When placing a shell-and-tube heat exchanger...

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Question 1 of 205eccef9bbacbc34ba4d45629

When placing a shell-and-tube heat exchanger with a removable tube bundle such as a bayonet-tube heavy fuel oil service heater into service, to avoid thermal shock what statement represents the correct operating procedure?

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🔍 Key Concepts

• Thermal shock in shell-and-tube heat exchangers and why sudden temperature changes are dangerous • Flow path of steam (heating medium) versus heavy fuel oil (heated fluid) in a bayonet-tube/removable tube bundle exchanger • Which side (steam or fuel oil) is more sensitive to rapid heating and how gradual warming prevents tube and bundle damage

💭 Think About

• In a cold heat exchanger, which fluid (steam or heavy fuel oil) will create the largest and fastest temperature change on the metal surfaces if introduced suddenly? • For safe operation, do we generally prefer to have the metal surfaces warmed up gently from the product side or shocked from the steam side? • Think about what happens if steam hits a cold, stagnant liquid in the tubes versus a liquid that is already flowing.

✅ Before You Answer

• Identify which side (steam or fuel oil) should be flowing first so the metal warms up gradually and evenly. • Check which option includes gradual introduction of the hotter, higher-energy medium (steam) rather than an abrupt application. • Eliminate any choices that involve immediate full flow of both fluids without gradual temperature increase.

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