Asking a question for a friend (elderly gentleman and neighbor) who had some recent pool work done. He had a new liner put in by a pool company. They left when the pool was filling with water. According to my friend, they told him to just turn on the pump when the water level got up to skimmer level and they would come back and check the liner later. However, they forgot to tell him they left the valves in the closed position. I'm not sure he even knew he had valves (he hires someone to care for his pool). He did what they told him to do and just flipped the switch. The pump ran for 10-15 minutes or so with no water before he turned it off. I think it actually ran longer. He called me over and I discovered the valves were cut off. I turned them on, primed the pump and it seem to run fine.
So, now he's worried about damage to his pump. He's also worried about damage to the plumbing (pulling on empty pipes, I guess). I told him the sch 40 pvc would not be hurt......I was not sure about the pump. I told him I would ask some pool experts.
Any opinions....thanks, jed