This post is in 2 parts.
Part-1 we deal with the theory. The basic Hydrostatic equation and the Bernoulli’s equation.
I have used the customary US engineering units throughout. This is mostly because almost all texts these days have a detailed SI units treatment of these equations and very little or none in IP units.
This is a big disadvantage for young engineers joining the HVAC field. Hopefully this will help.
Building Hydronic Pressure Profile Part-1
Building Hydronic Pressure Profile Part-2