Page Summary: The Rosemount™ 3814 Liquid Ultrasonic Flow Meter is a fiscal-grade 4-path chordal flow meter designed for high-value liquid hydrocarbon custody transfer, crude oil allocation, and refined product pipeline metering. Fully compliant with API MPMS Chapter 5.8 and OIML R117 (Class 0.3), it achieves ±0.15% linearity across wide viscosity ranges with zero pressure drop. This comprehensive technical guide covers hardware specifications, technology comparison matrices, flow selection decision trees, site replacement checklists, procurement FAQs, and internal topical graph links for EPC contractors and instrumentation engineers.
The Rosemount™ 3814 is a high-precision 4-path chordal liquid ultrasonic flow meter engineered for fiscal custody transfer, refined product distribution, and crude oil pipeline measurement.
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In high-volume crude oil pipelines and refined fuel terminals, minor measurement errors cause massive financial disparities. Traditional mechanical meters (such as turbine or positive displacement meters) suffer from rapid bearing wear, pressure drop, and frequent recalibration demands when handling variable viscosity fluids.
The Rosemount™ 3814 Liquid Ultrasonic Flow Meter sets the benchmark for liquid fiscal measurement through advanced acoustic chordal technology:
Refer to the official technical parameters below for the Rosemount™ 3814 Series:
| Technical Parameter | Rosemount™ 3814 Specification Standard |
|---|---|
| Nominal Line Sizes | DN100 to DN600 (4-inch to 24-inch nominal pipe sizes) |
| Linearity (Fiscal Range) | ±0.15% (Velocity range 1.2 to 12.2 m/s); Optional ±0.20% for wide range |
| Repeatability | ±0.02% of reading across full operating envelope |
| Applicable Fluid Types | Crude Oil, Refined Fuels (Diesel, Gasoline, Jet A-1), Condensates, Light Hydrocarbons |
| Pressure Rating & Flanges | Up to 155 Bar (2,250 psig) / ASME Class 150, 300, 600, 900 (RF / RTJ) |
| Process Operating Temp | -50°C to +150°C (-58°F to +302°F) optional cryogenic/extended ranges |
| Transducer Architecture | Non-Wetted, Field-Replaceable under line pressure (Retractable options available) |
| Transmitter Housing & Approvals | ATEX, IECEx Class I Div 1 / Zone 1 Flameproof Explosion-Proof Enclosures |
Understand how the Rosemount 3814 compares against alternative liquid metering technologies:
| Flow Meter Type | Measuring Principle | Accuracy / Linearity | Pressure Drop & Wear Risk | Primary Application |
|---|---|---|---|---|
| Rosemount™ 3814 | 4-Path Acoustic Transit-Time | ±0.15% (Fiscal Grade) | Zero Pressure Drop / No Moving Parts | Crude Oil Custody Transfer, Refined Product Pipelines |
| Rosemount™ 3812 | 2-Path Transit-Time | ±0.30% to ±0.50% | Zero Pressure Drop / No Moving Parts | Intermediate allocation, industrial process liquid lines |
| Rosemount™ 9195 Wedge | Differential Pressure (DP) | ±0.50% to ±1.00% | Moderate Pressure Drop / Permanent Restriction | Heavy Slurries, High-Solid Residue, Bitumen lines |
| Legacy Turbine Meters | Mechanical Rotor Rotation | ±0.25% (When New) | High Pressure Drop / High Mechanical Wear | Clean light fuels (Requires frequent proving/rebuilds) |
Follow this engineering decision flow to verify if the Rosemount 3814 fits your liquid application requirements:
💡 Field Engineer Sourcing Tip (Replacing Turbine / PD Meters):
When upgrading a pipeline station from mechanical meters to the Rosemount 3814, explicitly check these 5 parameters to ensure seamless site commissioning:
A: The Rosemount 3814 delivers ±0.15% linearity fully compliant with API MPMS Chapter 5.8 and OIML R117 standards. Its full-bore spool design imposes zero pressure drop, preventing paraffin/wax precipitation and drastically reducing pipeline pumping energy costs.
A: Yes. The meter features non-wetted field-replaceable transducers that do not come into contact with process liquid, allowing live maintenance or sensor swaps without line depressurization or flow shutdown.
A: Engineers must verify: 1) Flange rating (ASME Class 150 to 900), 2) Lay-length / face-to-face dimensions, 3) Process fluid viscosity range, 4) Hazardous area approvals (Class I Div 1 / ATEX Zone 1), and 5) Flow computer digital interface protocols (Modbus RTU/TCP, HART, or Dual Pulse Outputs).
A: SMV runs automated internal health checks against original factory baselines. By verifying acoustic path gain and signal-to-noise ratios in real time, site operators can extend laboratory recalibration cycles and avoid unnecessary meter pulls.
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Our technical support engineers provide complete sizing verification, viscosity compensation calculations, and competitive pricing for EPC contractors and pipeline operators.
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