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Thanks a lot. I have recieved similar replies on LinkedIn. All replies states that for the membrane stresses, code allowabls are ok. Intension to the secondary stresses shall be given. Regards, M.Salaheldin Static Equipment Mechanical Design Engineer

I'm designing now a heating coil of SA-333 6 material that works at 375°C. By checking ASME BPVC II-D(M); Table A1 Note T-1, Allowable stresses for temperatures of 370°C and above are values obtained from time–dependent properties. The coil will work under this conditions for 24 hours every...

Thanks @r6155 for your cooperation. The procedure in Dennis Moss is simplified and doesn't have reference/base. Dennis Moss book is very great, no doubt. But, when we have references or derivation of the used equations, it becomes better. COMPRESS & PVElite use Roark's formulas but they provide...

dhengr, Ok, thanks. You are absolutely correct. Since Roark's formula is the reference that many PV software packages like COMPRESS & PVElite are using for such calculation, I have assumed that many engineers have already verified this ans subsequently had the book to do so. What you have said...

Nice question that I don't have a reply for :) However, I do believe that U-2 (g) will be applicable in this case. There are also other questions related to sketches like (m). What should be the shell thickness? Is the minimum thickness under the retaining ring? I think no. It should be the...

UG-19 is for combination of units. i.e. means when you multi-chamber vessel. i.e. vessel with different sections that is subjected to different operating conditions. If the operating conditions of one vessel is affected by the operating conditions of the other vessel. Then this is dependent...

Thanks for the reply. Unfortunately all those rigging books care only about the lifting equipment and accessories. The safety of the vessel during lifting is the responsibility of the vessel design engineer. Regards, M.Salaheldin Static Equipment Mechanical Design Engineer

[sad] No reply! Hope some one to help [bigsmile] Regards, M.Salaheldin Static Equipment Mechanical Design Engineer

We need to understand that Rolling is a plastic deformation we are applying to the material. This means that the material started to be work hardened. i.e the hardness will increase and the yield strength will as well increase. Again flattening will harden it more, and the second rolling is...

What do you mean by re-rolling? Do you mean the plate is rolled, then flatten, then rolled again?, or you mean that the plate is rolled to a diameter, and then due to some some reasons the rolled shell is resent back to the roller for rectifying the rolling, or to roll it to smaller diameter...

Of course. This is ID 1000 mm internal head profile that I use to make any diameter of head by scaling the geometry, and offset the thickness and SF. https://www.dropbox.com/s/0to5vjb6vmn95pa/Ellip%20Head.zip?dl=0 Please check as well. Your feedback is most welcome. Regards, M.Salaheldin...

@r6155 but this is not code requirement. I believe that the original question is mainly for the code requirement. If we include the service requirements, then many other points will start to take place. For example the dissimilar weld on surfaces exposed to Wet Sour will be a restriction...

Some of ASTM materials can be even used as pressure parts. Please refer to MANDATORY APPENDIX II especially Table II-200-1 (Eddition 2013 and newer. Earlier it was in introduction). In additon to provisions in david339933 reply, the external attachment that will affect the structural integrity...

Good question and Great reply. The requirement of involvement of PE is very restrected requirement. Part 4 is just an alternative formulas and the vessel is still div.1 coded vessel. For Example, App 1.10 uses already forumals of the same concept of Div.2 and the design engineer can use it in...

Code approximation of crown 0.9D & knuckle 0.17D doesn't result exactly in 1/4D depth of the head which is basic dimension as the name of the head is 2:1. The reason for this is that the 0.17 has some other digits. So, I'm using SolidWorks to draw the head. I set the crown dimension and the...

It is agreed that Roark's formula (7th edition) Table 9.2 Ref. No. 1 is not applicable for base block check in case of single tailing lug. Ref. No. 20 is the one that is commonly used by design software packages. But, in case of 2 tailing lugs, what should be the case? Ref. No. 4 is used by...

Thanks for your concern. I will reply to all questions. I have noted that most of your concerns are related to the thermal and process design. But, I'm working in a manufacturing company. We don't perform the sizing calculations, the process design or material selection. This is the EPC...

Thanks for the advise. I have utilized your suggestion. But, I didn't bolt it at the end. I have just rest it at 2 supports. one near to center and the other close to exit. Regards, M.Salaheldin Static Equipment Mechanical Design Engineer

Thanks for the reply. The final concept has not been yet finalized. Still waiting for the valuable inputs. The concept of cantilever is suggested for the easy removal and insertion, and to count for the improper handling during maintenance. However, the option of the sliding support is also one...

I have a heating coil of 3 m length. It is mainly 2 pipes but bended into 8 flows with only 4 ends welded to the cover of the heating coil insertion nozzle. In order to provide the necessary moment of inertia and to enhance the rigidity of the bundle, I have utilized a longitudinal stiffener...