My suggestion is don't run an open line system. You want to keep it simple, reliable and accurate, build a manifold that goes to each of your tables, run a loop at each table with an air relief valve at the end of each row. I'd also have a shut off valve at the end of each row so you can flush your mainlines out. Then just run pressure compensating emitters, 2 per plants minimum with a 1/2 hp pump and a quality timer so you can dial in your feeds.
Is there any reason why you want to run open ended lines?