3814 Oil Flow Meter – High-Accuracy Ultrasonic Liquid Hydrocarbon Measurement for Custody Transfer and Process Control
The Rosemount 3814 Oil Flow Meter is a high-accuracy ultrasonic flow measurement solution designed for liquid hydrocarbons. Engineered for custody transfer and critical process control, it delivers reliable performance with minimal maintenance. Its advanced ultrasonic technology ensures precise, repeatable readings across a wide range of operating conditions, making it ideal for applications in oil and gas production, refining, and transportation. With robust construction, digital integration capabilities, and compliance with international standards, the 3814 provides both operational efficiency and confidence in measurement integrity.
| Feature / Parameter |
Rosemount 3814 Ultrasonic |
Electromagnetic Flowmeter |
Turbine Flowmeter |
Coriolis Mass Flowmeter |
Vortex Flowmeter |
| Measurement Principle |
Transit-time ultrasonic, 4-path |
Voltage induced in conductive liquid |
Rotor speed proportional to velocity |
Direct mass flow via Coriolis effect |
Vortex shedding frequency |
| Accuracy |
±0.15% of measured value (liquids, custody transfer grade) |
±0.2–0.5% |
±0.5–1.0% |
±0.1% (very high) |
±0.75–1.0% |
| Pressure Loss |
None (full-bore, no obstruction) |
None (full-bore) |
Moderate (rotor obstruction) |
Moderate (tube restriction) |
Low to moderate |
| Rangeability (Turndown) |
Up to 400:1 |
100:1 |
10–20:1 |
200:1 |
20–30:1 |
| Fluid Type |
Liquid hydrocarbons, refined products, crude oil |
Conductive liquids only (e.g., water, slurry) |
Clean liquids, low viscosity |
Liquids & gases (multi-phase capable) |
Liquids, steam, gases |
| Pipe Size Range |
DN100–DN600 (4–24 in) |
DN10–DN3000 |
DN25–DN600 |
DN6–DN300 |
DN15–DN600 |
| Maintenance |
No moving parts, minimal maintenance |
Low |
High (wear on rotor/bearings) |
Low to moderate |
Low |
| Typical Applications |
Custody transfer, oil & gas, petrochemicals, refined products |
Water treatment, slurry, chemical |
Fuel, water distribution |
High-value fluids, chemical, pharma |
Steam, utilities, process control |
| Compliance |
API Chapter 5.8, OIML R117 |
ISO, IEC standards |
API, ISO |
OIML, API |
ISO, ASME |
Applications
The Rosemount 3814 Oil Flow Meter is engineered for precision measurement of liquid hydrocarbons across a wide range of industrial environments. Typical applications include:
- Custody Transfer ensures accurate and reliable flow measurement for fiscal metering and trade settlement in crude oil and refined product transactions.
- Pipeline Monitoring provides continuous, real-time flow data for transportation networks, enabling leak detection, flow balancing, and operational efficiency.
- Refining and Petrochemical Processes deliver high-accuracy measurement for process control in distillation, blending, and product distribution systems.
- Storage and Terminal Operations supports inventory management and loading/unloading operations with precise flow measurement for tanks and terminals.
- Upstream Oil & Gas Production Monitors production flow rates in gathering systems and offshore platforms, ensuring compliance and operational safety.
Frequently Asked Questions (FAQ)
Q1: What type of flow meter is the Rosemount 3814?
A1: The Rosemount 3814 is an ultrasonic oil flow meter designed for high-accuracy measurement of liquid hydrocarbons, particularly in custody transfer and process control applications.
Q2: What industries commonly use the 3814?
A2: It is widely used in oil and gas production, refining, petrochemical plants, pipeline transportation, and storage terminals where precise and reliable flow measurement is critical.
Q3: Can the 3814 handle custody transfer applications?
A3: Yes. The 3814 is engineered to meet international standards (API, OIML, ISO) for custody transfer, ensuring compliance and accuracy in fiscal metering.
Q4: What are the advantages of ultrasonic technology in oil flow measurement?
A4: Ultrasonic technology provides non-intrusive measurement, minimal pressure drop, no moving parts, and long-term stability, reducing maintenance and improving reliability.
Q5: What pipe sizes and flow ranges are supported?
A5: The 3814 supports a wide range of pipe diameters and flow capacities, making it suitable for both small-scale process lines and large-diameter pipelines.
Q6: How is the meter integrated into control systems?
A6: It offers digital communication protocols (such as Modbus, HART, or FOUNDATION Fieldbus) for seamless integration with distributed control systems (DCS) and supervisory systems.
Q7: What maintenance is required?
A7: With no moving parts, the 3814 requires minimal maintenance. Periodic calibration checks are recommended to ensure compliance with custody transfer applications.
Q8: Can it measure other liquids besides oil?
A8: While optimized for liquid hydrocarbons, the 3814 can also measure other clean, homogeneous liquids depending on process conditions.
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