Dynamic Response Spectroscopy (DRS) Ultrasonic corrosion mapping through Stopaq Wrappingband New DRS Corrosion Mapping
Conventional Ultrasonic Corrosion Mapping
10 MHz
steel thickness
• Arrival times of reflected signals are used to calculate steel thickness at each location: thickness = (sound speed) x (reflection time / 2)
• Thickness accuracy requires high frequency ultrasound, which can’t penetrate Stopaq Wrappingband
reflection amplitude →
• Custom DRS probe travels over Stopaq Wrappingband constructing a map of steel thickness
• Conventional ultrasonic probe travels across steel surface constructing a thickness map
conventional probe
reflected signals
custom DRS probe
frequency response
Stopaq Wrappingband
.me →
• Steel responds, vibrating at natural frequencies related to its thickness
DRS Corrosion Map
Proven Deployment Tools Subsea ROV-iT
steel pipe
• Using advanced algorithms, these frequencies are extracted from the returning signal at each location and used to determine the steel thickness
→ Conven onal corrosion mapping is not possible through Stopaq Wrappingband
Subsea Nautilus
• Probe excites steel with a range of low ultrasonic frequencies, which pass easily through Stopaq Wrappingband
• Stopaq Wrappingband on steel plate with flat bottomed holes in underside
Topside Nautilus
actual thickness
• DRS thickness accuracy: 0.5 mm • Technique developed by Sonomatic
For further information or to request a demonstration please contact Alison Craigon: alison.craigon@sonomatic.com
DRS map
→ Subsea and topside inspections to begin later this year using proven deployment tools