Hi Fran, here's a link I found with information on how to build the stand.
I honestly don't know if it would be strong enough.
Making a Hammock Stand with PVC
This link shows pictures of the steps and gives specific measurements.
I found this
Check that pin https://www.pinterest.com/pin/399764904428042747/
Here's a post that might help you - https://www.hunker.com/13405497/how-to-make-a-pvc-hammock-stand
Here is some info I found for you
Here is how to make one easily: https://www.youtube.com/watch?v=S2oOlXE5Ci8
Here is an idea for a portable one!
Hi Fran: You can, but I don't think it would be too sturdy.