18 Questions
What is the purpose of the outer mild steel shell in the storage tank?
To prevent corrosion
What should the edges of the inner shell of the storage tank have?
Smooth finish
What is the minimum recommended radius for the edges of the inner shell of the storage tank?
25 mm
What should be done if a drain from the lowest point of the tank is not possible?
Slope the bottom towards the outlet valve side
What is the purpose of providing vertical silo tanks outside the processing section for extremely large quantity of storage?
To avoid the need for tall buildings
Why is the outer shell of mild steel used in storage tanks?
To prevent corrosion
Why is it important for the inner shell of the storage tank to have a smooth surface finish and no sharp corners?
To aid in proper cleaning
What must be done if a drain from the lowest point of the tank is not possible?
Slope the bottom of the vessel towards the outlet valve side
What is the typical thickness of insulation provided for lower temperatures?
10 to 15 cm
Why are the ends of tanks usually dish shaped?
To provide a greater knuckle radius at the joint of dish end
How much should the increase in temperature of fluid be limited when filled in the tank?
2°C in 18 hours
Why might a gap be provided between the two sheets of SS and MS in some tank designs?
To allow for expansion due to temperature changes
What is the purpose of the Thermo-well in the storage tank?
To measure the temperature of the milk in the tank
Why are agitators commonly supported at the bottom by a bush in the tank?
To prevent lateral oscillation
What is the purpose of the air vent in the tank?
To avoid build-up of pressure during loading
What is the function of the sampling cock in the tank?
To sample and test the milk in the tank
Why must the reduction gear mechanism be perfectly sealed?
To prevent oil leaking into the tank
What is the purpose of providing a ladder in front of tanks with sight glass?
To observe the milk level through sight glass
Study Notes
Storage Tank Design
- The outer mild steel shell provides additional protection against external corrosion and mechanical damage.
Inner Shell Design
- The edges of the inner shell should be rounded to prevent sharp corners and facilitate easy cleaning.
- The minimum recommended radius for the edges of the inner shell is 1.5 mm to prevent sharp corners.
Drainage and Slope
- If a drain from the lowest point of the tank is not possible, a slope of at least 1:100 should be provided to ensure effective drainage.
Vertical Silo Tanks
- Vertical silo tanks are used outside the processing section for storing extremely large quantities of materials.
Material Selection
- Mild steel is used for the outer shell because it is less expensive and provides adequate protection against external corrosion.
- The inner shell is typically made of stainless steel (SS) for corrosion resistance and ease of cleaning.
Surface Finish and Corners
- A smooth surface finish and no sharp corners are essential for the inner shell to prevent product accumulation and facilitate easy cleaning.
Insulation and Temperature Control
- Insulation with a typical thickness of 50-100 mm is provided for lower temperatures to prevent heat transfer.
- The increase in temperature of the fluid during filling should be limited to 5-10°C to prevent thermal shock.
Gap Between Sheets
- A gap between the two sheets of SS and MS may be provided in some tank designs to prevent galvanic corrosion.
Thermo-well and Agitators
- The Thermo-well is used to measure temperature in the storage tank.
- Agitators are commonly supported at the bottom by a bush in the tank to prevent damage and ensure smooth operation.
Air Vent and Sampling Cock
- The air vent is used to allow air to enter or exit the tank during filling or emptying.
- The sampling cock is used to collect representative samples of the stored material.
Reduction Gear Mechanism
- The reduction gear mechanism must be perfectly sealed to prevent contamination and ensure reliable operation.
Ladder and Sight Glass
- A ladder is provided in front of tanks with sight glass to allow easy access for observation and maintenance.
Test your knowledge about different types of storage tanks, including their designs and materials. Explore the characteristics of vertical and horizontal silo tanks, as well as the use of stainless steel and insulation.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
