Which statement about the role of a steam trap is correct?

• A. To remove condensate from steam lines while preventing steam loss
• B. To regulate steam pressure
• C. To filter impurities from steam
• D. To convert steam to liquid

Answer: (A)

The essential job of a steam trap is to remove condensate from steam lines while preventing the loss of live steam. It senses when condensate (water from condensation) is present and opens to discharge that liquid, then closes to keep the steam chamber sealed. This keeps heat transfer efficient and prevents water hammer, while avoiding letting valuable steam escape.

It isn’t designed to regulate steam pressure—that’s what a regulator or pressure-reducing valve does. It also isn’t a filter for impurities, nor does it convert steam into liquid; condensation happens as steam loses energy, and the trap simply removes that liquid without letting more steam escape.