7 replies to this topic

[Jiten_process]

hello everybody.

Please see attached sketch for horizontal storage vessel. There is horizontal tank used to store the chemical. We are providing the level guage on the side of the horizontal vessel. I want to calculate the height from top to locate nozzle for level guage.

Note that dish ends are elipsoidal. I am not furnishing the chemical data because i feel its not required here.

I just have a wage idea that there is some formulae used but i could not get it.

Please suggest.

Attached Files

•  Tank_volume.xls   26KB   420 downloads

[Art Montemayor]

Jitan:

This is a very common task occurring frequently at the processing plant level. After several years of putting up with the challenge, I finally got tired of it and developed equations to resolve this necessity. Later, with the advent of PCs and spreadsheets, I converted my notes and files to a workbook. What you need is my workbook and you can find it within our Forums as “Vessel Volumes”. Use the search function and you will find it.

I thought by now that everyone had it.

What is a “wage” idea?

[HanleyPc]

Hi,

I work designing road tanker vessels and I would like to know an easy way to calculate the partial volume and hence the centre of gravity shift of a sloping tank as it is filled.

Appreciate the help.

Mike...

[Qalander (Chem)]

Dear Jiten/Our art.Esq;

Actually I was slightly late in pointing out that you (Art) have already provided this info as Excel sheets easy to use; search only for few seconds, Maybe a minite.

Moreover, Jiten probably implied 'vague', and inadvertantly spelled 'wage'.

Best regards
qalander

[Jiten_process]

Thanks a lot art for your quick response, I found that excel sheet, I realized i would have rather searched out first.

And ya, Qalander is correct. Inadvertently i made a mistake in spelling. Actually i submitted my question in haste, office hours were over and my office was about to get closed.

Neways, thanks for your direction.

[Pacsal]

hello everybody.

Please see attached sketch for horizontal storage vessel. There is horizontal tank used to store the chemical. We are providing the level guage on the side of the horizontal vessel. I want to calculate the height from top to locate nozzle for level guage.

Note that dish ends are elipsoidal. I am not furnishing the chemical data because i feel its not required here.

I just have a wage idea that there is some formulae used but i could not get it.

Please suggest.

Hi there,


A great site for maths is "Wolfram Mathworld".

You should separate your problem in two:
1. Finding the volume as a function of hight of the cylinder
2. finding the volume as a function of hight of the two semi-ellipsoids (one full ellipsoid)

For 1. Volume V is area of base x hight (length of vessel w/o the ellipses)
for the calculation of that area, try this (http://mathworld.wolfram.com/CircularSegment.html)

For 2. I guess it is the two of the three axis are equal, so will have to "rename" your ellipsoids to "Spheroids"; so try the following link (http://mathworld.wolfram.com/Spheroid.html). In the formula that is given with integrals, just set the limits accordingly: "a" is the radius of your spheroid (and the cylinder), "c" is the remaining radius of your ellipse. To calc as a function of h (liquid's hight) set the outer limmits (1st intergral) to lower "-c" & upper "h-c".

I hope I have helped.
Pacsal

[cea]

I have developed a spreadsheet where in you need to feed diameter of vessel, TL-TL, hold-up volume requirement, LLLL percentage (for interlock trip), LLL percentage (for level alarms). You can try it & check the results.

Regards,
cea

Attached Files

•  Estimation_of_Level_Alarms_settings.xls   72KB   236 downloads

[kuldeepd]

http://www.processca...alibration.aspx

hope this helps.