Inconyma (Mecanico) 1

[Inconyma]

¿Existen formulas para calcular el espesor de placas de cupula y fondo de un tanque de techo conico soportado? . Ó siempre sera el estandar que marca la norma de 6mm mas el factor de corrosión.



Are there formulas to calculate the thickness of the dome and bottom plates of a supported conical roof tank? . Or it will always be the standard that marks the norm of 6mm plus the corrosion factor.

 

[MJCronin]

"...will always be the standard that marks the norm of 6mm plus the corrosion factor"....

What does this mean ?... What standard marks this 6mm "norm" ??... Was this something someone told somebody once ?

Modern flat bottomed petrochemical tanks should be purchased, designed, inspected and tested to a nationally recognized code such as API-650. This is the way things are commonly done in the west....

The agreed upon tank code rules the preliminary costing, fabrication, construction and final acceptance of the tank

However, in certain other countries it seems that the tank is sold, deigned then built without a code .... Designers then search the world for justification of a design already built

All of this is my opinion only ...

MJCronin
Sr. Process Engineer

 

[BZ29]

INCONYMA: Considering API650 in context.... no, there is no calculation for thickness of bottom plates & supported conical/dome roof of tank. It will always be minimum thickness + CA, as required by code, unless there is some other reason for its increase.

 

[IFRs]

Are there formulas to calculate the thickness of the dome and bottom plates of a supported conical roof tank?

API 650 Section 5.10.5 includes self supported dome roof thickness calculations.

Bottom thickness is not calculated because per API 650 1.1.1 the standard applies only to tanks whose entire bottom is uniformly supported, therefore bottoms have no need for structural strength.

API 650 5.10.4.4 has a calculation for rafter spacing based on the cone roof plate corroded thickness but otherwise there is only minimum plus corrosion allowance.