Corrosion detection technologies for pipelines?

[dkf]

Could anyone advise on additional corrosion detection technologies available for HC pipeline reliability program.
We are using visual inspection for external corrosion; ultrassonic pipe thickness periodic measurements on critical locations; pigging (ultrassonic and magnetic)for internal corrosion inspetion and two types of corrosion coupons. We perceive three other technologies ( Beta foil; ECN - electro chemical noise and EIS - electro chemical impedance spectroscopy ) that we do not have any experience with. Are ther any other tyechnologies available ?
TIA
dkf

 

[ijzer]

An other method would be the signature method ( FSM) .For info see :

http://www.corrocean.com