hello

[Hernan Arturo Castillo Mier]

We have metal dusting corrosion in two thermowells, downstream of Hydrogen reformer.

Any have experience about this problem?

Thermowells are Incolloy 800HT.  This is not the best metallurgy for this corrosion problem.

According to NACE, the better metallurgy is Alloy 699 XA.

We are looking for any factory that  produce thermowells using that metallurgy.

 

Thanks,

 

 

Hernán Castillo Mier

Senior Engineer

Reliability and integrity of Static equipments.

API 510 (33119)

Ecopetrol   Cartagena Refinery

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[atul khatri]

Hi Hernan,

Could you please give some more details ?

What is the temperature of your reformed gas ?

Are you sure it's because of metal dusting ?

What does your licencor says ?

Hope I can help you after your replies . 

Br,

Atul 

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[Dinesh Somwanshi]

Dear sir,

Metal dusting is common problem in reformer external walls as temp above 475 deg.

If really want to know the updates of mettallurgy, do it mettallography to know effect.

Thanks & regards

Dinesh

--

[atul khatri]

Dear Mr. Dinesh,

Limitizing the temperature above 475 deg c should not be the right approach.

There are so many  factors like Steam to  carbon ration ,carbon activity , temperature which decide the metal dusting of particular material. 

So each material has different temperature range for metal dusting.

@ Mr. Hernan : Something can be discussed after getting more details with you.

Best Regards,

Atul 

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CAELgRrX2MMomKKLJDNydse6mNnepi7qxsyhe4dGZFuZPHzLkRQ%40mail.gmail.com.

[Hernan Arturo Castillo Mier]

 

Thanks,

 

Temperature is about 1600°F

Thermowells are installed in a boiler downstream the reformer.

On the other hand, see the corrosion present in the bypass duct before the damper downstream the boiler.

 

Yes, its metal dusting.

Look at the pictures attached  (confidential)

 

 

De: material...@googlegroups.com [mailto:material...@googlegroups.com] En nombre de atul khatri
Enviado el: miércoles, 15 de abril de 2020 12:12 AM
Para: material...@googlegroups.com
Asunto: Re: [MW:30758] hello

 

Hi Hernan,

Could you please give some more details ?

What is the temperature of your reformed gas ?

Are you sure it's because of metal dusting ?

What does your licencor says ?

 

 

Hope I can help you after your replies . 

 

Br,

Atul 

 

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CACKOSeDXJNaA3cF2kwGmZTUtGw5cTqZtKOveC7Q2YW%3DgwVVVpg%40mail.gmail.com.

[Materials & Welding]

Subject changed, pl reply only to this thread

On Wednesday, April 15, 2020 at 10:50:12 AM UTC+5:30, ATUL KHATRI wrote:

Hi Hernan,

Could you please give some more details ?

What is the temperature of your reformed gas ?

Are you sure it's because of metal dusting ?

What does your licencor says ?

Hope I can help you after your replies . 

Br,

Atul 

[atul khatri]

Alloy 800 HT could not be the right material above 1560 deg F.

Normally metal dusting occurs in range of 1100-1350 deg F.

Choice of Alloy 699 , 601 or 602 CA could be right choice in this temperature range.

Could you please tell who is the process licencor pf reformer ?

Best Regards

Atul Khatri

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/BN6PR22MB089992F9D7E311A192F13B90DDDB0%40BN6PR22MB0899.namprd22.prod.outlook.com.