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H₂S Measurement in Natural Gas Pipelines

H₂S Measurement in Natural Gas Pipelines

Continuous Hydrogen Sulfide Monitoring for Pipeline Gas Quality — H2S-625

Hydrogen sulfide is both toxic and corrosive, and pipeline gas quality specifications often limit H₂S to only a few parts per million, commonly around 4 ppm (approximately 0.25 grain per 100 standard cubic feet). Natural gas entering transmission pipelines from sour gas processing facilities or third-party suppliers must meet the receiving pipeline’s H₂S specifications before acceptance.

Цей / Ця / Це Southland Sensing H2S-625 Continuous Analyzer provides continuous hydrogen sulfide monitoring at pipeline receipt points, compressor stations, and interconnects, helping operators detect H₂S excursions, verify gas quality, and support compliance with applicable pipeline specifications.

  • Pipeline Quality Spec
  • Sour Gas Detection
  • Corrosion Prevention
  • Continuous Online Monitoring

Why H₂S Monitoring Matters

Beyond its acute toxicity to personnel, hydrogen sulfide can contribute to corrosion and sulfide stress cracking in pipeline steel, particularly in the presence of moisture and susceptible materials. These effects can compromise pipeline integrity and increase maintenance costs. Because pipeline gas quality specifications establish H₂S limits for custody transfer, continuous monitoring at receipt and interconnect points helps operators verify gas quality, detect off-specification gas, and support compliance with contractual requirements.

Where It's Used

  • Gas receipt and custody transfer points — confirming sour gas is treated before entering the pipeline
  • Compressor stations — protecting equipment and personnel from H2S exposure
  • Underground storage facilities — verifying withdrawal gas quality
  • Interstate pipeline interconnects — checking gas quality across ownership boundaries

Recommended Analyzer

H2S-625 Continuous H₂S Process Analyzer

The H2S-625 is a continuous online analyzer built to deliver stable, low-ppm hydrogen sulfide measurement in demanding pipeline and gas processing environments.

Installed at fixed monitoring points, the H2S-625 provides continuous output to plant control systems, enabling automatic alarms if H2S approaches pipeline specification limits.

  • Continuous Online Output
  • Low-ppm Detection
  • 4-20 mA / HART Output
  • Field-Proven Sensor

Основні характеристики

  • Range: low-ppm levels matched to pipeline quality specifications
  • Sensor technology: electrochemical sensor suited to continuous sour gas duty
  • Response Time: Rapid response to changes in H₂S concentration for timely detection of gas quality excursions at pipeline receipt points.
  • Output: 4-20 mA and Optional MODBUS RTU for SCADA/DCS integration
  • Enclosure: rugged, weatherproof housing for outdoor pipeline station use

Часті запитання

Natural gas pipeline specifications commonly limit hydrogen sulfide to approximately 4 ppm (0.25 grain per 100 standard cubic feet). Actual limits vary by pipeline operator and applicable gas quality requirements.

Continuous H₂S monitoring helps pipeline operators detect off-specification gas at receipt points and interconnects, protect downstream infrastructure, and verify compliance with contractual gas quality specifications.

The Southland Sensing H2S-625 can be installed at pipeline receipt points, interconnects, and other gas quality monitoring locations. Appropriate sample conditioning and analyzer configuration depend on the gas composition, operating pressure, and required measurement range.

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