1998 ASME Sect 2 Part D Values
1998 ASME Sect 2 Part D Values
(OP)
I have a customer in Canada who has ordered a machine that will have a pressure vessel on it. A small vessel made of 304SS pipe with welded elliptical ends made to Sect 8 Div 1.
In their specs they require we use material values from the 1998 addition of Sect 2 Part D.
My understanding is the difference between the current values and the 1998 revolves around a change in the factor of safety to calculate the strength allowable. 1998 was 4 and the current addition is 3.5. My problem is I can't see where this comes from. For 304SS without the efficiency factory just dividing the ultimate strength by 3.5 does not give the allowable. I have to use 3.75 to make that work.
One of the older guys told me to just multiply the current allowable by 7/8 to get the 1998 values. Given all the hoops the code makes us jump thru this just seems to simple.
Is it that simple or do I need to track down a copy of the 1998 code to find the values.
In their specs they require we use material values from the 1998 addition of Sect 2 Part D.
My understanding is the difference between the current values and the 1998 revolves around a change in the factor of safety to calculate the strength allowable. 1998 was 4 and the current addition is 3.5. My problem is I can't see where this comes from. For 304SS without the efficiency factory just dividing the ultimate strength by 3.5 does not give the allowable. I have to use 3.75 to make that work.
One of the older guys told me to just multiply the current allowable by 7/8 to get the 1998 values. Given all the hoops the code makes us jump thru this just seems to simple.
Is it that simple or do I need to track down a copy of the 1998 code to find the values.





RE: 1998 ASME Sect 2 Part D Values
RE: 1998 ASME Sect 2 Part D Values
I am going back and forth right now on if it will be seamless or welded pipe based on size and cost.
RE: 1998 ASME Sect 2 Part D Values
400° 13.8 / 11 ksi
500° 12.9 / 10.4
600° 12.1 / 9.7 ksi
Smls / Weld
The Smls strength is NOT allowed to be used in Sect VIII Div. 1 calc's.