Section II, Part D Theramal expansion values
Section II, Part D Theramal expansion values
(OP)
Thermal expansion coefficient for 90Cu-10Ni in section II Part D, Table TE-3 has a value of 9.5 at 550 F. The table doesn't show values at other temperatures and neither does TEMA. How do we evaluate differential expansion of tubes at different temperatures other than 550 F? Any help is appreciated.





RE: Section II, Part D Theramal expansion values
RE: Section II, Part D Theramal expansion values
RE: Section II, Part D Theramal expansion values
Regards,
Mike
RE: Section II, Part D Theramal expansion values
Be advised, even if you are confident that the HX does not indeed require an expansion joint, improper start-up, shut-down, or operating practices can cause failures at the tube-tubesheet joint on a well-designed, well-fabricated unit.
Have you confirmed that the HX has failed at the tube-tubesheet joint, and not in the tube(s) themselves?
-TJ Orlowski
RE: Section II, Part D Theramal expansion values
The definition of the coefficient B in the 'General Notes' below the Table TE-3 appears to me quite comprehensive, that is 9.5 applied between 70F and 550F. The tube material is anyway limited to 600F application. Is it the 50F difference between 550F of Table TE-3 and 600F on Table 1B that bothers you? It is indeed a bit of inconsistency of the code, but I'm sure you can use the same figure up to 600F and the IA won't complain.
RE: Section II, Part D Theramal expansion values
No,I have not looked for the industry publised values yet.
Yeah,according to the definition 9.5 can be applied from 70F to 550F but I was not quite sure if that was correct.