Equipment for performing weld overlay on nozzles smaller than 3 inches

[FPPE]

Hi everyone,

Could you recommend a machine for performing internal weld overlay on nozzles with a diameter of 3 inches and below (e.g., a 2" LWN #300, which has an internal diameter of about 50 mm)?

We routinely perform weld overlay on heat exchangers, vessels, etc., but we do not have the appropriate equipment for small-diameter nozzles.

Thanks in advance for the answers!

 

[XL83NL]

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.

 

[FPPE]

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

 

[r6155]

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

 

[FPPE]

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.

 

[r6155]

@ FPPE
I've done this several times for small nozzles and it's very easy.
What's difficult?
Be practical.

 

[FPPE]

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.

 

[Trestala]

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

What's difficult?
Be practical.

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.

 

[FPPE]

Trestala, exactly, thank you.

 

[r6155]

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).