However, doing that changes the parameters of the closed system and, therefore, can be unreliable. He recognizes, however, that portable infrared thermometers provide close estimations of pressures on valves, traps, and coil heaters. And he notes that these devices are also useful for spotting conditions such as heat loss, the need for insulation, overheating, overloads, and cooling failures. Thus, he recommends that an infrared thermometer be used along with ultrasound. Agreeing with Banyacski, Loken says that traps that have failed completely open are easy to detect, but he points out that the object is to find failing traps before they fail completely.
Ultrasonic testing can do that.
And regarding frequency of inspections, he recommends that process components of equipment as well as drip, main steam traps should be checked twice a year. He also stresses the importance of instituting a reporting system to keep tabs on the location, type, size, capacity, and condition of all traps in a steam system. He says that a steam system maintenance program should provide total-system training and include a reference manual written for plant personnel so they will have a reliable guide for the future. Ideally, the program will also include videotapes to illustrate troubleshooting techniques and applications. Agreeing with Loken, Paffell stresses the need for documentation.