3/4 head in 10' and above ceiling?
3/4 head in 10' and above ceiling?
(OP)
i was always told that in a ceiling above 10' use a 3/4 head is that true or am i able to still use a 1/2 head? is it all based on k-factors? are they using 3/4 cuz of the flow?





RE: 3/4 head in 10' and above ceiling?
Travis Mack
MFP Design, LLC
RE: 3/4 head in 10' and above ceiling?
Densities less then .20 use a K of 5.6
.20-.34 K of 8
.34 or greater K of 11.2 or >
So if u are greater then a K 11 it will be 3/4", most K 8 and 5.6 can use a 1/2".
Do not know if this helped at all.
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Fire Sprinklers Save Firefighters' Lives Too!
RE: 3/4 head in 10' and above ceiling?
On my watch, I wouldn't accept what you guys are talking about, unless we are discussing the final union fitting.
RE: 3/4 head in 10' and above ceiling?
Did you get my e-mail on your upcoming sweaty Texas holiday?
RE: 3/4 head in 10' and above ceiling?
I believe he is talking about utilizing a minimum K8 sprinkler (3/4" thread) in anything that has a ceiling greater than 10'. For 10' and less, it would be a K5.6 (1/2" thread). That was my assumption. And yes, any drop feeding those sprinklers would be a minimum of 1".
I vaguely recall a requirement from Las Vegas that when they had ceilings >20', they required a minimum K8 sprinkler. I further believe that they also made you increase the design area to 100x the ceiling height. So, a 25' ceiling in a casino lobby would be K8 sprinklers and a 2500 sq ft design area. I am not 100% sure on that.
However, there is nothing in NFPA 13 that mandates a K8 sprinkler when your ceilings are >10'. The only time that NFPA 13 mandates K factors is due to increasing densities.
Take care!!! Have a great weekend.
Travis Mack
MFP Design, LLC
RE: 3/4 head in 10' and above ceiling?
Check your work e-mail.
Tom
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Fire Sprinklers Save Firefighters' Lives Too!
RE: 3/4 head in 10' and above ceiling?
RE: 3/4 head in 10' and above ceiling?
Got it, worked it out, and I look forward to seeing you and your family at the end of June.