Waste Chute

[Awowa.]

Hi everyone,

Do we need to calc fire sprinklers inside a gravity waste chute in order to size the piping ?
i looked at NFPA 13 and NFPA 82 and there's nothing about a number of sprinklers, gpm/ft or anything i could use to get an idea.
The installation must be per NFPA 13 but how size the piping feeding those sprinklers ?

Thanks !

 

[cdafd]

How many sprinklers in the chute and bottom floor??

Are these the only sprinklers in the entire building???

 

[Awowa.]

there are 8 sprinklers in the chute and the building is entierly sprinkled.

 

[stookeyfpe]

See NFPA 13 (2016 edition) Section 22.15. No special calculations are required and pipe diameters shall comply with NFPA 13 Section 23.4.1.2. NFPA 13 refers to NFPA 82 for any special conditions such as gravity chutes with shaft liners.

 

[Awowa.]

Thanks for the information, i will take a look.

 

[stookeyfpe]

As you should.

 

[Awowa.]

well, i allways do, but like i said there's nothing clear about this and correct me if i am wrong but there's nothing close to "No special calculations are required and pipe diameters shall comply with NFPA 13 Section 23.4.1.2." in chapter 22.15 for gravity waste chute or at least i still didnt find it. There's just nothing about calculation and there's no reference to 23.4.1.2 anywhere.

The only place i see something close to 23.4.1.2, is for waste compactors 22.15.2.4.3 and not a gravity waste chute.

 

[UFT12]

Awowa, maybe you have misinterpreted the "No special calculations" comment. It basically means you just go ahead by sizing the piping like any other piping far from your design area. I guess sizing your branch lines that are not going to be calculated is not a question. I take it you have less sprinklers in the chute than your design area and therefore a fire in the chute is not likely to overtax the system.