In a new CFBC boiler we are facing economiser tube failure frequently. the failure type is, it looks like tube has got dent on the external surface and failing at that point. we have observed for the following reasons,
1) Failure due to corrosion No
2) Failure due to metallurgical issues of the tube - No
3) Erosion due to flue gas ruled out as each time only one tube is getting effected.
4) OEMs are also involved but no positive result.
Can any body suggest what may be the cause of dent formation and in turn tube failure.
One doubt is the dent may be caused during erection. Cannot be concluded as failure frequency is very high and boiler is one year old.
1) Failure due to corrosion No
2) Failure due to metallurgical issues of the tube - No
3) Erosion due to flue gas ruled out as each time only one tube is getting effected.
4) OEMs are also involved but no positive result.
Can any body suggest what may be the cause of dent formation and in turn tube failure.
One doubt is the dent may be caused during erection. Cannot be concluded as failure frequency is very high and boiler is one year old.