Vertical Dimension for Closely-Spaced Sprinkler?

4/7/2020

I am an architect and appreciate the information being shared here, very clear and helpful. We are working on an atrium and working in accordance the Closely-Spaced Sprinklers (for Atrium Enclosures).

In the details for the closely spaced sprinklers there is a horizontal distance of 4-12" from the glazing to the sprinkler - is there a separate vertical dimension that must be met? We have glass that is 11'-4" in an open/exposed ceiling that is 13'-5" high (at boundary of atrium).

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6 Comments

Wayne Ammons

4/7/2020 07:50:59 am

Is the intended use of the closely spaced sprinklers to provide glazing protection to achieve a fire rating? Can you reference what code and section the details you are looking at are from?

Keith Heckler

4/7/2020 10:12:18 am

Contact me directly and I can share with you photographic arrangements found through North America to help you see other installations. keith.heckler@fema.dhs.gov

Greg

4/7/2020 10:31:47 am

Hi, I am a MEP engineer. Appreciated if you could enlighten me if NFPA and FM Global asking for standby fire pump to be an engine-driven pump. From my reading of the standards, I couldn't find the statement. However, there are many senior staffs and clients keep telling me that if the fire protection system to comply with NFPA or FM Global, then an engine-driven pump is required for standby.

Hope everyone is well and healthy during this period.

sean

4/7/2020 04:16:37 pm

Not counting insurance requirements NFPA 20 talks about 2 different reasons to require a pump to have a secondary power source (day tank w/ refill contract, ATS and generator, etc.).

Those are if the power supply is deemed not reliable or if the pumping capacity is greater than their apparatus. ie if your pumper can only supply up to the 8th floor but its 10 stories tall then you need to ensure that the pump will run.

If you talking about a second fire pump then there is some poorly worded language for extra tall buildings (420 ft) to have redundancy, but they miss a few issues they only directly address the additional water supply.

I hope that helps if not please reply.

Mike

4/7/2020 10:36:05 am

Tyco and Reliable have window sprinklers. It's best to check their data sheets.

sean

4/7/2020 04:17:51 pm

the MFG requirements and the ES report cover both. Make sure you read both as they sometimes are on different revisions.

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Vertical Dimension for Closely-Spaced Sprinkler?

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