Lets not lose sight that the question was about extending above ground system 
piping below ground for a dry pipe system and CLDI was suggested.  That nixes 
the miles of pipe that is HDPE or PVC having any bearing.  I’ve seen 
delamination in wet pipe but even if it’s a small percentage,  the potential is 
greater in a dry-pipe water flow event so it merits consideration.  The bottom 
line is that such installations occur but there’s no real guidance.

Roland Huggins, PE - Senior VP Engineering
American Fire Sprinkler Assn.    
Dallas, TX
http://www.firesprinkler.org <http://www.firesprinkler.org/>

Fire Sprinklers Saves Lives

> On Feb 19, 2018, at 11:53 AM, Prahl, Craig/GVL <craig.pr...@ch2m.com> wrote:
> So if it isn't CLDI it's HDPE or PVC.
> So I guess I'm confused on why there is concern for this technology.

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