Under-calls: Damage not Detected
	• Insufficient sensitivity – Heavy oil products, coatings and sludge attenuate AE signals (compared to clean, product tanks). – Excessive noise may mask ‘real’ AE signals. – Some problems with linings (in bad condition). • Short Monitoring Time – AE data collected over 1 hour, some corrosion sites may not be active over that time span. • Complex acoustics – One or two dominant AE sources may mask weaker sources of AE activity.