purpose of manifold 2

[twd22285]

How does a manifold in the riser work. I know this is basic knowledge to most of you out there but i am new to the designing of fire sprinkler systems and am looking for a simple and clear explanation on the purpose of a manifold and how it works. thanx

 

[stookeyfpe]

I can you a detailed explanation or you can just click below. Scroll down and look at the 6 inch manifold.

I love the size of that riser room!

http://images.google.com/imgres?img...num=10&um=1&hl=en&rlz=1T4SUNA_en___US210&sa=N

 

[cdafd]

twd22285

what are you defining as manifold???

 

[stookeyfpe]

The horizontal section of pipe feeding the vertical risers. A manifold can have a vertical or horizontal orientation.

If you own a automobile, look under the hood. The manifold connects the valve outlets for the engine exhaust to the piping that connects to the muffler.

 

[cdafd]

ok stook you know what a manifold is, you get a gold star, but twd22285 may be refering to some other part of the system and using manifold for that part.

 

[SprinklerDesigner2]

A single sprinkler "riser" can cover up to 52,000 sq. ft. or 40,000 sq. ft. depending on the occupancy. Light and ordinary hazards have a coverage area of 52,000 sq. ft. while Extra Hazard and storage occupancies are limited to 40,000 sq. ft..

A single run-in can serve multiple fire sprinkler systems each served by a riser fed from a manifold.

The photo below shows a single manifold with two risers each riser serving 40,000 sq. ft.

http://207.44.144.49/~myfiresp/about/typicalriser.jpg

 

[twd22285]

sprinklerdesinger 2,
whats the purpose of the manifold then? why is it there? The comppany i work for gives me a riser detail with a manifold on it but they don't tell me the purpose of it or why its on the riser.

 

[SprinklerDesigner2]

twd22285,

The only time a manifold would be advantageous is when the building requires multiple risers due to its large size. Large size means exceeding 52,000 sq. ft. in a light or ordinary hazard occupancy or 40,000 sq. ft. in extra hazard or storage occupancies.

In this photo

http://207.44.144.49/~myfiresp/about/typicalriser.jpg

we have a single run-in which is split into two systems, each system covering 40,000 sq. ft., for a total area of 80,000 sq. ft..

If the building is less then 52,000 or 40,000 sq. ft. there is no reason to have a manifold.

 

[twd22285]

thank you that helps

 

[cdafd]

twd22285

You are talking about the one pipe that a number of systems are fed off of??? right????

my answer to your last question would be you do not have to run a seperate underground main for each riser.

So if say your building had eight risers, option of running one underground to the manifold or running eight seperate underground mains to each individual riser. AS in saving money.

The though is you only have one fire in the building at a time, so the one underground can meet the demand of the most demanding system.

 

[TravisMack]

Are you referring to the "manifold" piece that contains a flow switch, test -n- drain and gauge kit. That is also referred to as a riser manifold in some parts.

It is the same diameter as the riser, typically grooved on both ends and 13" in length.

Travis

 

[twd22285]

that all helps, but i guess what i am trying to understand is what actions does the manifold have in order to replace several undergrounds. if i'm not making sense i'm sorry, just tell me to zip it!!

 

[twd22285]

travis mack.

i just got your post i am pretty sure thats what i am dealing with

 

[TravisMack]

TWD,

If that is what you are dealing with, you can confirm with this link:

http://tyco-fire.com/TD_TFP/TFP/TFP962_04_2006.pdf

If this is indeed the item, it is just a UL Listed assembly that comes as one unit containing the flow switch, gauge and test-n-drain. It saves the fitter from having to attach each piece to the riser separately.

I hope that helps. I understand and remember the frustrations of learning "sprinkler - speak" It is a different language all together. I hope you are getting some good mentoring from your company. It will go a long way to help you in the future.

Travis

 

[twd22285]

travis mack
thank you. I am certain now that thats what i am dealing with. thank you all for your patience. much appreciated

 

[cdafd]

Oh the MANIFOLD!!!!!

twd22285

Sounds like they need to let you out of the office and see the real world. About the best time is during hydro test and final walk through of a system.

 

[twd22285]

cdafd,
Oh the MANIFOLD!!!!!hahaha

I'll work on getting them to do so, thanks for the advice