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Posted by Randall Thorpe on January 26, 2002 at 11:26:23:
In Reply to: Re: cleaver brooks dimpled tubes posted by Steve on January 26, 2002 at 06:30:24:
: : Does anyone have any experience with tube failure occurance in dimpled tubes as opposed to round tubes?
: What kind of failures? The dimpled tubes are for there ohio specials. So you may get cracking on the rear tube sheet if the beads are not tight to the tube sheet. otherwise the same causes of normal tube failures will apply.
We've had seven tubes leak in one boiler since school started this year and none in the other three boilers. The welding contractor who replaced the tubes told me that some of the leaks occurred at a dimple about four inches or so from the front tube sheet. The only difference in the boilers is that the one in question sat idle for long periods of time this winter waiting on either contractors or our maintenance dept. to finish repairs to get it back online. They don't tell us how long it will be for repairs, so we don't know whether to leave them full or drain and lay them up dry. I'm wondering if prolonged idle periods affect dimpled tubes any differently than round ones. Yes, they are Ohio Specials. School boards replace boilers with them to get around licensing requirements and to be able to hook them up to building automation computers.