INTERMEDIATE HEMISPHERICAL HEAD

[llaren]

Good day to you all.
I am a new engineer in pressure vessel designing.I working in pressure vessel in human occupancy design company.I would greatly appreciate if anybody help me to get right way. Normally I read design according to 2007 ASME boiler & pressure Vessel code. But for me that code is a bit difficult and complicate to find out the wanted point.
I would like to design intermediate hemispherical head design as customer request.I tried to find out in ASME code.But code not recommend about that int. hemispherical head. Fortunately I found in Dennis Moss Pressure Vessel Design Manual) about that int. head. Joint Efficiency is 0.7. So, That Int. head is not according to ASME code? My design is according to ASME code and I would like to know reinforce plate in that joint.How should be that thickness (A,B,C? in sketch).I show detail sketch in attach file.Does anybody have that Int. head Calculation (PV Elite)? I looking forward anybody reply and I would greatly appreciate for that.Thank In advance.

 

[racookpe1978]

Please get some professional help: You are not, in my opinion, ready to design or detail man-rated pressure vessels. Nor is your supervisor capable of checking or approving such a design if he has given you such little effective guidance and training.

Will you and your supervisor and your employer be the first, second, and third to take it to design pressure and operations at design depth?

 

[llaren]

i just try to look up and study,,thank

 

[SnTMan]

llaren, first, while not correct for your class of work I will be citing Sec VIII Div 1, since you seem to have a copy. By the way the 2010 Edition is the current one. Pressure Vessels For Human Occupancy is governed by ASME Standard PVHO. I recommend you get a copy.

Your head design thickness will be per UG-32 and UG-33, the thicker of, for a hemi head. Design pressure will be 7.5 bar in either case, unless you can justify a differential pressure.

You may want to increase its thickness to provide reinforcement for the manway opening.

Your weld detail may be considered as an angle joint, in which case it is governed by U2(g), that is, design rules are not given in Sec VIII, Div 1.

If it can be considered a corner joint, joint efficiency may be taken as 1.0. See Table UW-12. Please note that in general, joint efficiencies per this table only apply to butt-joints.

Again I say that Sec VIII Div 1 rules may not apply. Get the proper standard.

Regards,

Mike

 

[unclesyd]

I concur completely withe above post by racookpe1978 concerning the design of a PVHO.

Here is what you need to start understanding the design of a PVHO.

Here is what the National Board says along with the ASME Code that covers same.

http://www.nationalboard.org/PrintPage.aspx?pageID=202

http://www.asme.org/products/codes---standards/safety-standard-for-pressure-vessels-for-human-occ

Here is a more detailed design guide.

http://www.wbdg.org/ccb/DOD/UFC/ufc_4_159_01n.pdf

 

[llaren]

thank so much.

 

[kwaliteitshenk]

PVHO last line of 1-5 says that a Registered Professional Engineer has to certify the Manufacturers Data Report for a PVHO.
Is that the U-1A form from Section VIII-1 which is to be completed after hydrotesting etc.? Or is the complete design (drawing, calculations and material specifications) before fabricating the vessel.
What is the equivelant in Europe for a Registrated Professional Engineer?
Thanks