High Temperature

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The Chemical (High Temperature) 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 the performance of both metallic and nonmetallic materials in specific environments where sustained temperatures of 538 °C (1,000 °F) are encountered. Document experience with equipment and materials, disseminate information on life assessment techniques for solving industry problems.
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Corrosion Under Insulation

  • 1.  Corrosion Under Insulation

    Posted 03-29-2022 03:17 PM
    Hello fellow TCI members.  If anyone has any questions regarding the latest in thermal, acoustic or passive fire protection insulation systems, especially related to corrosion under insulation, please reach out and I'll be glad to share the information Johns Manville has.

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    Scott Sinclair
    Johns Manville
    Spartanburg SC
    +18286411544
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  • 2.  RE: Corrosion Under Insulation

    Posted 09-15-2022 09:52 AM
    Inorganic Zinc Paint is applied on a external surface of boiler, economizer and stack where maximum operating temperature is 227 C, Can thermal insulation be applied on external surface after inorganic zinc paint ?? Because as per NACE SPO 198 Clause 4.3.5 inorganic zinc paint can not be used of temperature range of 50 to 175 C.

    Please clarify.

    Regards,

    Shahroze Mustafa



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    Shahroze Mustafa
    Lahore
    +923054078003
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  • 3.  RE: Corrosion Under Insulation

    Posted 09-16-2022 03:38 PM
    Hello Shahroze,

    My apologies for the slow reply - I was checking with our product engineering team to be sure I provided correct information.  

    Regarding any compatibility issues between insulation and zinc paint, it would depend on the type of insulation and the specific paint being used.  With our calcium silicate or perlite insulation, there could be an issue with the slightly alkaline pH of these materials causing a reaction with the zinc if water penetrated the insulation system.  But again, it would depend on the specific paint being used.

    I am not familiar at the moment with why SP 0198 states that zinc paint should not be used in the temperature range of 50 to 175C.  I will need to look into this further before I could comment.

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    Scott Sinclair
    Johns Manville
    Spartanburg SC
    +18286411544
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  • 4.  RE: Corrosion Under Insulation

    Posted 09-18-2022 03:51 AM
    If operating temperature is above 175 then can inorganic silicate be used as per NACE SPO 198 Clause 4.3.5

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    Shahroze Mustafa
    Lahore
    +923054078003
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  • 5.  RE: Corrosion Under Insulation

    Posted 09-20-2022 05:28 AM

    We have Applied after sand blasting Primer Coat of Inorganic Zinc-Rich Silicate (Akzonobel Interzinc 22) and Top Coat of High Temperature Silicone (Akzonobel Intertherm 50) on Boiler Block Under Insulation. The Normal Operating Temperature of Boiler is remain 227°C. While the Max. Metal Temperature is 243 °C.

    During shut down of boiler this metal temperature goes down @ ambient  Temperature, and there may be Condensation on the external surface of Boiler under insulation; In this Scenario this applied coating system capable for resist to corrosion.

    Please share your expert opinion.




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    Shahroze Mustafa
    Lahore
    +923054078003
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  • 6.  RE: Corrosion Under Insulation

    Posted 09-23-2022 07:07 AM
    Shahroze - You may also want to reference section 6.1.2.2 of API RP583, Corrosion Under Insulation and Fireproofing, which states the following about calcium silicate insulation: "When exposed to water, the material has a pH of 9 to 10 and may be detrimental to alkyd or inorganic zinc coatings."  I believe you would need to check with the producer of the zinc coating to see if they have concerns in this regard.

    If your concern is more related to corrosion of the underlying substrate than degradation of the zinc coating, then Johns Manville's Thermo-1200 calcium silicate does contain a proprietary corrosion inhibiting package that is activated by water that might enter the insulation system and would provide added protection against CUI.

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    Scott Sinclair
    Johns Manville
    Spartanburg SC
    +18286411544
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  • 7.  RE: Corrosion Under Insulation

    Posted 12-12-2022 08:07 AM

       Hello My name is Kris Rivera. I am a new Level 1 Coatings Inspector. I work at an an oil refinery in Louisiana. Looking to see what is the best solution to my problem. 


       I am working on industrial vessels and piping that are live and in process. We will be cleaning and coating these substrates. The operating temperatures for these multiple substrates are between 175-400 degrees. We are unable to shut down these structures to work under ambient conditions. We will be performing all cleaning and coating under the current operating temperature ranges.


       I have the gauges and probe that can endure these temperatures for dry film thickness. I do not however have the proper gauge or probe that will be able to take anchor profile readings at these temperatures. I have reached out to Elcometer and Deflesko and they do not manufacture any probes that can operate under these extreme temperatures. These temperatures are too extreme for Testex Tape. The comparator would not be accurate enough for these situations.

       In your experience, what would be the best way/tool to use to measure anchor profile under these extreme temperatures? My email is Kris@KrisRivera.com. If you could point me in the right direction your time would be greatly appreciated!



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    Kristopher Rivera
    Chalmette LA
    +15859677484
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  • 8.  RE: Corrosion Under Insulation

    Posted 02-11-2023 12:09 PM

    Hello Kris, and thanks for asking "what would be the best way/tool to use to measure anchor profile under these extreme temperatures?   Sorry I did not notice your question much sooner.   Did you get a reply/response to your question?    If not, let us know, I will be happy to enlist thelp of our protective coating colleagues/SMEs.

    Regards, 

    Bill Valerioti



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    William L. (Bill) Valerioti
    Chair, Process Industries Technical Committee TC 07
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  • 9.  RE: Corrosion Under Insulation

    Posted 02-11-2023 12:45 PM

    Hello,

    Thank you for responding back to me. No, I have not gotten a response or any answers to my questions. I would definitely appreciate your help in educating me in the proper manner to get anchor profile readings under extreme high temperatures.

    Thank You Kindly,

    Kris Rivera 



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    Kris Rivera
    Rope Access Supervisor
    Level 1 Coating Inspector
    Acuren Inspection
    New Orleans, LA
    585-967-7484
    Kris@KrisRivera.com
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  • 10.  RE: Corrosion Under Insulation

    Posted 02-11-2023 02:53 PM
    Howdy Kris, thanks for the note.   Are you a member of AMPP TCI Atmospheric Coatings?, I reposted your note there.  If we don't get a response by Tuesday, I will reach out to my friend Lake Barrett with KTA-Tator tp get a response to your question.

    Have a safe and enjoyable weekend. 





  • 11.  RE: Corrosion Under Insulation

    Posted 02-11-2023 03:22 PM
    Hello Bill...I am not a member of AMPP TCI Atmospheric Coatings. I am very new to AMPP and all of the wonderful ways of connecting with other AMPP members. I appreciate the time and effort you are giving with me in this matter. Thank you