Accutube Flow Calculator
Calculate flow rate from Ambit averaging pitot tube differential pressure readings
Probe & Pipe Selection
20T = Single mount (one side). 21T = Dual mount (braced both sides, higher flow capacity).
Differential Pressure
Sf
Use Sf = 1.00 for water. Adjust for other fluids or temperature corrections.
Flow Rate
Calculated Flow
β
L/min
β
US GPM
β
mΒ³/h
β
m/s
Y Coefficient
β
K Factor
β
Pipe ID
β
ΞP (inHg)
β
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Formula Reference
Ambit Y-Coefficient Formula:
Q (L/min) = Y Γ β(ΞP / Sf)
Where ΞP is in inches of mercury (inHg) and Y is the pre-calculated coefficient from Ambit flow charts.
Q (L/min) = Y Γ β(ΞP / Sf)
Where ΞP is in inches of mercury (inHg) and Y is the pre-calculated coefficient from Ambit flow charts.
Data from Ambit Instruments flow charts Rev 04 (Medium Steel) and Rev 3 (Schedule 40).
Standards Reference
AS 2941 β Fixed fire protection installations - Pumpset systems
AS 2419.1 β Fire hydrant installations
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