Have you considered running some plastic conduit to protect the PEX in the ground? I bet you could run your electrical in the same conduit if you pulled the cable and PEX through together as you connect the sections of conduit. In my very rocky soil, I always put cable in conduit rather than risking direct burial. I haven"t had any buried electrical lines go bad yet and I think using conduit is worth the extra expense. Hard work to dig trenches here, and I don"t want to have to do them over.
I would also be worried about condensation in the buried air line. A fairly large pressure tank at the end of the buried line would be a good way of dealing with the condensation and giving a good way of draining it.
Before I did the installation, I would do some research with the manufacturer of the PEX to see what they think about using it for an air line long term. Almost everything I have ever heard about PEX is that it is a great choice for water lines. But I haven"t read much about using it for air lines. It sure seems easy to work with and isn"t THAT expensive. If you find out something, please let us know what you come up with. Good luck!
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