Quote:
Originally Posted by uncleof6
................Durso standpipes, are never quite quiet, never quite reliable, never quite stable. They are designed for low flow systems, where the flow rate is such that these problems do not occur.
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Wow, overall I don't think you could be more wrong if you tried.
As quiet as a full siphon? No, but a durso can be relatively quiet.
Reliable? As reliable as it gets. That's the beauty of not running a full siphon - it can flow far more than when it's running correctly (i.e. it will siphon -> break -> siphon). Unless there's huge obstruction in the line it will not fail. They have been in use for far longer than either of the full siphon methods..............number of fails other than a clog? Never heard of one.
A 1" durso will flow about 600gph, not 350 for 1.25". Far less than a full siphon but far more than you state.
OP - the best way to get a Durso quiet is to drill holes in the cap/top of the pipe - the part above the T. Drill 4 holes through both the cap & the pipe. Now you can turn the cap to adjust the airflow. Turn down the airflow until you get the siphon/flush -> open it up a tad, it will be as quiet as it will get. When you hear the air sucking sound you have it too far open.