NFPA 13 maximum area protected per riser

onthewaytopro · Feb 25, 2021

Hi! I'm new to design on fire protection. These are my questions regarding the maximum floor area per riser.
1. If the building I'm about to design has multiple floors, is the maximum floor area accumulated on all floor?
2. If I exceed the maximum area per riser do I need a new fire pump for that? 1 pump per riser?

Thank you!

MGXFP · Mar 5, 2021

The maximum allowable area is for each riser. The "riser" is the assembly with a control valve, check valve, flow switch and drain. For light and ordinary hazard areas, one riser is allowed to protect up to 52,000 square feet. Storage risers may protect 40,000 square feet.

If your building is more than two stories in height there must be a separate riser for each floor at a minimum. Otherwise you may have a system protect two floors if the combined area is less than the maximum allowed for the hazard.

carlosgw · Mar 22, 2021

I'm glad I looked at this thread.
We are on NFPA 13-2016 in NY.
It's 52,000SF/floor.
In 2016 they added some stuff about more than two floors. (I just saw this - hence why I'm glad.)
I just looked at 2019 and it looks like they completely rearranged to standard. Can some one point out where is area requirement is in 13-2019?

stookeyfpe · Mar 26, 2021

NFPA 13 was completely revised in the 2019 edition. So exactly what are you asking?

Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

NFPA 13 maximum area protected per riser

onthewaytopro

Mechanical

MGXFP

Mechanical

carlosgw

Mechanical

stookeyfpe

Specifier/Regulator

Similar threads

Part and Inventory Search

Sponsor