Thank you @brimstoner
Actually, we do not have access to a failure analyst where the jobsite is. (Lebanon).
In all cases thank you, and if anyone else can think of anything, that would really be helful.
We are experiencing repetitive firetube leaks on two steam boilers serving a laundry.
(York-Shipley 100HP, 150 PSI design, burning Diesel Oil)
This has been dragging for some time, and we are sure that we have no issues in Water Treatment, no short-cycling, no batch loading, no thermal shocks...