Turbine & RPD Flow Meters — High-Accuracy Mechanical Flow Measurement for Liquids & Gases

Flow measurement is the backbone of process accuracy, billing, custody transfer, blending, and energy management. For decades, Turbine Flow Meters and RPD (Rotary Positive Displacement) Flow Meters have remained the most trusted mechanical solutions for high-precision measurement in oil, gas, chemical, utility, and industrial applications.

NPK Industries brings to you globally recognized mechanical flow metering technologies:

🔵 Rockwin Turbine Flow Meters – high accuracy, high repeatability
🟢 Petro Fiorentini RPD Flow Meters – certified for gas custody transfer

Whether your application requires high-accuracy billing, fuel transfer, viscous liquid measurement, or natural gas metering, NPK offers complete supply, installation, commissioning, calibration, and lifecycle support.

What Is a Turbine Flow Meter? (Technical Overview)

A Turbine Flow Meter measures liquid or gas flow using a turbine rotor that spins proportionally to the fluid velocity.

Working Principle:

  1. Fluid enters the meter and strikes the turbine blades.

  2. Rotor speed increases with flow rate.

  3. A magnetic or pick-up sensor detects blade movement.

  4. Each rotation creates electrical pulses.

  5. Electronics convert pulse frequency → volumetric flow.

Frequency ∝ Flow Rate

Turbine meters are excellent for:

✔ Clean liquids
 ✔ Hydrocarbons
 ✔ Chemicals
 ✔ Gases with filtration
 ✔ Custody transfer applications

What Is an RPD Flow Meter? (Technical Overview)

An RPD (Rotary Positive Displacement) Flow Meter measures actual volumetric displacement using interlocking rotors.

Working Principle:
  1. Two figure-8 shaped rotors rotate as fluid/gas enters.

  2. Each rotation displaces a fixed volume.

  3. The meter counts these displacements.

  4. Output → accurate totalized volume.

One rotation = known volume → extremely precise.

RPD meters are used for gas billing, natural gas distribution, fuel, and high-accuracy custody transfer.