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HVTS

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Krausen

Krausen

Mechanical
Jan 1, 2013
270
Curious for those with any experience with High Velocity Thermal Spray (HVTS) of high alloys inside VIII-1 pressure vessels for corrosion resistance ... would the application of this (typically only 20 mils thick of Hastelloy C276, or similar corrosion-resistant alloy, as I understand) allow you to consider your vessel as a "clad vessel" now under VIII-1? In other words, is this HVTS material considered "integrally bonded" to the base metal like traditional roll-bond or explosion-bond cladding is?

 
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Does this process even recognized by ASME Codes? I haven't seen any reference to it. Quite interesting as the process is widely used and recognized by AWS and NFPA.
Just a precautionary note - if you are using it in a vessel under hydrogen or sour environment, you might have to qualify the procedure to keep the base metal and HAZ hardness within specified hardness requirement by the Code/NACE.

GDD
Canada
 
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Kinda sounds like something like tantaline. Could this HVTS be considered a coating, that is OK by code, but not (really) dealt with by code, from a strength/mechanical perspective? Just like coating the outside of a CS vessel?

Huub
- You never get what you expect, you only get what you inspect.
 
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Yes I have similar question on how ASME code is addressing HVTS. According to the vendor, there are no PWHT requirements to the base metal as a result of HAZ, since they process evidently does not generate any HAZs to the base metal. But does ASME recognize this too?

Tolerance is the virtue of the man without convictions -GK Chesterton
 
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What's the vessel base material and service? Do you have feed stream composition and design parameters?

GDD
Canada
 
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Why should ASME recognise it when it's technically the same as painting/coating?

Steve Jones
Corrosion Management Consultant


All answers are personal opinions only and are in no way connected with any employer.
 
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SJones said:
technically the same as painting/coating?
Click to expand...

I think that answers the question.

Huub
- You never get what you expect, you only get what you inspect.
 
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SJones said:
Why should ASME recognise it when it's technically the same as painting/coating?
Click to expand...

One reason is the hydrotest. If you treat HVTS as painting/coating, would you accept the application after the vessel has been hydro-ed? I would think not.
 
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If you could prove adequate bond strength you could possibly treat it as integral clad. Otherwise it's a liner or coating.

Regards

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand
 
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