supporting fire pipes from z purlin. 3

I am not sure what a "gripple" wire is, but it does not sound like a listed attachment?

Any items touching the structure, or the pipe, in Fire Sprinkler applications must be listed.

Normally, if permitted by the Steel Manufacturer, some sort of "Sammy Screw", or other approved means is to be used.

I would strongly suggest checking with the provider of the steel for input on their allowed methods as well.

R/
Matt

you could try also hanging this way, either with an angle or a clip.

Sammy sidewinder or Sammy Xpress for Z purlins. I think your Gripple system is only listed in the UK.