Bert,
You will find that elevated piping can quite often look like new from the ground but the top of the pipe (which you cannot see) is severely corroded due to chemicals landing on the top of the pipe. This would not be a problem on an overland pipeline but any piping in and around refineries, petrochemical plants is susceptible to this problem,
Regards,
Shane
If intrinsic safety is not an issue, RF frequencies are not restricted, and scaffolding is not practical:
ASME would clasify anything outside of 24" and 30 degrees to be a remote examination. For a remote examination, it must meet the mimimum of detail as compared to what a direct examination would be. Qualification of that system is required by ASME.
For that, A trip to your local spy shop or auto parts reverse camera and a trip to the RC store is called for.
The basic camera gear and transmitter is around 6 ounces, so the remote helo needs to be capable of lifting that.
I've done this twice, the client was more than pleased that they got their examinations performed, allowing pinpoint placement of scaffolding to effect repairs with no wasted $$$
The gear paid for itself the first trip, the second trip was $$$, and the one upcoming will be $$$.
An option you may want to look at.