Tanks are used for the storage fluids in many chemical process industries. For a horizontal cylinderical tank, the two ends (heads) of the vessels is usually both flat, dished, elliptical or hemispherical. It is commonly required to estimate the quantity of fluid in a tank when it is partly filled with fluid, and only fluid level is known. This partial volume is made up of the volume in the cylinderical shell plus the volumes in the two heads. The partial volumes can be estimated by the equations below:

Partial volume of horizontal cylinder:

= {r2cos-1[(r - h)/r] - (r - h)(2rh - h2)0.5}L

Partial volume of dished heads:

= 0.215483*h2(1.5d - h)

Partial volume of elliptical heads:

= 0.5236*h2(1.5d - h)

Partial volume of hemispherical heads:

= 1.0472*h2(1.5d - h)

where

L = side length of the cylinder shelld = internal diameter of the cylinderr = radius of the cylinder = d/2h = height of liquid in the cylinder

All volume equations give fluid volumes in cubic units from tank dimensions in consistent linear units.

BIBLIOGRAPHY

Read more: http://www.egpet.net/vb/threads/4067-Horizontal-Cylinderical-Tanks#ixzz3RmliODSUhe blank dia for a torispherical dish end is equal to 1.22 D where D is the outside diameter of the straight face. after getting the blank diameter you have to check wether it fits into a commercially available plate size... ususally plate size available is 1500mm X 7500mm so you have to check wether the blank dia obtained by you is not more than 1500 if its below 1500 then just procure a plate size of 1.22D x 1.22D x nominal thickness.

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Read more: http://www.egpet.net/vb/threads/18762-Article-Calculation-for-Dishend-of-Vessel#ixzz3RmnCcrlP