D/L preferred ratios for horizontal tanks?
D/L preferred ratios for horizontal tanks?
(OP)
Hello everybody.
Are there preferred proportions for horizontal pressure vessels.
We need to define a preliminary size for a horizontal vessel that would be used for the storage-process of fuels with thorispherical heads. The required capacity is 48m3 (12682gal). Is there such a criteria for L/D (lenght/diam) ratios for horizontal tanks? Could somebody please provide values, formulas or tables.
Are there preferred proportions for horizontal pressure vessels.
We need to define a preliminary size for a horizontal vessel that would be used for the storage-process of fuels with thorispherical heads. The required capacity is 48m3 (12682gal). Is there such a criteria for L/D (lenght/diam) ratios for horizontal tanks? Could somebody please provide values, formulas or tables.





RE: D/L preferred ratios for horizontal tanks?
If not in the US, check with local fabricators to see what works best for them.
RE: D/L preferred ratios for horizontal tanks?
You say that these tanks will be used to store "fuel".???
You are aware that flat bottomed API-650 style tanks are usually cheaper on a $/gallon basis.....right ??
Horizontal tanks (sometimes called drums)are preferred when the tank is located on concrete piers or up in a structure.
Most atmospheric horizontal tanks have shell lengths from 3D to around 6D.
Horizontal pressure vessels are different and may have much longer shells fo a given diameter.
What are the volumes stored and specifically what are the contents ?
-MJC
RE: D/L preferred ratios for horizontal tanks?
The design is not ours and will be defined in the future by a contractor, but we need to have a preliminary idea of the possible area that will be used by the tank (for lay-out purposes).
RE: D/L preferred ratios for horizontal tanks?
Procedure 2-19: Optimum Vessel Proportions.
RE: D/L preferred ratios for horizontal tanks?
RE: D/L preferred ratios for horizontal tanks?
As you haven't mention your vessel's design press, material of construction, joint efficiency and corrosion allowance, the optimum L/D ratio can't be worked out precisely.
It seems that for pressure range of 0-250 PSIG, L/D ratio around 3 makes sense.
You may slightly modify this ratio acc. to standard plates dimensions available for you.
Vessel's dia. Is:
D={(4*V)/[PI*(0.3333+L/D)]}^1/3
I hope this helps.
RE: D/L preferred ratios for horizontal tanks?
Since we have established that an ASME type pressure vessel is required, it is reasonable to say that having a longer vessel may be somewhat cheaper.
Pressure vessel heads are purchased in 6 inch ID increments(as stated above)
Some candidates to consider are:
Dia: 9'-0" Straight shell: 24'- 9"
Dia: 8'-6" Straight shell: 28'- 0"
Dia: 8'-0" Straight shell: 32'- 0"
Dia: 7'-6" Straight shell: 36'- 9"
Dia: 7'-0" Straight shell: 45'- 6"
Much beyond 45 feet and you will find delivery very expensive.
All dimensions are STRAIGHT SHELL not OAL..!!
All dimensions are approximate
Does this help ?
MJC
RE: D/L preferred ratios for horizontal tanks?
I love eng-tips.