OSHA does not specifically prohibit attaching to a crane. What is prohibited is the attachment of a person to a non-manual hoist. so, the non-moving parts of the crane might be okay if they can hold the weight.
The other alternatives are to use scaffold, handrails, lifelines, or even a boom lift (JLG) or scissor lift. You could even use a personnel basket attached to the crane.
There are lots of options, but you are going to get resistance because of the usual excuses (uncomfortable, inconvenient, time-consuming...) It helps to remember that excuses are just excuses, and none of them are defensible reasons to allow undue risk.
One of my favorite quotes when dealing with this is to tell the complaining party (especially if he is in management) "If you can explain it exactly that way on the witness stand, you might have a chance."
I'm getting a sense that you are suddenly thrust into an occupational safety role without any management backup. No matter what, do not let them make you a fall-guy (no pun intended).
Man, I wish you was here for a beer or two....
You are right, I am new to the industrial safety hat...and I'm trying to take it seriously. I have backup from my mgmt, but I am expected to also come up with the solutions. Right now, it is improving. I may not get all the fall protection fixes done this outage, but at least the thought process is moving.
I am working on the lifeline across the cavity for the crew standing on the head and insulation, etc. And we are going to have tie offs while the railing is down. I haven't solved the problem of unrigging the head, blocks, etc once they are up on the floor - >6', but nowhere to tie off.
Up till now, it has been an attitude of "we'll have a safety person watch and tell people when they get too close, and we'll be careful". Not the best culture, and I'm trying to change it. My mgr understands, but has little industrial experience, or in plant experience. So the craft supv have been able to weave a good story, of "we've always done it that way"
Onward through the fog...
