INTERVIEW QUESTIONS
INTERVIEW QUESTIONS
1. What is tank farm?
Tank
farm is an area where there are many
storage tanks. The tank area will normally be isolated from the main plant area
to avoid fire accident exposures. The
tanks are numbered and colored according to product storage.
2. Why dyke wall is provided around the tank farm?
The
tank farm is surrounded by a dyke wall, which is a concrete wall surrounding
the tank farm to prevent the product spread in case of leakage from the tanks.
The volume inside the dike wall should be more than the volume of the tanks
inside the dike wall.
3. What is the purpose of a tank?
The
purpose of a tank is to store liquid. The liquid may be a raw material, an
intermediate processed material or a finished product.
4. What are the main classification of storage tanks?
Atmospheric
Storage and Pressurized storage
5. Which type of tanks comes under the category of atmospheric storage tanks?
Open
top, Fixed roof and floating roof
6. Which type of tanks comes under the category of pressurized storage tanks?
Spherical
tanks and bullet tanks
7. When the floating roof tanks are preferred?
Floating
roof tanks are preferred when the liquid stored has a high evaporation loss. In
floating roof tanks the roof floats on the top of the liquid, rising and
falling with the level. Floating roofs help reduce evaporation and prevent the
buildup of dangerous gases that often occur with flammable liquids.
8. Explain about Spherical tank?
Spherical
tanks are also known as Horton Sphere
tanks. Due to sphere the pressure gets distributed equally to all sides.
Spherical tank has the least surface area to volume ratio. Stress concentration
will be minimum in a spherical shape. The wall thickness of spherical shell
will be very less when compare the volume to handle the same in other shape
vessels. Spherical tanks are used primarily for storing liquefied petroleum
gases like butane, methane, or propane
9. What is the relation between tank dimensions and soil condition?
For
soil with poor bearing strength, tanks with low shell height but large
diameters are economical. When shell height is large, the head pressure on the
soil will increase. If the shell height is to be increased in a poor bearing
strength soil, pile-supported foundations may be provided.
10. What are the different types of flooring for storage tanks?
a. Flat bottom
b. Cone down bottom (Bottom
Down) : Generally with cone roof tanks
c. Cone up bottom (bottom up) :
Generally for floating roof tanks
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