When a steam trap fails, is it better to fail open or fail closed?

• A. Open because it still removes condensate
• B. Closed because it prevents loss of steam
• C. Partially open to allow some condensate through
• D. Indeterminate and requires inspection

Answer: (A)

When a steam trap fails, the safer outcome is for it to fail open. The trap’s job is to remove condensate from the steam system while letting steam pass. If the trap fails open, condensate continues to be discharged, preventing the buildup of condensate that can cause water hammer, pressure spikes, and potential damage to piping and equipment. The downside is some steam is lost, but that energy loss is generally less dangerous than the consequences of condensate backing up in the line. If the trap were to fail closed, it would block condensate drainage, leading to accumulation, higher pressure, and a high risk of water hammer and equipment damage.