I have an outside above ground oil tank 90' from boiler. Tank is approx 9' above burner level. Have run 5/8" od line 18" underground to house. Using Beckett burner with solinoid shut off. Question: Do I need additional safety control on oil line such as an additional solinoid valve or PRV(?) valve to protect basement from oil flooding due to beckett solinoid failure? I guess seals in burner would need to fail also. Any insight? tks

There is a device called an "Oil Safety Valve (OSV)" that requires suction on it to open. The head pressure of the oil itself is not enogh to open it, so a broken line in the basement will not cause a flood. This should be available at your oil tank supplier. You might also consider a "fusible globe valve". This device shuts off the flow of fuel in the event of a fire. Both of these devices are fully mechanical.

If you are running a one pipe system, I would also recommend the use of an Oventrop "Tigerloop". This device removes any air that gets in the fuel, as well as helping to pre-heat the oil before it enters the burner. You are going to have VERY cold oil arriving from your tank with that large ID fuel line. You will have to convert the pump to a two-pipe system (install the plug supplied with the burner in the return port of the pump).

Jeff