I once worked for AGM Glass Machinery, where we made glass tempering ovens. We used compressed air, a lot of it, to cool the glass. The compressed air piping was run through the poured concrete floor. As soon as I saw this, I told my superiors they would have problems -- that water would get into the piping and they would never be able to purge it.
The usual configuration for compressed air distribution is to run a main pipe vertically to the ceiling, and then horizontally throughout the plant with a small slope so that any water that condenses runs downhill and out. The supply drops actually run vertically off the top of the distribution loop, to keep water out of the drop. The supply drop takes two 90-degree turns and then runs down to the regulator take-off. The regulator branch is a horizontal T leg with the vertical pipe running down into a drip leg, so that any water that gets this far is kept out of the regulator leg.
The water separator was usually overwhelmed by the water flooding it during the air cooling segment of the tempering process. If the water made it to the cooling nozzles, there was the potential of breaking the glass by the extra cooling effect of the water compared to air. Over several days of tuning, the compressed air supply was still not purged of the water. So much for running compressed air through the floor.
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