How often should safety valves be tested, and what is the standard test procedure?

• A. Typically annually or per code; test by lifting the valve to ensure it opens at the set pressure and reseats properly
• B. Monthly; remove the valve and inspect
• C. Every five years; rely on automatic testing
• D. Never; rely on maintenance schedule only

Answer: (D)

The main idea is that safety valves must be exercised regularly to prove they will relieve at the correct pressure and seal afterward. Without routine testing, a valve can stick, drift from its set pressure, or fail to reseat, leaving the boiler unprotected.

Typically, safety valves are tested at least annually and in accordance with applicable code or manufacturer requirements. After any maintenance, replacement, or adjustment, testing is often required to confirm the set pressure remains within tolerance and that the valve will operate as designed. Some plants may have more frequent tests based on process risk or code mandates, but annual testing is a common baseline.

A standard test procedure involves using a suitable test setup to lift the valve and confirm it opens at the set pressure, then ensures it relieves properly and reseats as pressure falls below the set point. The test should also check that there is no leakage when the valve is closed, that the discharge path is unobstructed, and that the valve can handle its relief capacity. Documentation of the results is essential, and any deviation from the expected set pressure or reseating behavior typically triggers corrective action or replacement.