High pressure CO2 pipeline metal loss inspection 2

That depends on the line size and pigging facilities. There are many companies providing inspection services but have limitations on size.

With the amount of H2S you may have some HIC in the line pipe depending upon steel composition.

Companies like AEA Technology and OIS (Aberdeen) both in UK have Time of Flight Diffraction (TOFD) equipment that can be effectively used for your purpose.

You should be able to get their Contact details by searching usinf "GOOGLE"

Best of Luck

A good source of reference is also (a kind of trade association of pigging service companies).