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Assessing the impact of LNG on pipeline distribution systems

As global gas supplies become increasingly diverse, the composition of gas supplied through local distribution company (LDC) networks is likewise becoming more diverse. Distribution system components and end-use equipment, which have been designed and operated over the past decades based on a more stable and well-defined gas composition, can experience changes in performance due to the variation.

GTI has 75 years of experience in the area of gas quality, interchangeability issues and concerns, constituents that cause corrosion issues and increase risk, and materials characterization and testing.

Materials Integrity and Interchangeability Testing
To address the changes in the composition of gas delivered through the LDC distribution network, GTI has performed testing and research to determine the impact of varying gas compositions on the pipeline infrastructure. Efforts focused on determining the anticipated variations in natural gas composition in the future; determining the infrastructure components and corresponding materials to be studied (including couplings, gasket seals, meter diaphragms, etc.); developing the necessary protocols for testing the identified components and materials under various gas compositions; and carrying out a systematic research and testing program to determine the effects of varying gas compositions in these materials and components.

Internal Corrosion Expertise
We have extensive experience performing assessments on the internal corrosion risk to steel natural gas pipelines.

  • Gas Phase: This includes contributions from major corrosive constituents in traditional natural gas and renewable gas including oxygen, carbon dioxide, hydrogen sulfide, chloride, sulfur compounds, and the like.
  • Liquid/Condensed Phase: Our knowledge base includes corrosion mechanism of steel pipes by constituents in condensed liquids, such as: sulfur, oxygen, carbon dioxide, hydrogen sulfide, chloride, etc. This includes the interaction of these components under various pipeline operating conditions.
  • Biological Corrosion: We have significant and cutting edge experience and technology related to identifying and quantifying microbially induced corrosion (MIC).
  • Body of Knowledge
    The relevant literature sources related to the saturated water content in sweet and sour natural gases has been compiled, and the saturated water content under various operating conditions using accredited water charts handbooks has been estimated.

    Corrosion Modeling and Computer Simulation
    We have expert abilities to perform computer simulations of a given set of operating conditions using Aspen HYSYS (Version 7.2) to predict the water dew point temperatures.

    Corrosion Risk Modeling, Assessment, and Management
    GTI can also create custom risk models for pipeline systems that rank which lines are most likely to exhibit corrosion and at what severity. This allows for optimal designs of preventative and mitigative strategies.

    Consulting and Technical Services:
    Put GTI technical services to the test. With a legacy of developing solutions for the natural gas industry – and state-of-the-art laboratories, test facilities, and equipment – we are your single source for the performance of both standardized and custom tests.
    Become a member of the Gas Quality Resource Center, a centralized resource for technical information and expertise related to gas quality issues and concerns, and help supplies of clean-burning natural gas reach the marketplace.

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