When placing a shell-and-tube heat exchanger with a non-removable tube bundle such as a lube oil cooler with fixed tube sheets into service, to avoid thermal shock what statement represents the correct operating procedure?

Correct Answer: Option C — Introduce both the cooling water and the lubricating oil simultaneously and gradually to avoid thermal shock.

Under USCG National Maritime Center examination standards, the accepted correct answer is: Introduce both the cooling water and the lubricating oil simultaneously and gradually to avoid thermal shock..