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Internal or External Floating Roof??

Internal or External Floating Roof??

Internal or External Floating Roof??


Currently I'm working in the selection of the most suitable roof type for 6 crude storage tanks. The storage tanks will be internally heated and externally insulated in order prevent wax formation.

The crude specification and storage conditions are the following:

Stabilised Crude Specification

Specification        Unit    Value
VP at 37.8 C         bara    0.22
RVP, max        psia    10.0
BS&W, max        vol%    0.5
Flash Point, min      ºC    60
Salinity, max         PTB    25
Cloud point          ºC    60
Pour point          ºC    36-42

 Crude Storage Conditions
Specification        Unit    Value
Pressure        barg    0
Temperature          ºC    75
VP at 75oC         psia    11
Density at 75 C       Kg/m3    827
Viscosity at 75 C     cP    13.3

Note that storage temperature is above of flash point and vapor pressure is high (11 psia)

Tank capacities are: 5 of 50.000 bbl, 1 of 15.000 bbls

I hope that you could helpme to select the most suitable roof tank:
a. Inernal Floating roof (cone or dome),
b. External Floating roof.

thanks for your help

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