Resolution and response time of
various corrosion monitoring techniques, reported for subsea oil and gas production
equipment:
Technique
Resolution
Response Time at 1 mpy corrosion rate
Response Time at 40 mpy corrosion rate
Electrochemical
1 µA
minutes
minutes
FSM™ (25 mm wall thickness)
0.025 mm
1 year
days
Electrical Resistance (0.25 mm sensor)
0.00025 mm
4 days
minutes
Ultrasonic Thickness Transducer (fixed)
0.1 mm
4 years
40 days
Weight Loss Coupon
1 mg
months
days
Reference:
M.W. Joosten, K.P. Fischer, R. Strommen, K.C. Lunden: "Internal
Corrosion Monitoring of Subsea Oil and Gas Production Equipment", Materials
Performance, April 1995, pp.44-48.
