dry pendent on anti-freeze system ??

[SPKR]

The owners mechanical engineer made a comment on my drawings that I needed dry pendents on my antifreeze system in lieu of standard pendents.
This is a small antifreeze system above a ventilated metal ceiling covering a loading dock.
The pendents are on return bends for adjustment purposes.

Before I explain to him how the antifreeze will protect the drop and sprinkler,(Just like it is protecting the rest of the piping above the ceiling) and utilizing a dry pendent won't make a difference, I wanted to make sure there isn't something I am missing here.

Thanks

 

[TravisMack]

Only the increased costs of the dry pendent and the increased frequency of testing the dry pendent. I think it is 10 yrs vs 50 yrs with standard sprinklers.

Travis Mack
MFP Design, LLC

 

[ryano669]

He could be concerned that the drops will not be individually drained when the solution is replaced periodically. If it is small like you implied, I wouldn't think a few drops should matter.