When temperatures drop, you may notice more visible steam around your plant, especially at trap outlets. While it is natural to assume a leak, the appearance of steam discharge does not always indicate a malfunction.

Flash steam forms when hot condensate is released to a lower pressure and part of it vaporizes, creating a visible plume. A functioning trap can produce differing amounts of flash steam as operating conditions change, and traps of different types can release steam in noticeably different patterns even at the same pressure. Depending on pressure, condensate load, and trap design, flash steam can look very similar to live steam escaping from a leaking trap.

So, how can you tell what is normal and what is not? Learn what to look for when assessing traps in the field, and watch videos with real examples of flash steam and steam leaks, discharge patterns from different trap types, and what steam discharge looks like under different operating conditions.