Flow meters With increased precision

Flow Meters with Increased Precision

TPR GT provides commercial and technological metering for liquids with varying density and viscosity.

• TPR GT: range measurements 10:1.
• TPR GT cover wide range from 0.3 to 150 cSt.

Pressure Drop

Pressure drop in turbine converters consumption GT depends on the density of the measured liquid, its kinematic viscosity And current consumption. For calculation difference pressure the following is used formula:
P_back ≥ 2 × ΔP + 1.25 × P_v
Where:
ΔP = 25 × d × ν^0.2 × (Q / Q_max)²

The pressure drop across the flow meter is determined by:
Where:

• ΔP — pressure drop across the flow meter, kPa
• d — specific density
• ν — kinematic viscosity of the liquid, mm²/s (cSt)
• Q — actual flow rate, m³/h
• Q_max — maximum standardized flow rate of the flow meter, m³/h

Specific gravity is calculated as the ratio of the density of the working liquid (kg/m³) to the density of the reference substance (1000 kg/m³).

Back Pressure

For liquids other than liquefied gases, the minimum absolute back pressure is calculated from the inequality above to prevent cavitation.

• ΔP — pressure drop of the flow meter at maximum flow rate (including flow straightener)
• P_v — vapor pressure of the liquid at the measurement temperature