Equipment for performing weld overlay on nozzles smaller than 3 inches

• Jan 16, 2025

• #2

XL83NL

Mechanical

Mar 3, 2011

3,091

Ive once seen a demo of Polysoude where they (for a customer in the EU, perhaps NL) had to internally clad some small dia large length (say 6 mtrs?) pipe. Dont know the exact dimensions, but you may give them a try.

 

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Solution

• Jan 16, 2025

• Thread starter
• #3

FPPE

Mechanical

Mar 4, 2022

194

XL83NL, thank you very much, I'll contact them right away!

 

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• Jan 17, 2025

• #4

r6155

Mechanical

Jan 12, 2010

2,876

If the overlay is stainless steel why not use a solid stainless steel nozzle?

 

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• Jan 17, 2025

• Thread starter
• #5

FPPE

Mechanical

Mar 4, 2022

194

r6155,
Thank you for your reply.
If the solution were that simple (and luckily it isn’t), the number of engineers in this field would drop dramatically.

 

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• Jan 17, 2025

• Thread starter
• #6

FPPE

Mechanical

Mar 4, 2022

194

r6155, some of our clients have experienced problems for integral nozzles (for example in SS) welded directly on a CS shell internally cladded in SS, so simply they do not permit and you have to clad also the nozzle. Unfortunately this is mandatory.

 

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• Jan 17, 2025

• #7

Trestala

Mechanical

Feb 15, 2015

165

r6155 said:

If the overlay is stainless steel why not use a solid stainless steel nozzle?

Click to expand...

r6155 said:

What's difficult?
Be practical.

Click to expand...

Again @r6155, be productive and helpful when you comment rather than being dismissive.

Also, using solid SS alloys on CS+Clad vessels are prohibited by most Owners/Contractors due to thermal expansion difference which causes localized stresses. Those are only utilized on near ambient temperatures.

 

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• Jan 17, 2025

• Thread starter
• #8

FPPE

Mechanical

Mar 4, 2022

194

Trestala, exactly, thank you.

 

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• Jan 17, 2025

• #9

r6155

Mechanical

Jan 12, 2010

2,876

The use of corrosion resistant integral or weld metal overlay cladding or lining material of chromium‐alloy stainless steel with a chromium content of over 14% is not recommended for service metal temperatures above 800°F (425°C).

 

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• Jan 18, 2025

• #10

Krausen

Mechanical

Jan 1, 2013

285

The thermal expansion stresses btw CS base metal shell & a solid SS nozzle vary greatly depending on the nozzle size. In the case of smaller nozzles (<3"), these stresses are typically acceptable (depending on operating temp) & solid SS nozzles can be a practical & cheaper solution, even if it's seen an unconventional.

 

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• Jan 18, 2025

• #11

weldstan

Materials

Jun 24, 2011

2,774

The cladding requirement is often due to chloride stress corrosio cracking issues. In many other environments solid corrosion resisstant alloys may be used in clad vessels. In the past a number of vessel manufacturers created their own equipment to overlay pipe components 2" diameter. I also saw Polysoude demonstrate it"s AGTAW system on 2" diameter pipe sample.

 

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• Jan 20, 2025

• Thread starter
• #12

FPPE

Mechanical

Mar 4, 2022

194

Thank you all for the answers!

 

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