Geting stress value at temp using b31.3

[AliGrailly]

Hi All Engs

I try to get stress value of material A105 from table A1 Code B31.3 at temp 68 celcius but cannot find .... just it showed me stress value if 100 & 200 Farenheit ... Could you help ne plz to achieve it correctly?

Thanks

 

[weldstan]

Are they not the same for both temps? If so they would be the same at a temp in between.

 

[david339933]

Not the same for B31.3.
Google Interpolation.

 

[weldstan]

Straight line interpolation was permitted in the past by B31.3. I assume it still is but I haven't access to current editions since 2015.

 

[AliGrailly]

1-Why there are different allowable stress of A105 material in b31.3 & viii div1 ?
2-how to get stress value at 68 centigerad degree for this material?
3-how to calc pressure rating of A105 at room temperature ( B16.5 mentioned it ) for class 150# ? Is there any formula ?

 

[mk3223]

The different Code Committees may define the different values of the allowable stresses (Sa) based on material in the specific applications, such as Process piping per B31.3, pressure vessel per ASME Code, or Boiler piping per 31.1, etc. So, the same type material could have a higher or lower Sa to be applied in the design per different Code application.

 

[AliGrailly]

Below links Calc stress in tension at temp 770 equal to 12120 but i cannot find in table A1 Asme b31.3

https://makepipingeasy.com/pressure-temperature-rating-table-for-piping-system/

 

[EdStainless]

And read the Code rules, there used to be cases where you were not allowed to interpolate, you had to use the value listed for the next highest temperature.

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P.E. Metallurgy, consulting work welcomed