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Click to view content  As per NFPA 25 Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems, in Chapter 8, the it states that if readings are above 95% of rated pump pressure, investigation shall be done.  My question is, does the above clause is for the NEW installed pump or for maintaining an existing pump? and… (Show more)
in Fire Protection Systems
I read NFPA 291 Section 4.9 about flow testing without a pitot gauge, but I do not understand where to get the variables. Can anyone help explain the process a little better to me?
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We have a Type 3 construction of a retrofit of 100 year old assembly building with concealed space below the 1st floor that meets all the requirements of The AHJ has questioned us, What is (3) Tight Construction?  There is no access doors into crawl space from the 1st floor or exterior. Crawl space is less than 3,700 sq ft. The… (Show more)
in Fire Protection Systems
As per NFPA 13-2019 chapter for design densities between 0.2 to 0.34 gpm  CMDA sprinklers with K-8.0 or greater can be used. However, in the market from my research, there are no  listed CMDA sprinklers for storage applications with K lesser than 11.2. Is it possible for storage application to use non listed as CMDA storage sprinklers… (Show more)
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I'm designing a sprinkler system in a ceiling area. I've decided to place sprinklers under and above the ceiling since the ceiling itself is combustible and there are also all electrical and HVAC installations. Are there any additional flow requirements to contemplate sprinklers above the ceiling? thanks   Estoy haciendo el diseño de un sistema… (Show more)
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Are there any occupancy restrictions where a double interlock preaction system may be used?  For example, could an entire hospital (Institutional) provide sprinkler coverage with a preaction system?  It appears that if they meet size limitations, follow sprinkler head listings, and meet water delivery times that it would be acceptable.   … (Show more)
in Fire Protection Systems
We have designed three dry systems for an nursing home in Tenn..  The building is divided into (3) riser systems. Each Riser covers Attic Area and Living Area in it section. Upon plan review, the State Health Building Inspector quoted NFPA 13-- - (For Dry Pipe Systems protecting dwelling unit portions of any occupancy, the sprinklers in… (Show more)
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Good Evening all, What is the difference between AWWA compliant ductile iron pipes and ISO/EN compliant ductile iron pipes? What may go wrong if I replaced them?   Regards,
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