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...
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.
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
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,
I have some questions regarding allowable stresses as per ASME BPVC VIII-2 when it comes to saddles stresses.
According to 4.15.3.5, the circumferential compressive membrane plus bending stress is denoted by σ7. The allowable stress for this stress is mentioned in 4.15.3.5 (f) to be...
Dear All,
Please help me understand some points regarding Impact testing required energy as per ASME BPVC.
First question is what is meant by minimum specified yield strength in Figure UG-84.1? Is it the value specified by the code in II-D or is it the value obtained from mechanical test...
Dear All
They are telling me (in the workshop) that if they cut the plate length based on the mean radius, there will be some extra length after rolling. Is there a formula or a reference to estimate that?
I want to know how to calculate exact length of a plate before rolling to a specified...
Dear All,
I have some doubts regarding the scope of work in VIII-1. The introduction part of the code says that some classes vessels are not included in the scope of Division 1. Among those excluded is the following:
What is the logic behind this exclusion? To my eyes this class of vessel is...
Dear All
Can anybody help me understand the occasions that primary bending stresses occur?
I tried table 5.6 in ASME BPVC VIII-2 but it seemed a little paradoxical in some ways. Try the highlighted cases in the image.
Dear All,
I am trying to understand the difference between two situations. Please help me understand this.
In ASME BPVC VIII-2, the definition of ratcheting is as follows:
In the definition provided by the code a sustained load is superimposed by a cyclic displacement controlled load . What...
Dear All
I have a basic question regarding design as per ASME BPVC VIII.
I want to know that if VIII-2 allows higher allowable values for stresses in design then why don't we just fabricate all pressure equipment as per Div-2 and forget about Div-1?
Suppose that I am in the position of a...
Dear all
I am using Ansys workbench 16.1.
does anybody have any idea how to remove the following error:
the mesh of the following entities have no volume elements
what is the cause of this error and what should be done to remove the issue?
Warm Regards
Dear All
As per ASME BPVC Sec. VIII-2 Par. 5.5.6 in order to perform ratcheting analysis using an elastic method, it is necessary to calculate primary plus secondary stress range and peak stresses must be excluded in the process. When the FEA results of a linear elastic model are available, the...
Dear All
I am trying to understand the calculations for base ring in Pressure Vessel Design Manual by D. R. Moss (Ed. 4).
in chapter 10 procedure 10-5 the base ring is checked so that there will be no failure during lifting of the equipment. But the calculations basis cannot be understood at...
Dear all,
Occasionally I am asked to perform calculations for equipment as per ASME Sec.VIII Div-1 and they want me to perform calculations using U-2 (g). Till now I automatically went to some other codes or Div.2 DBR or DBA and followed the instructions provided by these codes. I just started...
Dear all
Based on ASME Sec.VIII Div-2,I have performed calculations for exemption of a vessel from detail fatigue calculations. In my calculations Method A screening criterion could not exempt the vessel however, by applying method B the vessel was exempted from fatigue calculations.
I sent the...
Dear All
Recently I was working on fatigue calculations for a vessel as per ASME BPVC Sec.VIII-2. I wanted to exempt the vessel from detailed fatigue calculations as per fatigue screening methods but exemption of the vessel was not possible with any of the methods.
Then the owner has asked to...
