Governing Temperature (UCS-66 ASME SecVIII Div 1)
Governing Temperature (UCS-66 ASME SecVIII Div 1)
(OP)
Refer case as below for pressure vessel (design code is Sec VIII Div I - Section UCS-66):
- Required thickness of vessel - 9.5 mm
- Vendor offered A106 GrB SCH80 for shell so nominal thickness is 10.97mm
-Minimum Design Temperature - minus 29degC (-20degF)
As per the curve, A106 should fall in curve B and hence the max. thickness up to which impact testing is not required is 10mm(0.394inch).
Do we need impact tested material since the required thickness is less and the actual and nominal thickness would be more than the allowable non-impact tested material thickness of 10mm.
Which thickness should be the used for governing thciknes? Required Thickness, Nominal Thickness, Actual Thickness?
Nickypaliwal
Materials & Corrosion Engineer
- Required thickness of vessel - 9.5 mm
- Vendor offered A106 GrB SCH80 for shell so nominal thickness is 10.97mm
-Minimum Design Temperature - minus 29degC (-20degF)
As per the curve, A106 should fall in curve B and hence the max. thickness up to which impact testing is not required is 10mm(0.394inch).
Do we need impact tested material since the required thickness is less and the actual and nominal thickness would be more than the allowable non-impact tested material thickness of 10mm.
Which thickness should be the used for governing thciknes? Required Thickness, Nominal Thickness, Actual Thickness?
Nickypaliwal
Materials & Corrosion Engineer





RE: Governing Temperature (UCS-66 ASME SecVIII Div 1)
RE: Governing Temperature (UCS-66 ASME SecVIII Div 1)
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: Governing Temperature (UCS-66 ASME SecVIII Div 1)
RE: Governing Temperature (UCS-66 ASME SecVIII Div 1)
Can you also confirm as which thickness do we generally look at while deciding for impact test?
Although I have gone through the UCS66 and Fig UCS66.3 earlier also but am not clear as which thickness are they referring to?
Is governing thickness based on the
-Required Thickness,
-Nominal Thickness or
-Actual Thickness?
Nickypaliwal
Materials & Corrosion Engineer
RE: Governing Temperature (UCS-66 ASME SecVIII Div 1)
RE: Governing Temperature (UCS-66 ASME SecVIII Div 1)
RE: Governing Temperature (UCS-66 ASME SecVIII Div 1)
you can find the exact definition of governing thickness on ucs-66 (a) 1&2. although by role of thumb it could be nominal thickness.
RE: Governing Temperature (UCS-66 ASME SecVIII Div 1)
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand