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Acid flare system material selection

  • 1.  Acid flare system material selection

    Posted 05-01-2020 08:43 AM
    Dear all, 

    Regarding material selection of flare tip of acid flare system which flare gases from refinery SRU and acid gas removal unit, can you kindly advise the optimum material to be used. Also if any one has specified SS309. 

    Also, please advise if any valuable resources can be used while selection of materials for flare system in addition to API 537



  • 2.  RE: Acid flare system material selection

    Posted 05-05-2020 09:20 AM
    Ahmed,
    Thank you for visiting the MTI website. In my former role as a materials specialist for Rolled Alloys, we did see a range of alloys used for flare tips with 309 stainless being a base alloy.  Increasing nickel and/or chromium content in higher alloys will improve corrosion resistance and life expectancy.  Alloys such as 600, 625 and RA333 will offer higher levels of resistance to corrosion and high temperature.  They also cost more, but will generally return the investment in terms of life expectancy.

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    Paul Whitcraft Executive Director
    MTI
    NJ
    4193518637
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  • 3.  RE: Acid flare system material selection

    Posted 05-18-2020 07:44 AM
    Dear Eng. Paul

    Thank you for your kind feedback

    A.Eissa


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    Ahmed Eissa
    ENPPI
    Engineering
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  • 4.  RE: Acid flare system material selection

    Posted 05-05-2020 09:55 AM
    Ahmed

    Rolled Alloys has long supplied product into the flare tip industry.  As Paul has already suggested, stainless alloys 309 & 310 are common base materials used in many flares.  As the environment becomes more aggressive, higher amounts of nickel and chrome, and other alloying elements become necessary.

    RA330 is often used, for its good oxidation resistance, and moderate strength.  It also provides good results where thermal shock (or thermal fatigue) is a concern.

    For higher temperatures, customers tend to migrate toward alloy 600 or RA602CA.

    Higher alloyed materials, like RA333 provide better service where corrosive media are present, and/or conditions can range from oxidizing to reducing​

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    Richard Duncan
    Metallurgist, Technical Sales
    Rolled Alloys
    Gibsonia PA
    724 713 1917
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  • 5.  RE: Acid flare system material selection

    Posted 05-18-2020 07:46 AM
    Dear Eng. Richard 

    Thank you for your kind feedback

    A.Eissa


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    Ahmed Eissa
    ENPPI
    Engineering
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  • 6.  RE: Acid flare system material selection

    Posted 05-19-2020 08:35 AM
    In my previous technical life , I got this question many times and within the Haynes alloys  I suggested Haynes HR-120 and Haynes 556
    Among their interesting characteristics :  the mechanical properties , the corrosion resistance ( sulfidation , oxydation)
    Ad mentioned by Paul they are also more expensive but 309/310 , but they offer a longer lifetime and less shutdown for repair

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    Patrice Houlle
    European Associate Director
    MTI
    France
    +33689379247
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