Rosemount™ 3418 Eight-Path Gas Ultrasonic Flow Meter
High-accuracy custody transfer 8-path meter with swirl immunity. Requires minimal straight run and no flow conditioner—ideal for compact installations.
Key Features
- Maintain custody transfer accuracy with minimal upstream piping and no flow conditioner using an eight-path design that compensates for swirl, asymmetry, and crossflow, reducing pressure loss, blockage risk, and maintenance requirements.
- Enable compact installations with as little as 5D upstream piping while maintaining OIML R137 Class 0.5 performance.
- Increase operational flexibility with >100:1 rangeability to support wide flow conditions with fewer meter runs.
- Simplify troubleshooting with Smart Meter Verification that converts diagnostic data into clear, actionable insights.
- Improve measurement confidence using multi-path diagnostics that detect changing flow profiles and process disturbances early.
- Minimize downtime with non-wetted transducers that can be serviced or replaced under pressure without special tools.
Frequently Asked Questions
The Rosemount™ 3418 Eight‑Path Gas Ultrasonic Flow Meter uses eight chordal measurement paths arranged symmetrically to capture complex velocity profiles and compensate for swirl, crossflow, and asymmetry, allowing it to achieve OIML R137 Class 0.5 accuracy with as little as 5D upstream piping and no flow conditioner in custody transfer applications.
The Rosemount™ 3418 is ideal for compact installations, bidirectional retrofits with limited straight run, where traditional meter designs cannot meet accuracy requirements without additional piping or flow conditioning.
Swirl immunity in the Rosemount™ 3418 reduces measurement error by canceling out non-axial velocity components through its multi-path geometry, ensuring stable and repeatable measurement even in disturbed flow conditions in transmission systems.
The Rosemount™ 3418 provides a single highly accurate measurement with improved disturbance immunity, whereas dual-meter configurations such as 4+4 designs provide independent redundancy, meaning selection depends on whether the application requires compact installation/no flow conditioner or independent validation.
The Rosemount™ 3418 reduces installation cost and complexity by eliminating the need for flow conditioners and minimizing straight-run requirements, while maintaining custody transfer accuracy, reducing piping, weight, footprint, and pressure drop in natural gas metering systems.