Any Way Around Alternating-Risers in Highrise?

12/23/2022

I have a highrise that exceeds 400-ft in height. The engineer designed a combination riser with all of the floor control assemblies coming from one riser, and not alternating as is in code.

I'm wondering if there's something I'm missing - any way around alternating the floor control assemblies, like upper-level pumps being considered separate systems or something of the like?

Looking for better understanding here and being sure I'm not missing something bigger picture. Thanks in advance.

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5 Comments

Barry

12/23/2022 08:26:58 am

I am pretty sure the threshold is 420 feet on the IBC for that requirement. I am going off the hip and may be wrong there.

Moshe

12/23/2022 10:24:50 am

The building actually exceeds 500' so it definitely falls under that code.

Is there any Lee ways here ?

sean

12/31/2022 08:46:15 pm

sean

12/23/2022 02:45:31 pm

no.

this comes from lessons learned from 9/11/2001. the idea that any adjacent floor would at least have sprinkler protection during an emergency when one of the risers is lost

Alex

12/27/2022 06:36:37 am

Hi,

IBC 403.3.1 states that "each sprinkler system zone in buildings that are more than 420 feet in building height shall be supplied by no fewer than two risers. Each riser shall supply sprinklers on alternate floors. If more than two risers are provided for a zone, sprinklers on adjacent floors shall not be supplied from the same riser."

I am not aware of any exception to this code requirement.

Thanks,
Alex

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Any Way Around Alternating-Risers in Highrise?

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