Good day,

I would like to have an explanation about how Caesar2 consider number of cylces in a plant. In my understanding this depend on what ASME code we are considering and allowable stress range depends on number of cycles? If we choose ASMEB31.3 as our code, Is Caesar2 will automatically decide on how many cycles to be consider? Please guide me.


Regards,
Machoguy

No CAESAR II will not set the number of cycles, the software has no way of knowing what this should be.

I presume you're asking so that the "cyclic reduction factor (f)" can be set? On the Allowable Stress dialog you have fields for (f), which you would obtain from your Code based on the number of cycles. Recently B31.1 and B31.3 removed the table and have provided an equation to compute (f) based on the number of cycles. So on the Allowable Stress dialog you can input (f) directly, or for those Codes, you can input the number of cycles and CAESAR II will compute (f). Either way you have to know the number of cycles.

Good day,

Sir Richard, I understand what you mean. I did not put any value here from the start until now. If this field remain empty, meaning the caesar2 will
consider stress range reduction factor of 1.0? I read in the book of Practical Guide to ASMEB31.3, it was stated that if your plant designed to ASMEB31.1, probably the life of the plant is about 40years. So therefore, do we must input the correct value of stress range reduction factor?


Regards,
Machoguy

Machoguy,

The stress range reduction factors for f= 1.0 start at 7,000 cycles and then B3.1 Power piping code has f factors for up to 100,000 cycles while B31.3 Process piping code has f factors for up to 2 million cycles. The basic 7,000 cycles applies for one cycle per day to result in a 20 year plant life. Most power plants run for months between startup-shutdown, so life of typical power plant is much longer. If your plant cycle is less than daily, or it has expected life less than 20 years, then you could leave the stress reduction field blank for fewer than 7,000 cycles.

You must establish the value for the number of cycles and the plant design life. CAESARII doesn't set the plant operations cycling or life expected.