New Tool for Multiple Remote Area Adjustments

12/18/2019

I've been on a bit of a tool creation kick lately. Sorry, I just get excited sometimes.

This week I'm introducing a small portion of a much larger programming effort - this tool helps determine an adjusted fire sprinkler remote area based on the system type and density/area curves of NFPA 13. It can factor in the quick-response area reduction, sloped ceiling adjustment, double-interlock pre-action or dry increase, and high-temperature sprinkler decrease. I'll probably only have this up as a free version for a month or so before adding to it and incorporating the full tool in the Toolkit.

At the bottom of the tool you'll see a schematic remote area drawn with the parameters input. I'm using it when mocking up hydraulic calculations for estimation or when I'm first setting up a hydraulic calculation. Give it a shot and let me know what you think!

If you don't see the tool below, click here.

Artur

12/23/2019 01:31:19 pm

I'm a little bit confused as I always thought i should first reduce area by 25% for high temp sprk heads but not less than 2000 sf and then multiply by 1.3 for dry system. I would then end up with 2600 sf. 2500x0.75 = 1875 = 2000; 2000x1.3 = 2600.
Your excel does something different.
Could you tell me what I'm doing wrong?

Thank you!!!

Joe Meyer

12/24/2019 08:07:53 am

Great input Artur! This is a good discussion point so I've opened it up here: https://www.meyerfire.com/daily/when-to-apply-minimum-area-for-high-temp

As I see it the minimum 2,000 sqft applies to your final design area, so as long as your final design area meets 2,000 sqft then you meet the intent of 19.3.3.2.6. If you look at it another way, you could apply the dry-system increase first (x1.3), then apply your high-temperature adjustment and you'd arrive at a lower final remote area than you would if you rounded up to 2,000 sqft in the middle of the adjustment.

The handbook of NFPA 13-2019 A.19.3.3.2.8 states that it doesn't matter which reduction is applied first in their second example. Also, 19.3.3.2.8.1 states that the adjustments can be compounded, so I would think just reversing the order on your approach where you round up to 2,000 sqft at the end would arrive at the same basis as the calculator.

Artur

12/24/2019 08:50:50 am

Yeah when I look at this again you're right. Because high temp area reduction mixes probably only with dry area addition. So they could just say reduction is not 25% but less. So we should check if the area is more than 2000 after all factors are applied. The same with concealed unsprinklered - I check at the end if it's above 3000 and not at before I multiply let's say by 1.3.
I didn't really verify it before as this was only about 40 gpm added to the final flow.

Thank you!

Comments are closed.

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New Tool for Multiple Remote Area Adjustments

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