Length of tube expansion on Tubesheet
Length of tube expansion on Tubesheet
(OP)
We are fabricating a steam generator for WHB.In client spec for tube expansion, they specified to expand 1/8inch beyond the tubesheet thickness (to the backside of the tubesheet). The tubes are to be strength welded and expanded to 3-8%. We used to expand as per TEMA i.e.tubesheet thickness minus 1/8in. Is this advisable to expand beyond the tubesheet thickness? I fear it may cause bulging of tubes.





RE: Length of tube expansion on Tubesheet
Regards,
Mike
RE: Length of tube expansion on Tubesheet
RE: Length of tube expansion on Tubesheet
RE: Length of tube expansion on Tubesheet
RE: Length of tube expansion on Tubesheet
RE: Length of tube expansion on Tubesheet
RE: Length of tube expansion on Tubesheet
RE: Length of tube expansion on Tubesheet
RE: Length of tube expansion on Tubesheet
So, vesselrajj, if you have confirmed this is what the client is after, you must take care that the tube is not cut by the expansion process. The tubehole will have to be square edged to eliminate the crevice, but this aggravates the cutting issue. Better would be a small radius on the tubehole, but this could possibly leave a small crevice still. I would get complete buy-in from the customer on your proposed details & process before proceeding.
Regards,
Mike
RE: Length of tube expansion on Tubesheet
RE: Length of tube expansion on Tubesheet
Cheers,
gr2vessels