What a Failed Steam Trap Actually Costs a Plant

A steam trap has two failure modes, and both are expensive. Failed open, the trap passes live steam into the condensate system around the clock. Failed closed, condensate backs up into the coil or tracer, heat transfer collapses, and water hammer follows. Most plants find their failed traps during neither mode's early stages; they find them in the fuel bill or in a frozen coil in January.

Sizing the failed-open loss

Leak rate depends on the trap's orifice diameter and the steam pressure. As a rule of thumb derived from the Napier flow equation, a trap with a 1/4 inch equivalent orifice on 100 psig steam loses on the order of several hundred pounds of steam per hour. Run that trap 8,000 hours a year at a typical steam cost of $10 to $15 per thousand pounds, and one failed trap is a five-figure annual line item.

The exact arithmetic matters less than the order of magnitude: one failed trap is a pickup truck idling in the parking lot all year, forever. A plant with fifty traps and a typical 10 to 15 percent failure rate has several of them.

The failed-closed cost is downtime

Failed-closed traps rarely appear in energy math, but they show up in production reports: coils that cannot hold temperature, tracers that freeze during a winter cold snap, water hammer that cracks fittings. In freeze protection duty, one failed trap can take out an entire traced header.

What a survey returns

A proper survey tests every trap with ultrasonic and temperature methods, tags each station, and returns a report: trap, condition, estimated loss, and recommended repair with payback. Repairs are prioritized so the worst leaks get fixed first, and the report becomes the baseline for the next cycle. Plants that survey annually typically hold trap failure rates in the low single digits.

Control Factors Portland performs steam trap surveys across Oregon, Washington, and Idaho. Our steam trap savings calculator gives a defensible estimate of your exposure before you book.