General Creep Question
General Creep Question
(OP)
Hey Everyone:
Had a general question regarding Creep concerns. If I have a SA-516 Gr. 70 vessel with a allowable temperature of 650 deg. F that runs for 45 hours at 800 deg. F:
1) IF the vessel will no longer see temperatures above 650 deg F, is there any concern for creep failure?
2) Does API 579 discuss any analysis methods to determine if running that hot for that time will be detrimental to the long term life of the vessel?
Thanks!
Had a general question regarding Creep concerns. If I have a SA-516 Gr. 70 vessel with a allowable temperature of 650 deg. F that runs for 45 hours at 800 deg. F:
1) IF the vessel will no longer see temperatures above 650 deg F, is there any concern for creep failure?
2) Does API 579 discuss any analysis methods to determine if running that hot for that time will be detrimental to the long term life of the vessel?
Thanks!





RE: General Creep Question
RE: General Creep Question
RE: General Creep Question
I know these are broad strokes, just trying to understand some of the general concerns with creep range operation. Thanks!
RE: General Creep Question
If anything, I would perform an inspection during the next outage and look for any local deformation and obtain wall thickness readings and hardness. This would be more valuable to me than any calculation.
RE: General Creep Question
Otherwise you should be OK. But an assessment is needed.
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P.E. Metallurgy, Plymouth Tube