Can anyone point me to a good source of information regading the effects of solar heating
on pipework?
I am reviewing an external piperack of some 300m long which is carrying all manner of tubes/pipes and ducts.

Due to the long length of the rack, a small delta t of the pipe work will result in worryingly large expansions.

Pipes include 14" duct(2mm wall)
and 4" shd 40 pipework.

Any advice is appreciated.