Length/Diameter (L/D) Ratio
Length/Diameter (L/D) Ratio
(OP)
Hi guys,
Anyone knows is there any requirement in ASME Section VIII mentioned about the length/diameter ratio?
If no, any guideline/rule of thumb to follow?
P/S: It is an 2:1 elliptical horizontal pressure vessel
Anyone knows is there any requirement in ASME Section VIII mentioned about the length/diameter ratio?
If no, any guideline/rule of thumb to follow?
P/S: It is an 2:1 elliptical horizontal pressure vessel





RE: Length/Diameter (L/D) Ratio
RE: Length/Diameter (L/D) Ratio
????
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Length/Diameter (L/D) Ratio
For elliptical heads you don't need the L/D ratio, see UG-33 in ASME VIII-1.
Regards.
RE: Length/Diameter (L/D) Ratio
Regards.
RE: Length/Diameter (L/D) Ratio
Basically, we are proposing a pressure vessel with ID: 2000mm and TL/TL: 5500mm.
But the client commented the length/diameter ratio (5500/2000 = 2.75) is too small.
Usually, it needs at least 3.
So, my question is, does the ASME Section VIII mentioned about this requirement?
RE: Length/Diameter (L/D) Ratio
You’ve also not stated the function of the vessel. A slug catcher will likely have a different L/D ratio than a separator, or a compressor suction drum, for example. The process requirement will generally dictate whether a vessel needs to be long and skinny, short and fat, or vertical/horizontal.
RE: Length/Diameter (L/D) Ratio
What's the L/D of a common household propane container - as with the 20 pound tanks usually used for grills in the US?
The ASME is a mechanical organization. Whether or not the container functions as the process engineer intended it to is not a concern for Section VIII. Sounds to me as though your client got some rule of thumb from a process engineering perspective and is now trying to ask "intelligent sounding" probing questions since he has little experience to base a conversation on.
RE: Length/Diameter (L/D) Ratio
Regards
r6155
RE: Length/Diameter (L/D) Ratio
If there is no other criteria, specify volume only and let fabricators pick the most economical dimensions- which may vary from fabricator to fabricator, from place to place.
RE: Length/Diameter (L/D) Ratio