Working at height...

Hi. Something I’m very familiar with in my profession. The harness you’ve mentioned isn’t going to be suitable. Someone touched on it earlier too. If you had that on an attachment point other that away above you, it’s not suitable.
Have a look at “WAH fall factor”.
If you had it attached wrongly at a level that allowed you to actually fall and travel even a couple of metres, before it stopped you (remember to consider the travel the fall arrest includes too)...let me tell you, you’re ending up in hospital afterwards. Also worth knowing that if you fall only a tiny distance, then the fall arrest system will not see enough force to deploy on occasion. Resulting in a painful stop.
Lots to consider and much more involved, but basically you’d be after a work positioning type system, that doesn’t allow you to travel any significant distance, before stopping a fall.
 
Not sure this international drift is helping the op polish his topsides :)
I agree


A mobile access tower seems a far better prospect. Glancing at the internet suggests a small mobile tower would probably have a hire cost around £100 per week.
 
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