3051SFA Flow Meter Hydrant | High-Accuracy Annubar Differential Pressure Flow Measurement for Fire Protection & Water Supply Systems

The Rosemount 3051SFA Annubar Flow Meter is a high-performance differential pressure device designed for accurate and reliable flow measurement in large-diameter water pipelines. Engineered with Annubar averaging pitot tube technology, it delivers precise flow monitoring for hydrant and fire protection systems with minimal permanent pressure loss. Its robust construction, wide flow range, and advanced transmitter integration make it ideal for municipal water supply networks, firefighting hydrant testing, and other critical infrastructure applications. With multiple communication protocols and long-term stability, the 3051SFA ensures dependable performance and reduced maintenance in demanding environments.

Typical Applications of Rosemount 3051SFA

1. Fire Protection & Hydrant Systems

• Used to monitor water flow in hydrant mains and sprinkler supply lines.
• Ensures adequate pressure and flow during fire emergencies.
• Provides real-time verification of hydrant testing and system readiness.

2. Municipal Water Supply Networks

• Installed in large-diameter pipelines for city water distribution.
• Tracks flow balance and leakage detection across districts.
• Supports regulatory compliance and monitors system efficiency.

3. Industrial Utility Systems

• Applied in cooling water loops, boiler feedwater, and process water lines.
• Monitors steam and compressed air in utility distribution networks.
• Helps optimize energy efficiency and reduce operating costs.

4. Oil, Gas & Chemical Plants

• Measures liquid hydrocarbons, steam, and process gases.
• Provides multi-fluid compatibility with one device.
• Withstands harsh environments due to the robust Annubar design.

5. Power Generation

• Used in steam flow measurement for turbine efficiency monitoring.
• Tracks condensate and feedwater flows in thermal plants.
• Ensures safety and reliability in high-pressure systems.

Why It Fits Hydrant Applications

• Minimal permanent pressure loss → critical for hydrant systems where pressure must be preserved.
• Wide pipe size coverage (2–96 in / 50–2400 mm) → suitable for municipal and fire mains.
• Multi-protocol communication (HART, WirelessHART, Fieldbus) → integrates easily with SCADA and fire monitoring systems.
• Long-term stability and low maintenance → essential for safety-critical infrastructure.

FAQ – Rosemount 3051SFA Flow Meter Hydrant

1. What is the Rosemount 3051SFA Flow Meter Hydrant?

The Rosemount 3051SFA is a high-accuracy Annubar differential pressure flow meter designed for large-diameter pipelines. It is widely used in fire protection hydrant systems, municipal water supply, and industrial utilities.

2. How does the 3051SFA measure flow?

It uses the Annubar averaging pitot tube principle, creating a differential pressure signal proportional to flow rate. This allows accurate measurement with minimal permanent pressure loss.

3. What are the typical applications?

• Fire protection & hydrant testing
• Municipal water distribution networks
• Industrial steam, gas, and liquid pipelines
• Power generation utility monitoring

4. What pipe sizes can it handle?

The 3051SFA is suitable for 2–96 inch (50–2400 mm) pipelines, making it ideal for large-scale infrastructure.

5. What is the accuracy level?

Typical accuracy is ±0.75% of flow rate, with advanced compensation options available for higher precision.

6. What communication protocols are supported?

It supports 4–20 mA, HART, WirelessHART, and FOUNDATION Fieldbus, ensuring easy integration with SCADA and DCS systems.

7. What are the advantages compared to other flow meters?

• Low pressure loss due to streamlined Annubar design
• Multi-fluid capability (liquids, gases, steam)
• Robust construction for harsh environments
• Low maintenance with no moving parts

8. Is it suitable for hydrant flow testing?

Yes. The 3051SFA provides reliable hydrant flow monitoring in fire protection systems, ensuring system readiness and compliance.

9. How does it compare to an electromagnetic flow meter?

• 3051SFA Annubar: versatile, works with steam/gas/liquid, very low pressure loss.
• Electromagnetic flow meter: higher accuracy for water-only applications, but limited to conductive fluids.

10. What certifications are available?

The 3051SFA is available with global approvals for safety, hazardous locations, and industry standards, depending on configuration.