Rosemount™ 3416 4+2 Dual-Configuration Gas Ultrasonic Flow Meter: Wet Gas & Fiscal Sourcing Guide
Page Summary: The Rosemount™ 3416 Gas Ultrasonic Flow Meter features a revolutionary 4+2 dual-configuration that integrates a 4-path British Gas chordal fiscal meter with a 2-path reflective check meter in a single body. Engineered to tackle Lost and Unaccounted For (LAUF) gas, it incorporates a 90° vertical diagnostic path to detect bottom-of-pipe liquid dropout and a 30° path for wall buildup. Certified to OIML R137 Class 0.5 with ±0.1% accuracy, this sourcing guide provides engineering specifications, tech comparisons, selection decision trees, field sourcing checklists, and links to our comprehensive Industrial Flow Meter Selection & Procurement Guide.
🎯 Quick Answer: What Makes the Rosemount 3416 Essential for Wet Gas Pipelines?
The Rosemount™ 3416 is a 4+2 path dual-configuration gas ultrasonic flow meter designed for custody transfer where trace liquids or fouling threaten billing accuracy.
- Dual-Verification System: Combines a primary 4-path fiscal meter (±0.1% accuracy) with an internal 2-path reflective check meter to eliminate common-mode errors.
- Wet Gas Diagnostics: Features an exclusive 90° vertical acoustic path that pinpoints liquid condensation and solid debris at the pipe floor, stopping LAUF gas losses before they escalate.
- Fouling Prevention: Employs a 30° reflective wall path to measure pipeline contamination and hydrocarbon buildup in real time.
📘 Guide Overview: Navigation Hub
1. System Overview: Solving the Pipeline "Wet Gas" Challenge
Natural gas pipelines operating near hydrocarbon dew points often suffer from liquid hydrocarbon condensation, lube oil carryover, or water accumulation. In standard 4-path gas meters, liquid pooling at the pipe floor distorts acoustic signals, leading to severe measurement drift and costly Lost and Unaccounted For (LAUF) gas disputes.
The Rosemount™ 3416 resolves this industry pain point through an integrated, dual-body design:
- Redundant Dual-Configuration (4+2): Incorporates two independent meter calculations in a single compact spool—a 4-path chordal fiscal meter and a 2-path reflective check meter.
- Bottom-of-Pipe Liquid Detection: A 90° vertical diagnostic path fires straight through the bottom centerline, providing real-time alerts when liquid film or debris collects.
- 3D Profile Diagnostics with MeterLink™: Advanced signal processing calculates crossflow, swirl, and symmetry, giving engineers a clear view of internal pipe conditions without shutting down flow.
2. Technical Specifications Matrix
| Specification Field |
Rosemount™ 3416 Performance Value |
| Line Sizes |
DN100 to DN600 (4-inch to 24-inch nominal pipe sizes) |
| Fiscal Path Linearity (4-Path) |
±0.1% of reading over entire calibration range |
| Check Path Linearity (2-Path) |
±0.1% for flow velocities from 1.5 to 30.5 m/s (5 to 100 ft/s) |
| Metrology Certification |
OIML R137 Accuracy Class 0.5; Compliant with AGA Report No. 9 |
| Max Operating Pressure |
Up to 27,579 kPag (4,000 psig) / ASME Class 150 to 1500 |
| Process Operating Temp |
-50°C to +100°C (-58°F to +212°F) using T-22 or T-41 Transducers |
| Diagnostics Software |
Rosemount MeterLink™ with Smart Meter Verification (SMV) |
3. Technology Comparison Matrix
Compare the Rosemount 3416 against other technology options detailed in our Industrial Flow Meter Selection & Procurement Guide:
| Meter Type |
Path Architecture |
Liquid Dropout Sensitivity |
Redundancy Level |
| Rosemount™ 3416 |
4-Path Chordal + 2-Path Reflective |
Ultra-High (90° Vertical Path) |
Built-in Redundant Check |
| Standard 8-Path Gas Meter |
8-Path Dual-Plane Chordal |
Moderate (Focused on flow profile) |
Dual-Plane Flow Profiling |
| Wedge / DP Flow Meters |
Differential Pressure Element |
Poor (Liquid dams behind restriction) |
None |
4. Engineering Pros, Cons & Application Suitability
✅ Key Advantages (Pros)
- Two Meters in One Body: Eliminates the footprint and cost of adding a second meter run for verification.
- Liquid Early Warning: Detects fluid accumulation before it causes severe billing errors or damages downstream compressors.
- Zero Pressure Drop: Full-bore design maximizes throughput and cuts compression costs.
- Retractable Transducers: Extractable under line pressure for safe field replacement.
⚠️ Application Constraints (Cons)
- Orientation Sensitivity: Meter spool MUST be installed in the exact orientation specified so the vertical path sits at the bottom centerline.
- Heavy Liquid Limits: Designed for trace liquid dropout; extreme slugging (>5% liquid volume fraction) requires upstream separation.
5. Gas Flow Meter Selection Decision Tree
Refer to our Flow Meter Selection Guide or follow this decision logic:
Step 1: Is your gas process stream dry or prone to wet gas / liquid dropout?➔ If
100% Dry Gas & High Accuracy Needed ──► Browse
Ultrasonic Gas Meters Category.
➔ If
Prone to Condensation, Oil Carryover, or LAUF Risk ──►
Proceed to Step 2.
Step 2: Do contract terms require a secondary check meter for continuous verification?
➔ If Single Spool Solution Desired to Save Space & Capex ──► Proceed to Step 3.
Step 3: Line size between DN100 and DN600 (4" to 24")?
➔ YES ──► OPTIMAL MATCH: ROSEMOUNT™ 3416 4+2 DUAL METER ✅
6. Field Replacement & Sourcing Checklist
🛠️ Field Sourcing Tip for Replacing Legacy Meters:
When planning station upgrades, review the complete sourcing methodology in our Industrial Flow Meter Procurement Guide and verify these 5 site parameters:
- ☑️ 1. Flange Class & Face-to-Face Dimensions: Match pipe rating (ASME Class 150 to 1500 RF/RTJ).
- ☑️ 2. Transducer Model (T-21 / T-22 / T-41): Choose T-22 or T-41 for high pressures or wide operating temperature ranges.
- ☑️ 3. Protocol & Communication Interfaces: Confirm protocol support (Modbus RS485, Ethernet TCP/IP, HART, or Frequency) for flow computers.
- ☑️ 4. Hazardous Location Certifications: Verify local area codes (ATEX Zone 1, IECEx, Class I Div 1).
- ☑️ 5. Pressure & Temperature Transmitters: Complete the metering system by selecting matching devices from our Pressure Transmitters Category Collection.
7. Procurement & Field Maintenance FAQs
Q1: How does the Rosemount 3416 help reduce Lost and Unaccounted For (LAUF) gas?
A: The meter incorporates a dedicated 90° vertical diagnostic path that continuously monitors the bottom of the pipe. When liquid condensates or heavy oils pool along the bottom, the 3416 flags this instantly, enabling operators to correct flow calculations.
Q2: What is the primary advantage of the 4+2 dual-configuration?
A: It embeds two independent ultrasonic meters—a 4-path fiscal meter and a 2-path reflective check meter—into one single spool, saving footprint and cost.
Q3: Where can I find complete procurement guidelines for industrial flow instrumentation?
A: You can read our comprehensive technical manual on Industrial Flow Meter Guide: Types, Selection, Applications & Procurement, which covers expert selection criteria and procurement guidance for electromagnetic, Coriolis, vortex, and ultrasonic flow meters across water, steam, gas, oil, and chemical applications.
8. Knowledge Network: Category Hubs & Topic Graph
Build a connected instrumentation system by exploring our specialized product collection hubs and technical categories:
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