Which test method can be used to assess steam trap operation?

Flow indicators are the preferred test method for assessing steam trap operation because they allow for direct observation of the flow of steam or condensate through the trap. In a properly functioning steam trap, you should be able to see a consistent flow of condensate when the system is in operation. If the flow is interrupted or not flowing according to the expected rate, this could indicate that the steam trap is not functioning properly, either due to blockage, incorrect sizing, or other mechanical issues.

Pressure gauge readings can give useful information about the system's pressure but do not provide direct insight into the flow behavior or the operational state of the steam trap itself. Electrical resistance tests are typically not applicable to steam traps, as they don’t provide relevant information about their performance. Chemical analysis is unrelated to steam trap operation and is usually used for assessing the composition of fluids rather than mechanical device functionality. Thus, flow indicators serve as the most effective method for evaluating steam trap performance directly.