| 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? |
| A) Introduce the cooling water first, then gradually introduce the lube oil until full flow is established to avoid thermal shock. |
| B) Introduce the lubricating oil first, then gradually introduce the cooling water until full flow is established to avoid thermal shock. |
| C) Introduce both the cooling water and the lubricating oil simultaneously and gradually to avoid thermal shock. |
| D) Introduce both the cooling water and the lubricating oil simultaneously establishing full flow of both fluids immediately to avoid thermal shock. |
