Maybe the steel pipe is at the high point of the system and buried, then, maybe
it would be worth it.
If you’re trying to solve the corrosion problem, then there’s better ways to
accomplish that. Figure the cost of the air vent, the additional maintenance
costs for the lifetime of
Matt,
I feel it's worth mentioning that on two floors of the building, the
only metallic pipe is ± 25' of Schedule 10, and then in transitions to
CPVC.
When I expressed the need for venting on those floors, the response was
similar to "Nobody else makes us do that!"
I still believe that a
thank you for your input
it’s just odd, that 4 risers, 2 work perfectly. 2 have a delay on the first
test, then work perfectly after that.
_
SprinklerForum mailing list:
This could be several things. Bruce already mentioned one.
My next guess is that your backflow spring pressure is being overcome at
seemingly random times (this is the backflow differential pressure). The
pressure in the system has to drop some (drain off the system side) before
any water
To answer your question Todd,
The SYSTEM is required to be vented each time the system is drained and
refilled.
The check valve or physics do not come into play.
The 2-story example you provided is only one System. Therefore, if drained,
then refilled, it would be the entirety of the System.
