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

Question

Accepted Answer

Gradually secure the steam first, then secure the heavy fuel oil to avoid thermal shock.

Answer

Secure both the steam and heavy fuel oil simultaneously and immediately to avoid thermal shock.

Answer

Secure the heavy fuel oil first, then gradually secure the steam to avoid thermal shock.

Answer

Secure the steam and heavy fuel oil simultaneously and gradually to avoid thermal shock.

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