The Rosemount 3814 is the industry leader for liquid custody transfer, offering exceptional rangeability and linearity for everything from refined products to heavy crude. Designed in accordance with API Chapter 5.8 and OIML R117, this four-path liquid ultrasonic flow meter minimizes measurement uncertainty through its full-bore design. By virtually eliminating pressure drop, it maintains the highest level of measurement integrity while reducing the energy costs associated with pumping.
Powered by the robust Rosemount 3810 Series Electronics, the 3814 provides real-time detection of upstream blockages and flow disturbances. Operators leverage MeterLink™ Software to monitor meter health, which allows for extended calibration cycles and lower OPEX. The platform’s non-wetted transducers are field-replaceable without process shutdown, and the new Type 4 CPU Module expands I/O capabilities with up to six frequency or digital outputs for seamless system integration.
| Feature | Specification Details |
| Line Sizes | DN100 to DN600 (4-in to 24-in) |
| Linearity | ±0.15% (1.2 to 12.2 m/s); ±0.20% (Optional wide range) |
| Uncertainty | <±0.027% (Meter Factor Uncertainty per API MPMS) |
| Fluid Type | Liquid (Crude Oil, Refined Fuels, Chemicals) |
| Operating Pressure | Up to 155 Bar (2,250 psig) |
| Temperature Range | -50°C to +150°C (-58°F to +302°F) optional |
| Calibration | ISO 17025 Certified Flow Laboratory |
| Transducers | Field-Replaceable, Non-Wetted |
The Rosemount 3814 is specifically engineered for high-value liquid applications where measurement uncertainty must be kept to an absolute minimum. When selecting this model, consider the viscosity of your fluid; the four-path chordal design provides excellent averaging of the flow profile, making it suitable for both light and heavy hydrocarbons. For applications requiring even higher redundancy in gas lines, the [Rosemount 3418 8-Path Gas Meter] is the industry counterpart, while the 3814 remains the gold standard for liquids.
To achieve the rated ±0.15% linearity, the Rosemount 3814 should be installed with appropriate upstream and downstream straight runs as per API recommendations. Its full-bore design means no internal moving parts, reducing the risk of cavitation. For systems requiring remote monitoring, the Type 4 CPU's expanded I/O allows the meter to communicate directly with flow computers. If your installation involves abrasive slurries rather than clean hydrocarbons, the [Rosemount 9195 Wedge Flow Meter] may be a more durable secondary option for those specific lines.
Maintenance is simplified via the 3810 Series Electronics' high-capacity archive logs, which track pressure, temperature, and diagnostics for auditing. Unlike traditional turbine meters, the 3814 has no moving parts, eliminating mechanical wear. We recommend using the Smart Meter Verification feature to baseline the meter Factor. If your site handles both gas and liquid, standardizing on the [Rosemount 3410 Electronics Platform] will streamline your spare parts inventory and technician training.
Q: Why is the Rosemount 3814 preferred for crude oil custody transfer?
A: The 3814 is engineered specifically for liquid hydrocarbons. Its four-path chordal design provides high-precision measurement (±0.15% linearity) that complies with API 5.8 and OIML R117 standards. Additionally, its full-bore design eliminates pressure drop, preventing wax buildup and reducing pumping costs.
Q: Can transducers be replaced without process interruption in the 3814?
A: Yes. The meter utilizes non-wetted transducers that do not contact the process fluid. This allows field technicians to replace sensors without depressurizing the line or shutting down the process, maximizing operational uptime.
Q: How does the Smart Meter Verification feature reduce OPEX?
A: Smart Meter Verification allows operators to perform in-situ health checks against the meter's original factory baseline. By verifying performance without pulling the meter for laboratory recalibration, companies can extend calibration cycles and reduce maintenance labor costs.
