The PVC will burst at a higher pressure underground because it will be surrounded by dirt, which pushes back on it, unlike air.
Adapt steel to PVC at each end to come out of the ground, and run PVC underground only.
If it does break, it won't be going anywhere.
You might want to put a drip in the line ahead of your secondary tank. Just a T in the line with an adapter and a larger piece of pipe screwed into it, with a ball valve at the bottom of that. It will catch a lot of moisture and help save the tank.
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