Time dependant and time independent properties as per ASME
Time dependant and time independent properties as per ASME
(OP)
Could anyone explain these terms and their significance in ASME Boiler Section I construction?
Also, does ASME Section I requires a fatigue analysis?
At what conditions, a fatigue analysis is required?
Also, does ASME Section I requires a fatigue analysis?
At what conditions, a fatigue analysis is required?





RE: Time dependant and time independent properties as per ASME
Do not have ASME I so you will need to read ASME I and there will be a section regarding whether fatigue assessment is required or not or it may refer to ASME VIII Div 2 wherein there is a Screening procedure to determine if fatigue is necessary or not.
RE: Time dependant and time independent properties as per ASME
RE: Time dependant and time independent properties as per ASME
RE: Time dependant and time independent properties as per ASME
If the new boiler is for electrical power generation, I would assume frequent starts and stops to adjust for demand and variable generation (think wind and solar) on the order of once per day. If the boiler is for some other continuous service, it may not be an issue
RE: Time dependant and time independent properties as per ASME
RE: Time dependant and time independent properties as per ASME
RE: Time dependant and time independent properties as per ASME
But, you see, once those very reasonable and practical "operational" requirements are sewn up inside the design, you find that the boiler HAS TO startup immediately from a below-freezing 20 degree F day, or that the controlled heatup suddenly got aborted due a motor failure or controller error or site blackout or regional storm or fire damage ... Or the "controlled" cooldown that was required suddenly became a uncontrolled abort because of a burst pipe or dust explosion or cooling water interuption or lube oil fire.
You need to plan for a gradual failure or a series of failures because they will happen sooner or later. Allow for some unexpected event. (The events you do plan for will, of course, not happen. )