Guided Wave Testing
Guided Wave Testing (GWT) is a screening tool used to pinpoint areas of concern in various piping systems.
A form of Long-Range Ultrasonic Testing (LRUT), GWT can be used to quickly screen large sections of pipe with 100% coverage to determine any areas of change. It is typically used in industries such as oil and gas, petrochemical, and power generation as well as pipeline integrity. By locating areas of concern over long lengths of pipe, Guided Wave technology helps to prevent unnecessary labor, which in return reduces overall cost.
Premium Inspection & Testing operates multiple Guided Wave systems to cover a wide variety of inspection needs. The operating frequency range of the Eddyfi Teletest focus and GUL G4 mini is 20 to 100 kHz. The system’s use either torsional or flexural wave modes, depending on the job scope, to offer a long-distance inspection range, full pipe wall coverage, and focusing capabilities. Unlike many ultrasonic techniques that are only capable of detecting anomalies in the sensor’s immediate vicinity, LRUT (Long-range Ultrasonic Testing) achieves inspection distances on above ground pipe an average 200 ft. (100 ft. bidirectionally). This distance is dependent upon pipe conditions and other variables.
After areas of corrosion have been pinpointed and categorized, the portion of pipe presenting the indication is accessed so that other NDT methods, including conventional Ultrasonics, radiography, Pulsed Eddy current, phased array Ultrasonics, or other methods can be used to quantify the severity of the defect.
LRUT can be a beneficial addition to a corrosion management program, providing long-distance screening of conventional, buried, and through-wall pipes on various piping systems. Inspection can be performed on bare pipe as well as insulated (with minimal removal required) or coated pipe. By pinpointing areas of concern without requiring additional labor or crafts, Guided Wave technology can significantly reduce the operation cost of piping integrity programs.