On-site NDT Options

Good day! We have a situation in one of our end user site where we have installed valves (Carbon steel (Cast and forged) and Stainless steel material) and they are in service. (Removing from service is not an option) They need to be Non-destructively examined for volumetric cracks.Currently UT SW is being used. It has its limitation with lower size valves. Can someone suggest  a better and feasible onsite NDE option? 

Thank you
Venkatesh

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