Have a frame built for the table top out of angle iron with 2 pipe legs that fit into thise pipes with an angle brace to the other side.
The pipes are 2" od. Length between each is 8'. As mentioned current pipes extend up about 18", and would only expect the table needed to be about 40" off top of dock. Nothing too heavy will go on the table, I'd say may 40lbs. Most of time will be 10lb to 20lbs.If we knew the size and intended use we could enjinere you a PVC frame with PVC post that slipped over the present pipes and have a nice wood slatted top. Could be removed when not in use if desired.
EDIT: EDIT:
Consider measuring the actual od of your pipes and then better determine if 2" sch 40 pvc or sch 80 would better satisfy the pvc idea. And as said, just an idea. :biggrin2: I suspect sch 40 would be sufficient. It seems as if a 45° gusset wouldn't be too difficult to adapt for a brace from the top to the legs if necessary.The pipes are 2" od. Length between each is 8'. As mentioned current pipes extend up about 18", and would only expect the table needed to be about 40" off top of dock. Nothing too heavy will go on the table, I'd say may 40lbs. Most of time will be 10lb to 20lbs.