Which of the following is a method for testing steam trap operation?

Using strap-on thermometers is an effective method for testing steam trap operation because it allows for the measurement of temperature differences across the steam trap. When a steam trap is functioning correctly, there should be a notable temperature drop between the inlet (steam side) and the outlet (condensate side) of the trap. If the steam trap is faulty, this temperature difference will either be minimal or absent, indicating that steam is leaking through or that the trap is not opening/closing properly.

This method provides a straightforward and reliable means of assessing whether the steam trap is effectively separating the steam from the condensate and ensuring proper operational efficiency within the steam system.