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Pipe Coordination with Building Foundations?

6/7/2019

3 Comments

 
What is the ideal approach for fire sprinkler pipe to enter a building?

I find many engineer details show either an in-building riser (by Ames) or a ductile iron pipe with restrained pipe and fittings come under the building foundation and up into the building.

While this approach is acceptable, if we have the ability to coordinate with the structural foundation during design, would it not be better to drop the footing so that the fire sprinkler pipe can be sleeved through the vertical portion of the foundation wall?

I would think that running through the foundation wall would put far less pressure onto the pipe and joints itself. I understand when most installation/design work is completed is usually well after structural design, but when we do design upfront wouldn't this be the best-case scenario?

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3 Comments
DW
6/7/2019 10:35:54 am

Chapter 10 of NFPA 24 and Chapter 10 of NFPA 13 cover this topic pretty extensively. NFPA 24, Figure A.10.4.3.1 and the two figures that follow are helpful.

According to code, the 12 inch required distance from the footing to the top of the pipe is sufficient.

Coordinating the different trades to put the fire service main through the wall seems like a nightmare.

Reply
Clifford Schulze
6/7/2019 10:37:18 am

That would certainly depend on where the job is. In the North-East we need a five foot depth of bury to be below the frost line. That would be a deep footing.

Reply
Ivonn Ochoa link
6/7/2019 12:25:42 pm

The transition usually is Ductil Iron why?, because if the underground pipe is PVC this cannot be exposed and steel cannot be underground so, the transition is with ductil iron.

Like said DW Check NFPA 24 and Chapter 10 NFPA 13.

If you don't want to have pipe under the building floor, you can up the pipe before exterior wall, do a material transition then enter by the wall with steel pipe.

In some cases can be helpful for example if you have to much difference between interior floor level and exterior floor level and if you don't have freeze problems.



Reply



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