re: Setting a 4x4 fence post in concrete on top of 2" schedule 40 pvc pipe

quote:

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leaving 8" of soil/clay protecting pvc?

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If you are asking if that is enough to keep the concrete from damaging the PVC then yes. Keep in mind PVC is used in concrete all of the time when pouring slabs but only for drain lines. The only issue I see is if you need to make repairs to any of the PVC in the future.

I would consider setting the post with the foam fence post kits since it is easier to remove in the future if need be.