The plant has asked you to consider the consequences of a tank explosion with resulting overpressure

The plant has asked you to consider the
consequences of a tank explosion with resulting overpressure for options a and
c in Problem 7-34. For both cases assume that the storage tank is drained of
all liquid and contains only the saturation vapor pressure for liquid toluene
at 25C and 1 atm total pressure with air.

a. What is the volume percent concentration
of toluene in the vapor of each tank? b. If the tank contains air, is this
concentration flammable? c. What is the stoichiometric concentration for
toluene in air? Is the vapor in the tank fuel rich or fuel lean? d. If an
ignition and

The plant has asked you to consider the
consequences of a tank explosion with resulting overpressure for options a and
c in Problem 7-34. For both cases assume that the storage tank is drained of
all liquid and contains only the saturation vapor pressure for liquid toluene
at 25C and 1 atm total pressure with air.

a. What is the volume percent concentration
of toluene in the vapor of each tank? b. If the tank contains air, is this
concentration flammable? c. What is the stoichiometric concentration for
toluene in air? Is the vapor in the tank fuel rich or fuel lean? d. If an
ignition and explosion occur within the storage tank, estimate the overpressure
at the process boundary for each case. e. Which case is acceptable? Discuss. f.
What additional design features will you recommend to reduce the probability of
an explosion?

PROBLEM 7-34

Your plant is considering installing a 5000
m3 low-pressure cone-roof storage tank. The tank will store toluene (C7H8 ).
The plant is considering several options:

a. A single tank within 10 m of the
process. b. Multiple, smaller tanks within 10 m of the process. This option
requires 200 m of additional piping plus additional valves. c. A single tank
100 m from the process. This requires 150 m of additional piping. d. Multiple,
smaller tanks 100 m from the process. This requires 1000 m of additional piping
plus additional valves. Consider each option and list the inherently safer
features associated with each. Select the single option that represents the
most inherently safe design. Please make sure to provide support for your
selection. What additional questions should you ask to improve the inherent
safety of this installation?