User manual

Toolbox 32 User Manual 1.47d www.cse-semaphore.com/mykingfisher
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97
Ladder Logic - AGA-9 Steam Flow Calc
Calculates steam flow using the AGA-9 standard and the published tables of superheated steam density.
Requires driver AGA9.Dxx.
Volumetric steam flow is calculated using the formula:
Qv = K x sqrt(F) x sqrt(dP)
dP = differential pressure
F = steam density (from steam tables; function of T,P)
T = temperature
P = pressure
K = calculation constant = Fna x K' x Fra x Fm x Faa x F1 x D^2
Fna = units correction factor
K' = flow coefficient
Fra = Reynolds number correction
Fm = manometer correction factor
Faa = thermal expansion factor
Fl = gauge location factor
D = pipe diameter
Comment: A 12-character description.
Temperature (deg C): (Float) Steam temperature.
Pressure (kPa): (Float) Steam pressure.
Diff. Pressure (kPa): (Float) Differential steam pressure.
K (calculation constant): (Float) Calculation constant K (as detailed above).
Volumetric Steam Flow: (Float) AGA-9 volumetric steam flow (cubic metres/second).
Steam Density: (Float) AGA-9 calculated steam density (kg/cubic metre).
Status: (Local register) AGA-9 calculation status. The following channels are used: