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Thank you Moein. Good information

Dear Moein Are there only three of good manufacturers there? I mean if a company wants to do a project by iranian manufacturers only these three companies are recommended? Do you know other good companies? Warm Regards

TGS4 What is meant by the meridional stress in the following: Does this mean the stress which is normal to the SCL and lies in the SCP? Is it necessary to consider multiple SCL around the stress concentration region or just one will do? Is there any guide regarding the orientation of the SCL...

TGS4 please help me understand an issue regarding SCL's as per VIII-2 Part 5. In one of your previous posts you mentioned something that I have doubt if I got the point or not. It is in thread794-412084 Does this mean that the only valid points to be accounted for membrane or bending stresses...

Thank you TGS4. This can be an answer to all questions here. I mean if I have the knowledge then why would I even ask any questions? We are all here to learn. Anyway I think by this sentence you mean this issue is far more complicated than I could even imagine but do not worry about it I am...

r6155, that number 100 does not guarantee that these formulas are based on percent. I know they are in percent because when I tried some pressure vessels with low thickness to ID ratios the formula showed me some 0.56 which is very high if multiplied by 100. It was better to indicate in the...

Thank you metengr. Is it OK to put an overlay on a vessel which is already gone through PWHT? I thought no welding is permitted after PWHT unless applying overlay is not considered a welding at all. Is it not better to choose the second method (i.e. bonded cladding with 347) because if any...

Dear All I was trying to understand the requirements for PostFabrication Heat Treatment of a pressure vessel. My problem is that I do not know the strains in Table UG-79-1 are in per cent or do I have to multiply it by 100 to obtain the per cent of the strain.

Thank you for your replies. metengr, do you think that if I use 347 or 321 as the cladding material there will be no problem with the PWHT?

Dear All I have a problem with the PWHT of a vessel when it comes to its overlay. I want to know the following in the above cautionary note from ASME. What grades of stainless steel are stabilized and which ones are unstabilized? What are the temperature ranges of carbide participation? Can I...

Dear All I was hoping to find some method according to ASME BPVC VIII-2 in order to find a way of evaluating some equipment for their fatigue strength in high temperatures. However, I failed in the first step by reading the article 5.1.1.3. What can I do in this situation? Warm Regards

So this is about the number of the specimens that are tested? how many tests has to be done and based on which standard or spec those tests are performed? Do they use extrapolation methods like Larson-Miller?

Dear All Can you please help me understand what the difference is between average and minimum stresses in cases 2 and 3 above?

TGS4, What is the motive for not including the bending effects of the through thickness stresses? I know this is the procedure as provided by the code but I do not know what the reason is. My guess is the following: For the through thickness shear stresses since they have a distribution like a...

If it is for marketing issue then it was better to choose Mona Lisa.

Dear All I wonder why in many engineering specs there is fireproofing on supports and not on the vessel walls. For examples it happens a lot that the skirt has a 50 mm concrete fireproof and there is no fireproof on the vessel wall at all. Any explanations? Warm Regards

Dear all Just out of curiosity, what is the relation between the da Vinci work and BPVC? Why did they choose that for the cover page?

MrPDes, I have never heard of regional primary stress. The code in Part.5 5.2.2.2 (b) introduces a procedure to separate Pl from Pm. Nevertheless, I agree that in some cases the state of stress is a mix of different categories. If design procedures in Part.4 put a limit on the Pl then it would...

NRP99, I did not say that the allowable stress for hydrotest being higher than the design condition is a problem. On the contrary I said since it is applied just once in the vessel life it can have higher allowable stresses. My question was if the allowables for hydrotest can be higher since it...

Thank you NRP99 for your reply. 1-Can you tell me how the hydrotest is different from the operating condition of equipment in terms of their allowable stresses? I mean why the hydrotest condition has higher allowable stresses in comparison with the design condition? Is it because the hydrotest...