arbor,
You CANNOT "experimentally" rate a manway for a design pressure in the way you have described above.
It is obvious, that in the "vicinity" of the rated pressure i.e. flange MAWP, leakage through the flange will first generallly commence before actual destruction of the flange itself...
arbor,
I am unsure as to the purpose of your test aka manway pressure rating. If you are using ASME B16.5 standard flanges, then the pressure ratings will govern and no additional calculations are required.
All I can say is that when one does a convention hydrotest of a pressure vessel it is...
Fizzy,
For vertical vessels hydrotested if tested in VERTICAL position position at shop (based on the design pressure; to simplify matters).
Pressure at top (i.e. highest point)=(1.3 X Design presure X Stress ratio) .... (1)
....and.....
Pressure at bottom (i.e. lowest point)=(1.3 X Design...
Pressure thrust in case of the manway implies the internal pressure of the vessel oonm the blind flange which in turn will stress the nozzle neck.
Please also review PVElite's newsletter on this subject which is informative...
hahoo,
You need to post this on the dedicated COMPRESS forum http://www.eng-tips.com/threadminder.cfm?pid=1259 instead of this one to get responses.
-jehan
ChriChri81,
You need to compute the hydrotest pressure and check the vessel based on 10 bar.
Another way to view this situation is to consider the 10 bar pressure as the "primary" design condition with the alternate design condition set at 5 barg. Now would'nt you without a tinge of...
gr2vessels
From your reply dated 20 May 08 21:48 hrs, do i know you? pl reply.
Roca- if the other folks impy "shell side" as the face of the tubesheet where the tubes start/end (thereby meaning the face of the tubesheet wetted by the channel side fluid)then you are correct to say that I did...
gr2vessels:
It was indeed an eye opener to me to know of cladding being on the SHELL side and grooves closer to shell side face of tubesheet as I have not come across such a detail. i would appreciate if you could post the sketch of such a type of tube to tubesheet joint
regards,
jehan
I also understand that the TEMA 9th Edition just out right now [http://www.tema.org/highlig8.html], has some infornmation in the form of a table regarding equivalent materials. this might help.
reg,
Jehan
The maximum allowable longitudinal compressive stress is the B value as outlined in ASME UG-23.
In combined loading conditions, the maximum allowable longitudinal compressive stress is considered to be 1.2B as oulined in ASME UG-23.
PV ELite would also be using the same considering the...
gr2vessels,
In my experience as a pressure vessel engineer I have never come cross any tube to tubesheet joint detail or a standard where the annular grooves are closer to the shell face of the tubesheet. you are however correct to state that many standards and codes do not comment on this...
The grooves are always on machined within the tubesheet face which is closer on the channel face and NOT the shell face of the tubesheet. Details of these grooves are typically given in company/ client standards.
U may need to post this question in the boiler and pressure vessel forum and not...
for such a small dia vessel manway will not be practical. provived main/girth flanged joints in the vessel. In fact many client specification explicitly state that vessels with ID less than 900 mm should have main/ flanged flanges.
-jehan
