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maraamaram
Active Contributor

Join Date: Nov 2009
Location: Sharjah, UAE
Posts: 22

Thermal Cycles in a Plant

06/22/2010 6:18 AM

Dear all,
In stress analysis, the no. of thermal load cycles are generally considered 7000 (so that the corresponding f=1). This is true for a plant life of 20Years.
My question is, If the plant design life is 30years, do we have to consider higher thermal cycles ?

Anybody of you have considered thermal cycles higher than 7000 ?

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Ried
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Join Date: Dec 2005
Posts: 1602
Good Answers: 19
#1

Re: Thermal Cycles in a Plant

06/23/2010 9:13 AM

I do not design thermal plants, but it seems intuitive that YES you would design for more than 7000 cycles, maybe on the order of 8000 to 10,000 thermal cycles for a 30 yr plant design. The alternative is a major plant overhaul at the 15-20 year mark, which seems to defeat the purpose of designing for 30 years.

Since I have little experience in this field (college course work more than 35 years ago) I am not sure I have any other comments.

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maraamaram
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Join Date: Nov 2009
Location: Sharjah, UAE
Posts: 22
#2
In reply to #1

Re: Thermal Cycles in a Plant

07/18/2010 4:04 AM

Thank you very much

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