Low points in CPVC Blazemaster systems

[EricDesilets]

Hi,

I know low points in fire sprinkler systems need to have a way to evacuate the water that is trapped.

However, the only argument I found to justify this requirement is the corrosion that can be caused in that low point.

So, I'm wondering if the same requirement should apply with CPVC piping?

Since there's no corrosion expected in this piping, does an auxiliary drain is still mandatory?

Thanks for your help!

 

[UFT12]

General speaking and mainly for steel pipes per NFPA 13, drains are not only provided for mitigating corrosion and frankly I doubt that's the main reason of having them. You end up with air pockets in the system anyway. The riser of a system that starts at a higher elevation from the area it protects will need an auxiliary drain down the road. I guess the need is obvious. Where is the water of the lower part going to go without a drain connection when repairs or extensions are needed? One could say it could be done by removing a sprinkler or a coupling or two but is this the right way? For that reason is my understanding that NFPA 13 does not make any distinction between pipe types when it comes to auxiliary drain requirements.