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Safety factor changes in ASME VIII Div 2?

Safety factor changes in ASME VIII Div 2?

Safety factor changes in ASME VIII Div 2?

(OP)
Since 1965, have there every been changes to the allowable stress safety factors in ASME VIII Div 2?  The reason why I ask is that I am trying to apply API 579 Section 3 to develop a Temperature/Pressure envelope for start-up/shutdown of a reactor.  According to API 579, if my vessel was made to Div 2, Temperature restrictions must be observed when I surpass the 30% MAWP value (8 ksi level).  However, old (pre API 579) original documentation stated that the limit was closer to 25% MAWP but did not explain why.   

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