Example 7-11 Storing Benzene in Cone Roof Tank

Example 7-11 Storing Benzene in Cone Roof Tank 

If this volume were needed to be expressed at 55°F and 1.5 psig, then using the gas laws  

The capacity of a relief valve for a tank has been calculated to be 50,000 cu ft/hr at I10°F and 1.0 psig, with a benzene vapor. Determine the required free air capacity. For benzene MW = 78.11 

000 gallon outdoor vertical storage tank contains benzene. The tank is not insulated, but has a dike around it with a volume equal to one-and-a-half times the volume of the tank. Size 15 diameter X 20. Tank does not have weak roof. Temp. = 60°F, pressure = 14.7 psia. 

Latent heat of vaporization 169 BTU/lb Tank size (nominal) 15 diameter and 20 high Operating pressure 1.5 oz/in.2 Maximum allowable tank pressure 3.5 oz/in.2 Maximum allowable vacuum 1.0 oz/in.2 Relief valve settings  

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