Steel Oil Tanks and API 650 Standards

contact mr.abdel halim galala

What about me, I feel neglected .......................

(I guess my efforts aren't welcome - oh well I have better things to do)

Forget you Guest.!!!!

(by the way - this is the old 'Guest.' with a new account - sb straightened me out)

I just don't have time to answer right now - that is a pretty big question.

Sorry. Yeah you 2

My dear ducon, thank you very much, and I'd like our dear Guest. to participate and I will give him my GA.

Hey, thanks Abdel - but I still don't have time to tackle this question - I am knocking off other, easier ones.

Signed,

"No longer Guest. but now XMech"

Dear Dr

I waz hoping that yu could help on this issue , or maybe guide me to somewhere that coud .

Regards

1) what is the difference between ( Wind Girder , Compressions ring , unstiffeneing ring
......) .

Wind Girder: Normally required on open top and external floating roof tanks because the wind
acts across the wall on the inner surface and can have the effect of a vacuum load (not
really an issue when the tank is full).
The roof fixed roof tanks assist in keeping the shell rigid and the wind forces are transmitted to
the bottom of the tank. Therefore, with open tanks a circumferential top wind girder
is provided at or near the top of the shell to give it the necessary stiffness, it is usually
attached to the external surface and in many cases is also used as an access and maintenance
platform. Depending on the stability of the shell, intermediate wind girders (and maybe more)
may also be required

Compression rings: All closed tanks which are subjected to an internal pressure whichi is in
excess of the weight of the roof plates, try to adopt a spherical form, whereby the
meridional and latitudinal stresses at any given point in the containment parts would tend
to equalize.
The two critical areas are the shell-to-bottom joint, and the shell-to-roof joint. The
bottom joint is dealt with by the thickness of the shell and bottom, but in the case of the
roof-to-shell joint, additional "area" (compression rings) may be required to resist this
compressive force and/or buckling. Please see Appendix F; Fig. F-2 & Sec. F-5

Stiffening rings (I believe that is a typo 'un'): May be used generically for the above two
terms, but also refers to all other stiffening required - particulary due to external wind
loads on the shell, vacuum conditions, stiffening of roof plates, insulation loads, platform
loads, and snow loads.

2) Roof to shell frangibility Calculations ( I couldn't really understand how to specify
the areas involved in these calculations - Participating area of shell, Participating area
of Roof , cross sectional area of the roof to shell junction ...etc )

Please refer to Appendix F; Fig. F-2 and nomenclature for Wc & Wh - use in conjunction with
requirements of Sec 5.10.2.6

3) Design Calculation for flush type opening , what are they exactly ( flush type opening ).

Flush type openings are at the shell-to-bottom joint and are flush with the floor of the
tank. They may be rectangular shaped to facilitate clean-out operations or nozzles to
allow for full drainage (and clean-out). Refer to Sec. 5.7.7

4) Anchorage Checking

I don't know what to say other than review Sec 5.12

5) Is there any Portal which is specialized in this concern
( oil storage tank design -API 650)

Computer programs include: TriTank 650; Coade "Tank"; ITSDesign; ETank; ........

6) Is there any free software or an excel sheet that could help in the design process.

Perhaps ITSDesign, or simply try Googling yourself

Dear

I truly appreciat the time and effort that you have shown in answering my questions .

I will look closly to your answer and get back to the API ( sections refered by you )

Your answers were very useful

THANK YOU