

[cdafd]

I am thinking you have to meet NFPA 13, and the duration would be the same as for the design for the system for the building

 

[UFT12]

Yes. It needs to meet NFPA 13 and other applicable NFPA standards.

 

[stookeyfpe]

I am confused about the question and answers. First, what standard or code drives the protection of columns in a Type III-b building? Secondly, how is a NFPA 15 water spray system being suggested as the basis of compliance when the scope of the standard requires the design to contemplate either extinguishing the fire, protection of equipment, exposure protection, or prevention?

If you are inside a building the only cases where protection of columns is required is in cases where high piled combustible storage is found and only under certain cases. The prescribed solution is a sidewall sprinkler located 15 feet AFF and these sprinklers are excluded from hydraulic calculation.

If you don't know the difference between a NFPA 15 water spray system and a NFPA 13 automatic sprinkler system you clearly need to find a design professional to help you in whatever you are trying to accomplish.