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 prevent water hammer what statement represents the correct operating procedure?

Correct Answer: Option D — Introduce the heavy fuel oil first, then crack open the condensate drains. Gradually introduce the steam, then close the condensate drains when no longer draining condensate and issuing dry steam.

Under USCG National Maritime Center examination standards, the accepted correct answer is: Introduce the heavy fuel oil first, then crack open the condensate drains. Gradually introduce the steam, then close the condensate drains when no longer draining condensate and issuing dry steam..