Overpressured during Hydrotest of boiler
Overpressured during Hydrotest of boiler
(OP)
After 1 nos of boiler superheater tube replacement, we conducted hydrotest. the test pressure is 1.5 x MAWP= 71 Bar. But due to mistake in chart recorder, we overpressured it till 122 bar.
We depressured it and performed visual inspection to see if the overpressure caused any deformation. But there was non found. So we redo the hydrotest with correct test pressure of 71 bar, and we found that 1nos of tube (different from the 1 we replaced) is leaking at the superheater header to tube weldment.
My question is, could the tube leak due to the overpressure or the tube is already defect before that. Is there a way to know what caused the tube leak. The original tube we replaced also because of the defect in the weldment.
All the other tubes are fine with no trace of leak at 71bar.
Thank you
We depressured it and performed visual inspection to see if the overpressure caused any deformation. But there was non found. So we redo the hydrotest with correct test pressure of 71 bar, and we found that 1nos of tube (different from the 1 we replaced) is leaking at the superheater header to tube weldment.
My question is, could the tube leak due to the overpressure or the tube is already defect before that. Is there a way to know what caused the tube leak. The original tube we replaced also because of the defect in the weldment.
All the other tubes are fine with no trace of leak at 71bar.
Thank you





RE: Overpressured during Hydrotest of boiler
"Whom the gods would destroy, they first make mad "
RE: Overpressured during Hydrotest of boiler
But I am surprised there was no noticeable deformation or stretching or ballooning of components, particularly those with the larger diameters. Do your inspection again looking not at the small diameter tubes, but the large diameter headers and pipes.
RE: Overpressured during Hydrotest of boiler
RE: Overpressured during Hydrotest of boiler