Situation about riser and crossmain

[AN1010]

Good day everyone, i have a situation about the building. just open the attachment. hope someone can help me. you see in the 4th floor of this building there is only a partial area. the left side and the right. and the middle is the roof for the third floor. my problem is that if a run a crossmain directly to the left side it would be too long. 66meter. im thinking to connect the left side to the crossmain for the third floor. is that a valid idea or still the standard nfpa? please help me. thanks a lot.

 

[PEDARRIN2]

Depending on the building code, if the fourth floor is above 30' above fire department access - you would need to have standpipes per Building Code and NFPA 14. The standpipe would be located in the stairwell so you could bring a sprinkler main off of each standpipe in each stair on this level.

If the lower levels are less than the maximum (I think it is 52,000 sf), the sprinklers on those floors could be from either riser.

That is how I would do it.

 

[ZDR1985]

im thinking to connect the left side to the crossmain for the third floor.

That is not a good idea, that is a different zone.

Put riser on both side of the building instead.

 

[MatthewJWillis]

Check 8.16.15.1 of the 2013 edition of NFPA 13.
Also, if you did run the 66 meters across the roof, How do you comply with protecting the pipe from not only freezing, but fire. Also located in 8.16?

R/
Matt

 

[TravisMack]

Put the floor control valves on L3 for for L3 and L4. Run bulk pipe from the L4 control valve assembly on the 3rd floor. Rise vertically where needed to get to each side on L4. It will take some creative routing and hopefully you have enough clearance to make it work.

Travis Mack
MFP Design, LLC

http://www.mfpdesign.com

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[AN1010]

Thank you everyone for the advice. Really appreciate it.
@TravisMack sir Travis i just want to clarify about the term bulk pipe. is it similar with feed main?

 

[AN1010]

by the way, the location of the fire pump is above the level 4 right side.

 

[TravisMack]

Yes...Bulk and Feed main are typically synonymous.

Travis Mack
MFP Design, LLC

http://www.mfpdesign.com

"Follow" us at

https://www.facebook.com/pages/MFP-Design-LLC/92218417692