Heat Transfer Fluid Replacement Precautions

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What is the purpose of locating the pump below the expansion tank?

To cool down the thermal fluid

To enhance heat transfer in the system

To increase the flow rate of the pump

To prevent cavitation in the pump suction (correct)

Why are centrifugal pumps the preferred type in liquid thermal systems?

Because they cool down the thermal fluid efficiently

Because they are more compact than other types of pumps

Because they provide higher flow rates (correct)

Because they require less maintenance

What is a common auxiliary equipment found in liquid thermal systems?

Thermal insulation

Electric heaters

Pneumatic cylinders

Valves (correct)

Why are circulating pumps in liquid thermal systems often water-cooled?

To prevent overheating of the system Signup and view all the answers

Which major equipment plays a central role in the return system of liquid thermal systems?

Motorized pump Signup and view all the answers

What is the main purpose of a hot oil system in a plant?

To transfer heat from a central source to different plant areas Signup and view all the answers

How do heat transfer fluids used in hot oil systems differ from steam?

Heat transfer fluids run at a lower temperature than steam. Signup and view all the answers

Why are high temperature process applications preferred with heat transfer fluids like hot oils?

Because they can handle high temperatures without breaking down. Signup and view all the answers

What led to the breakdown of the original oils used in heat transfer fluids?

Getting partially oxidized and thermally unstable Signup and view all the answers

Why are hot oil systems often registered at lower levels than equivalent steam systems?

Because of the lower vapor pressure and lower regulatory requirements Signup and view all the answers

What is a fundamental difference between hot oil systems and hot water heating systems?

Hot oil systems operate at lower pressures than hot water heating systems. Signup and view all the answers

What is the consequence of not cleaning the system before recharging it with fresh heat transfer fluid?

Decrease in tube wall life Signup and view all the answers

What is the main reason why exposed piping systems using heat transfer fluid pose a burn hazard to personnel?

High operating temperature of the piping Signup and view all the answers

Which pump type is considered preferable in liquid thermal systems due to higher flow rates?

Centrifugal pump Signup and view all the answers

What is the typical efficiency range for radiant heaters used in heat transfer fluid systems?

40–50% Signup and view all the answers

In a combination radiant and convection heater, where does heat transfer occur?

By both radiation and conduction Signup and view all the answers

What is a key reason why a concrete dike surrounds the foundation of the fired heater?

To prevent hot oil spills Signup and view all the answers

What is a key advantage of using heat transfer fluids (HTFs) over steam?

Low system pressures Signup and view all the answers

In a vapour-based heat transfer system, what does the saturated gas function as?

Heat transfer medium Signup and view all the answers

Why are liquid thermal systems preferred to use centrifugal pumps?

Centrifugal pumps offer higher flow rates Signup and view all the answers

What can cause blockage of pipes and valves in a heat transfer system?

Sedimentation from solids Signup and view all the answers

Why are vapour heat transfer systems generally considered more expensive and complex than liquid systems?

Higher heat transfer rates and temperatures Signup and view all the answers

Which type of heat transfer fluid is typically used for very high process temperatures over 400°C?

Molten salts Signup and view all the answers

Why is the expansion tank critical for the operation of a heat transfer system?

To allow fluid to expand or contract with temperature changes Signup and view all the answers

What can cause corrosion issues within a heat transfer system?

Cleaning fluids left in the system at start-up Signup and view all the answers

How do vapour phase heat transfer systems differ from liquid systems?

They have higher operating temperatures. Signup and view all the answers

What happens to heat transfer fluids over time in elevated temperatures?

They have an increasing potential to deteriorate. Signup and view all the answers

What is the purpose of the expansion tank in a hot oil system?

To accommodate thermal expansion and contraction of the fluid Signup and view all the answers

Why is a low hot oil flow indicating device installed in the outlet line from the heater?

To detect an overheating situation and prevent tube failure Signup and view all the answers

What is the main function of a burner flame failure device in a hot oil system?

To shut off fuel to the burner in case of flame out Signup and view all the answers

Why is a high stack temperature indicator important in a hot oil system?

To signal a tube failure and overheating in the furnace space Signup and view all the answers

What role does an emergency shutdown device play in a hot oil system?

Manually shutting down the plant in case of equipment malfunction or danger Signup and view all the answers

Why is it recommended to leave the suction valve of the standby pump open all the time?

To allow hot oil to flow backwards and maintain pump temperature Signup and view all the answers

What happens if any of the protective devices in a hot oil system senses a malfunction?

The automatic gas shut-off valves close, cutting off fuel supply to burners Signup and view all the answers

Heat Transfer Fluid Replacement Precautions

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Questions and Answers

What is the purpose of locating the pump below the expansion tank?

Why are centrifugal pumps the preferred type in liquid thermal systems?

What is a common auxiliary equipment found in liquid thermal systems?

Why are circulating pumps in liquid thermal systems often water-cooled?

Which major equipment plays a central role in the return system of liquid thermal systems?

What is the main purpose of a hot oil system in a plant?

How do heat transfer fluids used in hot oil systems differ from steam?

Why are high temperature process applications preferred with heat transfer fluids like hot oils?

What led to the breakdown of the original oils used in heat transfer fluids?

Why are hot oil systems often registered at lower levels than equivalent steam systems?

What is a fundamental difference between hot oil systems and hot water heating systems?

What is the consequence of not cleaning the system before recharging it with fresh heat transfer fluid?

What is the main reason why exposed piping systems using heat transfer fluid pose a burn hazard to personnel?

Which pump type is considered preferable in liquid thermal systems due to higher flow rates?

What is the typical efficiency range for radiant heaters used in heat transfer fluid systems?

In a combination radiant and convection heater, where does heat transfer occur?

What is a key reason why a concrete dike surrounds the foundation of the fired heater?

What is a key advantage of using heat transfer fluids (HTFs) over steam?

In a vapour-based heat transfer system, what does the saturated gas function as?

Why are liquid thermal systems preferred to use centrifugal pumps?

What can cause blockage of pipes and valves in a heat transfer system?

Why are vapour heat transfer systems generally considered more expensive and complex than liquid systems?

Which type of heat transfer fluid is typically used for very high process temperatures over 400°C?

Why is the expansion tank critical for the operation of a heat transfer system?

What can cause corrosion issues within a heat transfer system?

How do vapour phase heat transfer systems differ from liquid systems?

What happens to heat transfer fluids over time in elevated temperatures?

What is the purpose of the expansion tank in a hot oil system?

Why is a low hot oil flow indicating device installed in the outlet line from the heater?

What is the main function of a burner flame failure device in a hot oil system?

Why is a high stack temperature indicator important in a hot oil system?

What role does an emergency shutdown device play in a hot oil system?

Why is it recommended to leave the suction valve of the standby pump open all the time?

What happens if any of the protective devices in a hot oil system senses a malfunction?

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