As far as my experience, Service duty/life(like 100,000hrs) is given only to dynamic loaded machine element. Rupture ey? Is this some sort of tank you are designing? Is this tank close & subjected to variable pressure?
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This is used as one of the selection parameters for allowable design pressure as per Lloyds Classification of ships (For the design of pressure vessels). The other parameters are 0.2% yield stress and tensile stress at room temperature. Based on the 3 values, the lowest values is taken as max. allowable stress.
This type of requirement is valid for reformer or cracker tubes which are designed for 100000 service hours. But these tubes's material is generally special alloys developed by these tube manufacturers. e.g. M/s Schemidts & Cleman, Paralloy, Manouer etc. they have developed alloys which are good in creep strength at elevated temperature and tubes manufactured by them is suitable for 100000 hours at temperature range of approx. 1000°C or so.
But i am not yet a "boiler man" instead im only a boiler boy i need lots of experience to become a boiler man! I am a new comer with less than a year in this field.
Could you mind to post which Div. of Section VIII contains the average stress to rupture values for ASME materials, as i have already searched a bit in Sec I and Sec VIII ?
Creep Rupture Values
Re: Creep Rupture Values
