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Do you know what type, and size of tank it is? It could be a fixed or floating roof. If it is the latter then there will be temporary columns inside to support the roof. The interior lighting is normally only ambient lighting to see your way around and inspectors would have their own lighting for close examinations. Also although the tanks are normally certified gas free they can be within a COMAH site and subject to DSEAR in the UK. I have had to leave my car keys at reception when being involved in carrying out these types of inspections as they are not certified for explosive atmospheres. I can envisage that reference points would need to be placed on the walls of the tank so that the photos/videos can be referenced to certain areas. That would then allow any areas of concern to be visually assessed or subject to some form of NDT which may require scaffolding.

I am very interested how you get on with this job so please keep us informed.