The "rated load pressure" of 2.57 psi is the pressure that the test pump was operated at to determine the other ratings...air volume (4.2 CFM), power consumption (100 W @ 60 Hz), & noise level (42 dBA). This can be verified by looking at the flow curve and seeing that at 2.57 psi, the flow is 4.2 CFM. Actually, their numbers and curve do not match up perfectly, but they are close. The "Max Cont. Operating Pressure" of 4.35 psi is the highest pressure that the manufacturer suggests running the pump. Unfortunately they do not supply power consumption or noise level curves.
At a Max Cont. Operating Pressure of 4.35 psi...the pump will be louder, flow less air, and use more power than at the rated load pressure of 2.57. EDIT: It turns out the pump uses less electricity as pressure rises see below post.
That is how I interpret their pump data. I think we are all saying close to the same thing, however. The only problem one might have is to assume that the power consumption (100 W @ 60 Hz) and noise level (42 dBA) ratings are for when the pump is operating at its Max Cont. Operating Pressure.
Last edited by Quarter Acre; 03/29/21 02:33 PM.
