Non-Metallics

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The Non-Metallics Technical Community of Interest is a group of people (both AMPP members and nonmembers) who have come together for the purpose of furthering a common cause by sharing wisdom, knowledge, information, and/or data  for disseminating technology relative to the use of nonmetallic materials of construction as a means of corrosion control.

  • 1.  Exploring H₂S-Resistant Fiberglass Composite Pipes: Seeking Insights

    Posted 01-06-2025 10:55 AM

    Happy New Year, everyone!

    The challenge of handling fluids containing significant amounts of hydrogen sulfide (H₂S) has led me to explore the suitability of H₂S-resistant fiberglass composite pipes. These pipes need to meet stringent requirements to ensure they perform reliably in such harsh environments.

    From my literature review, it appears that epoxy, commonly used as the primary matrix material in fiberglass composites, exhibits inertness to H₂S-provided it is fully cured. However, I'm curious to know whether all epoxy grades share this resistance or if some are better suited for H₂S exposure than others. Additionally, I wonder if upgrading to more specialized or expensive resin systems might be necessary to enhance the pipe's resistance.

    I'd greatly appreciate your thoughts, experiences, or advice on this topic. Are there specific epoxy grades or alternative resins you'd recommend for applications with high H₂S exposure?

    Looking forward to your valuable insights!

    Thank you!



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    LEI ZHAO
    CNPC USA
    Houston TX
    +15157087835
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  • 2.  RE: Exploring H₂S-Resistant Fiberglass Composite Pipes: Seeking Insights

    Posted 01-16-2025 05:48 AM

    Hello Lei Zhao,

    What may proof to give you ready some interesting information concerning the degradation of epoxy, and the combination met hydrogen sulphide, can be found in: "Corrosion Resistance Tables: Metals, Nonmetals, Coatings, Mortars, Plastics, Elastomers, and Linings and Fabrics, Fifth Edition (4 Volume Set) (Corrosion Technology) by Philip A. Schweitzer P.E. (Editor)"

    In this book 7 different types of epoxies are evaluated in 4 different hydrogen sulphide based environments.

    Best Regards,

    Johan



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    Johan Vanbrabant
    Specialist Electrochemistry & Corrosion
    Bekaert
    Zwevegem Belgium
    +3256767143
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  • 3.  RE: Exploring H₂S-Resistant Fiberglass Composite Pipes: Seeking Insights

    Posted 01-17-2025 10:40 AM

    Lei,

    An FRP pipe made with an epoxy vinyl ester resin like DERAKANE Signia 411 resin will have excellent resistance to H2S and has been used for many years in this service.  There are several fabricators that can make this kind of pipe.  If you need additional information, you can e-mail or call me.



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    Michael Stevens
    Principal Scientist
    INEOS Composites
    Arrington TN
    +16142641545
    Michael.Stevens2@ineos.com
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    Original Message


  • 4.  RE: Exploring H₂S-Resistant Fiberglass Composite Pipes: Seeking Insights

    Posted 01-17-2025 10:41 AM

    Thank you very much for the information, Mr. Vanbrabant! According to this book, chemically resistant epoxy is rated for use at only around 90°C in dry H2S. However, the testing criteria and the specific grade used for these evaluations are unclear. It seems that epoxy may not be suitable for sour well applications, particularly in mid- to high-temperature wells. This is unfortunate news for coating and composite product providers.




    Original Message


  • 5.  RE: Exploring H₂S-Resistant Fiberglass Composite Pipes: Seeking Insights

    Posted 01-20-2025 01:04 AM

    Please keep in mind that 'epoxy' covers a relatively wide range of possible polymeric compositions on both chemical and physical level depending on the type and way of making.

    Interestingly the paper of: A. Al-Borno and M. Brown, "Comparative testing of 31 tank lining protective coatings", 
    CORROSION/2007, paper no. 07025 (Houston, TX: NACE, 2007), also investigated 8 epoxy linings in H2S environments. 



    ------------------------------
    Johan Vanbrabant
    Specialist Electrochemistry & Corrosion
    Bekaert
    Zwevegem Belgium
    +3256767143
    ------------------------------

    Original Message