Design of Cone Roof Type Storage Tanks For

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  5.3.1

General

5.3.1.1

The required shell thickness shall be the greater of the design shell thickness, including any corrosion allowance, or the hydrostatic test shell thickness, but the shell thickness shall not be less than the following:

5.3.1.3

The design shell thickness shall be computed on the basis that the tank is filled to a level H (design liquid level) with a liquid that has a specific gravity specified by the purchaser.

5.3.1.4

The hydrostatic test shell thickness shall be computed on the basis that the tank is filled to a level H (design liquid level) with water.

5.3.1.5

The calculated stress for each shell course shall not be greater than the stress permitted for the particular material used for the course. No shell course shall be thinner than the course above it.



à  à
 (Cont.)

5.3.3

Calculation of Thickness by the 1-Foot Method

5.3.3.1

The I-foot method calculates the thickness required at design points 03 m (I ft) above the bottom of each shell course.

5.3.3.2

The required minimum thickness of shell plates shall be the greater of the values computed by the following formulas:

Æn SÆ units:

td = 4.9D(HȄ0.3)G Sd t t = 4.9D(HȄ03) St

+ CA



à  à
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where td   design shell thickness, in mm, tt = hydrostatic test shell thickness, in mm, D = nominal tank diameter, in m r of the top joined (that is, the shell plate or the bottom H = design liquid level, in .mm, = height from the bottom of the course under consideration to the top angle, if any; to the bottom of any overflow that of the shell including the top limits the tank filling height; or to any other level specified by the purchaser, restricted by an inter-nal floating roof, or controlled to allow for seismic wave action,

by the

G   design specific gravity of the liquid to be stored, as specified purchaser, CA = corrosion allowance, in mm, as specified by the purchaser Sd   allowable stress for the design condition, in MPa St=allowable stress for the hydrostatic test condition, in MPa

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