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Does anyone no offhand the FM requirements for monitoring pressure on a dry system? Specifically, if the high air pressure has to be monitored.

The points are being monitored by the main building fire alarm system. My question is does that tie have to be protected with overvoltage device? Is the requirement in NEC or 72 or just good practice?

For a data center facility, there is a remote hut that has some electrical/fiber equipement. It has its own fire suppression and fire detection system. Am I required to have overvoltage protection on the fire alrm lines when leaving the building to monitor this hut? thanks in advance

Thanks, I just heard Honeywell is coming out with a fire-gas combination detector. They're combining their specialties of the fire groups with honeywell analytics to address this issue.

Section 908 Emergency Alarm Systems calls for a local alarm and an alarm at a constantly attended location, it also refernces requirements in section 415 for occupancy H. Do these systems need to be monitored by the fire alarm system? Specifically the fire alarm system needs to be monitored by...

California is adopitng NFPA 72 2010 effective january first, and I forget which east coast state by February. There are a lot of changes in this last cycle.

Purple star for the presentation, I thought it was good post. Here's more of their history from the website. http://www.fmglobal.com/page.aspx?id=01070000

I went to Viking Sprinkler Seminar. They have it on site in their facility in Michigan. They go over a lot of systems with hands on stuff plus instruction. And its free. I think Victaulic does one now too.

I second what everyone says.Recall that the code is a MINIMUM and reference. Always follow the more restrictive code and get feedback early from the AHJ aking for amendments. Keep the owner in the loop as PEDARIN2 suggests.

Has anyone used FHC Hydraulic Analysis by Canutesoft? I saw ads for jobs where the software was used. They do give a free 30 day trial, which I intend to download. Has anyone used it? If so what do you think of it? Thanks in advance.........

NJ1~ I don't think NFPA has say so on FM. When they are both on a project's specs, I've gone with the more stringent. Recall(as you already know I'm sure) the code is a minimum.

In statement #1 when they refer to "hydraulic requirements", do they mean that they defer to the area limitation of NFPA or that they are all out the window and to be just calculated to make the hydraulics work? Seems to conflict with #9. (ie. 52000 sqft on any floor served by a riser;or 100...

Either way its good design practice.

NewtonFP Good point Purple star for you

The plumbing code (ie IPC) limits the velocity of piping with a maximum velocity. We always ask for it on shop drawings/calculations in additon to sprinkler calcs. The IPC has maximum velocities: all piping 1/2 inch or smaller = 5 feet/sec. copper, 5/8" - 1-1/4" = 5 feet/sec. CPVC, 5/8" - 1" =...

rbulsara: Thanks for the puple star! I agree we don't do much telcom stuff though. We've been specifying a lot over the past year using air-sampling in data center work. The trend, at least here seems to be towards as over conventional detectors. Especially when we have a raised floor and...

I posed the question to the nfpa and got an official response to the question: After consulting with Ralph Transue, the former Chair of the Technical Committee on Telecommunications, I have an answer for you: The reason that NFPA 76 requires automatic detection systems with better performance...

I had a similar question in post http://www.eng-tips.com/viewthread.cfm?qid=212854&page=2 The folks in Tyco refered me to somebody who did this type of work on a job basis, so they could supply you with the calcs for a fee. I dont recall his price.

Thanks for the response guys, I absolutely agree with you rbulsara and see your point. However the point of a sampling air system is incipient smoke detection, as I'm sure you know. But in situations in 76 under the raised floor where there is a large volume and velocity of air being "churned"...

Hello all, NFPA 72 states that 5.7.3.3.2 that the maximum transport time for smoke from the most remote port in an air sampling systen should be 120sec. According to section 8.5.3.2.1.4 of NFPA 76 (2005 & 2009), the transport time is 90sec. Should environments that have a high degree of air...