Which of the following is a correct set of preventive maintenance steps for a thermowell and its protective sleeve?

• A. Tighten all bolts to maximum torque and ignore leaks.
• B. Inspect for corrosion, fouling, or damage; check for leaks around the insertion point; verify sealing gaskets; ensure the thermowell is not cracked; clean, replace sleeves if worn; record inspection results.
• C. Replace the sleeve only every 10 years regardless of condition.
• D. Calibrate the transmitter using process signals before inspecting the thermowell.

Answer: (B)