What is a "horizontal vertical" pipe? It is easy make a horizontal pipe full, empty, or half full. Any plumber can explain how to do this. You can put a valve to regulate pressure, for example. See "partially full pipe flow calculator and equations:"
http://www.engineersedge.com/fluid_flow/partially_full_pipe_flow_calculation/partiallyfullpipeflow_calculation.htm You can add a dike to the end, or tilt it slightly so that it drains while one end stays half full. Or you can use gravity flow with the Manning formula to regulate fluid height: https://s3.amazonaws.com/suncam/npdocs/080.pdf More to the point, if it was impossible to have a half-full pipe, why would this flow meter manual warn against half-full pipes? For that matter, how do you know Rossi does not have an compressor injecting air into the system? The water goes out the room into his pretend customer site and comes back in another pipe. There could be a compressor in the other room. The only thing we know for sure about that other room is that no significant heat is produced in it. I.H. and others checked carefully with IR sensors and by other means. There is not 1 MW, or 100 kW. There is no more than ~15 kW. So obviously Rossi is lying about the 70-foot machine in there that consumes 1 MW. If he were injecting air, he would lie about that too. - Jed
