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Hi, I am using X19CrMoNbVN11-1 material in some of the pressure boundary bolts. The operating temperature is 560 deg C. This is very good creep resistant material. But for the stress levels that bolt is having the calculated creep rupture is at 40000 hours. How do I interpret this results. I...

Thank you XL83NL, The additional test reports PMA requires for high temperature is tensile strength at the design temperature or higher and impact strength at the minimum ambient temperature. For X19 (X19CrMoNbVN11-1) material dual certificate is not applicable because it is non-ASTM and...

Hi, I am designing a high temperature steam shut off valve. The design pressure is 160 barG and temperature is 570 deg C. The design code is ASME Section Viii division 1. The body and bonnet material is A217-C12A. This is for an European customer and PED category required is IV. I have PMA for...

XL83NL, Please see attached extracted page of B16.34 where A182-F92 also specified. It also has other materials that you have mentioned.http://files.engineering.com/getfile.aspx?folder=2b3f9743-8749-4fa7-a0df-b82a66525e46&file=Group_1.18_of_B16.34.pdf

Thank you XL83NL, What are the limitations of using code case allowable stress values? The code states 'Users are cautioned that not all jurisdictions or owners automatically accept Code Cases'. Also the mandatory appendix 43 of the section Viii, division 1 states 'Code Cases that have been...

Hello All, I'm designing a control valve body for a temperature of 610 deg C and steam service. I wanted to design the valve body and bonnet as per ASME section Viii, division 1. But I could not find the allowable stress values for this material for this material from ASME Section II-D. I am...

Hello LittleInch, Please see attached file (this is the top view). Here the round inlet merges into the valve gallery. I want to merge the inlet smoothly into the gallery to minimize the flow losses. This merging is resulting in the oval cross section. I want calculate the wall thickness...

Hi, I'm designing a valve as per ASME Sec VIII div -1. To maximize the capacity I'm trying to make the inlet into Oval shape. But I'm not sure how to calculate the Hoop stress for a given internal pressure. Please see attached oval example. Thank you in advance.