At one time,I believe there was an FM requirement for wet pipe to slope for drainage. I don't see the requirement in the most current version of Data Sheet 2-0. The the requirement go away?
I have a highrise where the interior stairwells jump all over the building rather than being a straight vertical stair. We are seeing this a lot lately. Like it is some kinda design trend or something lol. Most of the time, this isn’t a big deal and we are able to make any necessary transitions...
So, NFPA 13, 8.15.4, 2013ed. states that certain types of unenclosed floor openings are to be protected with closely spaced sprinklers where sprinkler protection serves as the alternative to enclosure of the vertical opening. What method do you guys use to determine if the opening requires...
I have a highrise building with the two FDC’s as specified in NFPA 14, 2013 ed., chapter 7.12.2. The FDC’s are two inlets each. This is in compliance with 7.12.3.3, even though the total standpipe demand is 750 GPM.
In some situations with a greater standpipe demand, we may have one FDC with...
I have a building with a pump and a RPZ in the vault outside. During the pump rated flow of 750 gpm, the RPZ has considerable loss (About 9.5 psi. My concern is at pump churn how to accurately calculate the available suction pressure so I can calculate the maximum churn pressure. If I understand...
I am designing the sprinkler system for a building with escalators that traverse multiple floors. As much as I would like to eliminate sprinklers from below the escalators, I don't think I can since they are greater than 4' wide. I attached a picture of a similar layout for the escalators to...
Good Morning Folks,
NFPA 25, 2001 ed. section 13.5.1.2 requires that sprinkler pressure reducing valves be full flow tested every five years and the data compared to previous test results. To me, full flow testing means testing at system demand, however, the annex material in A13.5.1.2 seems to...
Hey folks.
I am designing a high-rise mixed use building. The building is primarily a residential apartment building that sits on top of 8 floors of parking. There is also 5 floors of retail\office attached to the parking structure. We will have high pressure standpipes with PRV's in the two...
The figure referenced in the title shows two pressure reducing valves to comply with the requirements of 7.2.4. I am in a situation where we will have multiple hose valves down stream of a PRV, so we will be adding a second PRV to comply.
Does the first PRV have to have a higher inlet pressure...
It is a fairly common occurrence to have partially sprinkled parking structures in my neighborhood (Atlanta). We see a lot of situations where a seven story parking deck might have a few levels underground that are sprinkled, with the rest of the deck not being sprinkled. In these situations...
I have a room where the lights are surface mounted to the bottoms of the concrete tees. Since the room is concrete tee construction, am I limited to NFPA 13, 8.6.4.1.2 paragraph five, or can I apply paragraph one? If I can apply paragraph one, I can put my deflector six inches below the bottom...
I am referring to the 1/2" ball valves typically found in the trim of Alarm\Dry\Deluge valves. NFPA 13, 2013 8.17.1.4 states that these valves should be sealed, locked, or electronically supervised. These are almost always 1/2" ball valves, and I don't think any of them are lockable ball valves...
Does the IBC base the requirement for standpipe installations on a certain number of stories? I do know that building height and occupancy are factors, but I didn't see anything about the number of stories being a factor.
We have a project where we have encapsulated storage of class IV commodities on racks, and the FPE has specified the criteria to be in accordance with NFPA 13, 16.2.1.3.2(g). I am trying to make sure we have the correct K Factor for the rack sprinklers, but I seem to be overlooking it. 16.2.4.4...
We have a couple rooms that have multiple pockets in the concrete structure as shown in the attached photo. We requested that the owner install a lay-in, tile ceiling in the room to avoid sprinklers in every pocket. The owner declined the ceiling stating that all the exceptions in NFPA 13...
I have a project where the client has a specified Testing Engineer that is required to witness the hydrostatic testing, in addition to the local AHJ. The Test Engineer has made us re-test every system we have installed, some as many as six times. At the start of the hydro test, he will report...
I have a project where the municipal water pressure had a peak pressure of 169 psi when we did a 24 hour test. The building has an existing system, but no pressure relief valves, and thermal expansion has been raising pressures to as high as 250 psi on some of the systems. Obviously I will be...
Does NFPA define hydraulic criteria for wall hydrants? I have looked, but if it's there, I missed it. There is a FPE involved in this project, so I have asked him to define the calculation criteria. I was just wondering if I overlooked it somewhere.
I have a retrofit project that requires seismic bracing. The unique situation here is that the concrete structure is 18 feet above the ceiling. If possible, I want to prevent running the main and lines up high.
I'm not sure as to the best way to brace this system when the pipe is installed...
