Brodie International – Precision Positive Displacement Flow Measurement
Brodie International is a manufacturer of high-accuracy positive displacement (PD) flow measurement systems designed for custody transfer, pipeline metering, and industrial liquid control applications where measurement uncertainty directly impacts financial and regulatory outcomes.
Their technology is widely deployed in petroleum, terminal, and bulk liquid handling systems where repeatability, calibration integrity, and long-term mechanical stability are critical.
Core Measurement Technology
Positive Displacement Flow Meters
Brodie PD meters operate by mechanically isolating and measuring fixed liquid volumes as they pass through the measuring chamber.
Typical operating data:
- Line sizes: 1/2” to 16”
- Flow range: ~0.9 GPM to 13,000+ BPH (depending on model)
- Accuracy: up to ±0.10% to ±0.15% linearity (model dependent)
- Repeatability: as tight as ±0.02%
- Turndown ratio: up to 1000:1 on select configurations
- Pressure ratings: ANSI 150 / 300 / 600 classes
These meters are commonly used in custody transfer environments, where even small measurement deviations can result in significant financial variance over time.
Key Engineering Features
BiRotor Positive Displacement Design
Many Brodie meters use a twin helical rotor configuration that provides:
- Continuous, non-pulsing volumetric measurement
- No metal-to-metal contact in the measuring chamber
- Minimal wear under high-duty-cycle operation
- Stable meter factor over extended service intervals
Operating characteristics:
- Viscosity range capability: ~0.2 to 1000 cSt (model dependent)
- Low sensitivity to viscosity changes compared to turbine systems
- Improved performance in waxy or heavy hydrocarbon service
Flow Output & Instrumentation
Brodie meters typically support:
- Pulse output (frequency proportional to flow)
- Mechanical register or electronic totalization
- High-resolution pulse wheels for custody transfer verification
Signal characteristics:
- High-frequency pulse output suitable for provers and PLC systems
- Stable K-factor under defined flow conditions
- Designed for integration with SCADA and batch control systems
Proving & Calibration Systems
Compact Prover Systems
Brodie’s Compact Prover systems are used to verify meter accuracy in live process conditions without interrupting flow.
Typical prover process data:
- Repeatability: up to ±0.02%
- Flow range: up to ~25,000 BPH (model dependent)
- Operation: single or multi-pass proving cycles
- Standards compliance: API MPMS Chapter 4
System features:
- Piston-driven proving chamber with optical position sensing
- Pneumatic or hydraulic actuation depending on configuration
- Automatic pulse interpolation for high-resolution measurement
- Designed for inline proving without bypass interruption
Typical Process Applications
Brodie systems are commonly used in:
- Pipeline custody transfer (crude oil and refined products)
- Terminal loading racks and distribution systems
- Ship, barge, and truck loading/unloading
- Refinery blending and batching systems
- Calibration laboratories and metrology facilities
Process Design Considerations
Brodie systems are typically selected for applications requiring:
- High fiscal accuracy (≤0.1% uncertainty targets)
- Stable operation over varying flow conditions
- Compatibility with hydrocarbon service fluids
- Long calibration intervals with minimal drift
- Compliance with custody transfer standards
Summary
Brodie International systems are engineered around mechanical volumetric accuracy and calibration traceability, making them a benchmark solution in custody transfer and fiscal measurement applications where measurement integrity is critical.