Just a quick question regarding calculating the coverage runtime for difference id’s. On the od we ran passes with known intensity settings, to be able to determine the point at which >95% coverage was reached, from that we used the surface area & runtime to calculate the runtime for difference od’s, ie:

175mm dia @ 25mm/sec (coverage Check data) =

150mm dia @ 25 / 0.74 = 33mm / second.
200mm dia @ 25 / 1.30 = 19mm / second

My question is, would we be able to apply this philosophy to the id or would we use a different calculation? Would the formula differ if we were using 1, 2 and/or 3 orifice nozzles to achieve the said coverage?