Vertical tank design
Vertical tank design
(OP)
Hi,
I have to design an atm. vertical S.S tank ( 8'(dia., 30' H),
supported on skirt or legs. for milk , insulated .
for heads, I want to use fabricated conical with knuckle .
could some one response to theses questions please:
1- witch standards can I use.( I know API650, but this consider only vertical tank with flat bottom )
2- How can I calculate the thickness of the bottom heads.
3- I have used Compress program for ASME tank, and I consider that my design pressure is only atm. (=0), and a btm conical head with knuckle =6%, and the thk calculated is 5/8 po. witch is in my opignion very heigh, because ,in ASME code the safety factor (S.F) is about 3.5, and in other standards may be it less.
to confirm this statement?
4- How to design the legs if I want to welds them to Btm Head.
Thanks you.
I have to design an atm. vertical S.S tank ( 8'(dia., 30' H),
supported on skirt or legs. for milk , insulated .
for heads, I want to use fabricated conical with knuckle .
could some one response to theses questions please:
1- witch standards can I use.( I know API650, but this consider only vertical tank with flat bottom )
2- How can I calculate the thickness of the bottom heads.
3- I have used Compress program for ASME tank, and I consider that my design pressure is only atm. (=0), and a btm conical head with knuckle =6%, and the thk calculated is 5/8 po. witch is in my opignion very heigh, because ,in ASME code the safety factor (S.F) is about 3.5, and in other standards may be it less.
to confirm this statement?
4- How to design the legs if I want to welds them to Btm Head.
Thanks you.





RE: Vertical tank design
2- How can I calculate the thickness of the bottom heads.
See above.
3- I have used Compress program for ASME tank...and the thk calculated is 5/8: I would guess that this is due to the methods used rather than to the factor of safety. Try a larger knuckle radius or switch to an F&D head, or perhaps increase the cone slope.
4- How to design the legs if I want to welds them to Btm Head: See the various Pressure Vessel Handbooks for some information on designing supports. See ASCE 7 for applicable loads.
RE: Vertical tank design
Joe Tank
RE: Vertical tank design
thanks for your help, so you propose to use API 620 as Standards for this design, I think that API 620 is used specially for Large diameter Tank.
second ,in my case I can't increase my Knuckle radius, in my shop I'm limited regarding my forming machine to only
1 po.radius .so can I suppose that it's aproximatly the head have a conical shape. and calculate as then.
I haven't the API 620, could you give me only the formulas for calculating the bottom head with this shape.
Thank you again.
RE: Vertical tank design
Question: 3- I have used Compress program for ASME tank and 4-How to design the legs if I want to welds them to Btm Head.
Use Compress program to help you design the legs using 8 inch Dia. Pipe Sch 80 for the legs.
Reference ARCHITECTURAL INSTITUTE OF JAPAN
DESING RECOMMENDATION FOR STORAGE TANKS AND THEIR SUPROTS 1996 EDITION – Earthquake Resistant Design of Storage Tanks and Their Supports -
Dennis Moss Pressure Vessel Design Manual
RE: Vertical tank design
Regards,
Mike
RE: Vertical tank design
Can you just delete the knuckle all together? You may need a small compression ring then, but it would probably be easier to do than a knuckle.
RE: Vertical tank design
Dennis Moss Pressure Vessel Design Manual 3rd Edition.
Reference Page 109
Chapter 3
Design of Vessel Support
Section 109