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Trace Oxygen Verification for Pipeline Gas Quality & Custody Transfer — OMD-625

Natural gas pipeline tariffs and interconnect agreements establish oxygen limits to maintain gas quality, contractual compliance, and pipeline integrity. Oxygen can enter the gas stream through leaking seals, air ingress in low-pressure systems, vacuum-assisted operations, or blending points where gas from multiple sources is combined.

The Southland Sensing OMD-625 online trace oxygen analyzer provides continuous oxygen monitoring at pipeline receipt points, compressor stations, and interconnects, helping operators verify oxygen concentrations against applicable gas quality specifications before gas enters downstream pipeline systems.

  • Custody Transfer Quality
  • Pipeline Interconnects
  • Continuous Online Monitoring
  • Corrosion Prevention

Why Oxygen Monitoring Matters

Oxygen contamination in natural gas pipelines is both an operational and commercial concern. Elevated oxygen concentrations can contribute to internal corrosion in the presence of moisture, potentially affecting pipeline integrity over time. Pipeline gas quality specifications and custody transfer agreements often establish oxygen limits to protect infrastructure and maintain product quality. Continuous trace oxygen monitoring at key points helps operators detect oxygen ingress early, protect downstream equipment, and demonstrate compliance with contractual gas quality requirements.

Where It's Used

  • Custody transfer metering stations — verifying gas quality before ownership changes hands
  • Compressor station inlets and outlets — confirming no oxygen ingress across compression
  • Underground storage withdrawal points — monitoring gas quality as it re-enters the pipeline
  • Pipeline interconnects — checking blended gas from multiple supply sources

Recommended Analyzer

OMD-625
OMD-625 Trace Oxygen Process Analyzer

The OMD-625 is a continuous online trace oxygen analyzer built for demanding process environments, delivering stable, drift-resistant oxygen readings well into the ppm range for gas quality applications.

For pipeline applications, the OMD-625 mounts at fixed monitoring points and provides continuous 4-20 mA/HART output to plant control systems, allowing operators to trend oxygen levels and trigger alarms automatically if levels approach contractual limits.

  • Continuous Online Output
  • ppm-Level Trace Detection
  • 4-20 mA / HART Output
  • Rugged Process Enclosure

주요 사양

  • Measurement Range: 0–1,000 ppm O₂, with additional ranges available to accommodate varying natural gas pipeline oxygen specifications.
  • Response Time: Fast response to changes in oxygen concentration for timely detection of oxygen ingress at pipeline monitoring points.
  • Sensor technology: long-life trace oxygen sensor suited to continuous process duty
  • Output: 4-20 mA and Optional MODBUS RTU for direct integration with SCADA/DCS systems
  • Enclosure: NEMA-rated, suitable for outdoor pipeline station installation

자주 묻는 질문

Pipeline tariffs usually cap oxygen at a low percentage of gas volume, commonly somewhere between about 0.2% and 1% depending on the operator and region. Always check the specification in your own gas transportation agreement, since limits vary.

Calibration frequency depends on the sensor, the sample conditions and your quality procedures. A routine schedule with a certified span gas is normal practice, and the OMD-625 manual and Southland Sensing support can help set an interval for your site.

Yes. Continuous process analyzers like the OMD-625 are used for unattended monitoring, and the 4-20 mA output can be sent to the station RTU or SCADA so oxygen excursions are alarmed remotely.

NEED HELP SPECIFYING AN ANALYZER FOR YOUR OPERATION?

Our application engineers can help confirm the right model for your process conditions.

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