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Flowrate Measurement Uncertainty Calculations - At discrete operating conditions
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Reference
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Notes
Piping Data
Nominal Size
DN
NPS
Schedule
Wall Thickness
mm
in
Piping specification not known yet
Flow Element Data
Type
Square Edge Orifice Plate
Conical Enterance Orifice Plate
Quarter-circle Orifice Plate
Eccentric Orifice Plate
ISA 1932 Nozzle
Long Raduis Nozzle (Low Ratio)
Long Raduis Nozzle (High Ratio)
Throat Tapped Nozzle
Venturi Nozzle
Venturi Tube
Cone Meter
Wedge Meter
Orifice / Throat / Cone
Bore Diameter
(d)
mm
in
Diameter Ratio
(β)
Fabrication Tolerances (95% Confidence Level)
Pipe Diameter Tolerance
(δD/D)
%
Orifice Diameter Tolerance
(δd/d)
%
Flow Transmitter Data
Span
bar
kPa
psi
Upper Range Limit
(URL)
bar
kPa
psi
Coverage Factor
(k)
Reference Accuracy
% of span +
% of URL
Ambient Temperature Effect
% of span +
% of URL
Line Pressure Effect - Zero Error
% of URL
bar a
kPa a
psi a
Line Pressure Effect - Span Error
% of reading /
bar a
kPa a
psi a
Piping Arrangement
Consider additional 0.5% uncertainty
Process Data
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Known Properties
Liquid Flowrate
Gas Flowrate
Gas Flowrate + Density
Case
Upstream Pressure
(p
1
)
bar a
bar g
kPa a
kPa g
psi a
psi g
Density
(ρ)
kg/m³
lb/ft³
lb/in³
Dynamic Viscosity
Kinematic Viscosity
(μ)
cP
Pa.s
Mass Flowrate
Volumetric Flowrate
(q
m
)
kg/h
kg/s
lb/h
lb/s
Calculatation
Calculate
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