Search results for query: *

Hi, Im new to FEA..im trying to do a stress linearization for a pressure vessel body using solidworks simulation. As you can see in the picture attached pic 1 shows the stress points and calculated membrane + bending stress between these two points. Which is around 50000 psi for von mises and...

Hi, A fluid pressure of 10000 psi is acting on the inner and outer wall of the cylinder. The cylinder is fixed at one end as shown and the other end experiences a compressive force of 95000 lbf. I just want to know whether, 1) three principal stresses ie., the longitudinal, tangential and...

Hi All, Hope somebody could clear my doubts. I'm looking to calculate the von mises equivalent stress (using distortion energy theory)and primary membrane stress intensity for a cylinder with internal and external pressure and with a compressive load on one sides as shown below. So, for...

Hi Dinu, Thanks for your replies. Do you have time to discuss on my thread above. Appreciate your help. Thanks Hanson

But thanks for your replies.. I have three more questions to discuss... 1) For the gate valves ..parallel slab gate..to find the gate deflections what method are u using? Although there wouldn't be much deflection on the gate, I'm using the deflection formula from Machinery Handbook (see...

Hi Dinu, Yes you are right. I was looking into the API 6X first edition instead of the Second. But still, in the second edition they called it as informative - an additional reference to the main content Section 5.3 Stress categories. But in the main section, they didn't say its...

Hi Dinu, I have one more clarification. As per the API 6X second edition. Section 4.4 Stress Categories, is it mandatory to calculate the primary + bending stress? and the secondary, peak stresses? The reason I ask is the section 4.4.1 says that the stress "The categories are based on the...

Hello , Has anybody faced Audit after the new Revision API 6A 21st Edition, Nov 2019 Please share your experience (especially on Gate Valves) Regards, Hanson

Hi All, I have a doubt in evaluating the stress by classical methods.. I could calculate the bolt load for operating condition and gasket seating condition and calculate the stress based on the reference below, ASME Boiler and Pressure Vessel Code, VIII, Division 2, Alternative Rules, ‘Rules...

Thank you very much I have one last question ... its regarding shear pin calculation for stem. It might be simple but i need some lead from somebody who has valve design experience. How to calculate the shear pin failure ... to justify the shear pin fails before stem during torsion. below is...

Hi, Please, can anybody explain what stress does the shear pin will see when the shaft is subjected to torsion? (See image attached) I calculated as below, Torsional Shear stress for a shaft (mild steel) = 0.75 x UTS of shaft Shear stress for the shear pin (double shear) = 2 x UTS of...

Hi Dinu, Thanks. How about this.... I tried the below as per API 6X Combined Stress. Which says stress intensity, Si = S1-S2 (S1>S2>S3) Therefore I calculated the three principal stresses as per Roarks formula as below, And found the difference between maximum and the next available minimum...

Thank you very much Guys it was really useful

Hi Jmec, Thank you very much for the details. Actually the question was to calculate for a valve body. For straight uniform cylinders, I'm using only the principal stress formula below to calculate this. Where LStress - Longitudinal stress, TStress - Tangential and RStress - Radial...

Hi Dinu, Thanks for your reply. It was useful. I want to use the distortion energy method, that is by combining the triaxial stress to obtain the equivalent stress. As in API 6A 21at edition the ASME method part has been removed and replaced by API 6X ie., earlier it was ASME Method to...

Is reinforcement calculation required for gate valves? What is the condition to do or not to do a valve body shell to outlet reinforcement calculation?

Hi, I am new to designing gate valves to API 6A 21st edition standard. In the process of performing design calculation, I have few questions for which I am looking for answers. 1) When defining the design allowable stresses for pressure vessel calculation or wall thickness sizing, I am using...