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Removal of glass coat
2

Removal of glass coat

Removal of glass coat

(OP)
Is some body know what is the right way to remove glass coat from the shaft? Shaft is 6" dia, 168" lg. Material - carbon steel.

Best regards
Yakov.

RE: Removal of glass coat

Is this a vitrified glass as in a glass lined reactor?

RE: Removal of glass coat

Chemical dissolve in hydrofloric acid bath, then neutralize and wash piece.

Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada

RE: Removal of glass coat

Sand or shot blasting.

RE: Removal of glass coat

Why wouldn't the HF eat the steel?

Cheers

Greg Locock

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.

RE: Removal of glass coat

It would, quickly.

Mike Halloran
Pembroke Pines, FL, USA

RE: Removal of glass coat

Bend the shaft.

Finish up with a hammer.

Mike Halloran
Pembroke Pines, FL, USA

RE: Removal of glass coat

What is the 'glass coat'? The exact meaning may have been lost in translation. It could be mill scale (which is fused ceramic - ie glass)if the shaft has come straight from the mill.

If so, impact with an air powered needle descaler is the normal way to clean it up.

RE: Removal of glass coat

Hard to say what the "glass coat" means.

I went with the conventional sense since glass is typically used over steel as a protective coat from highly corrosive acids.  For example, "glass lined" tanks for holding sulfuric acid.

Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada

RE: Removal of glass coat

I wondered about the HF acid and steel as well.  My thought was that HF acid will attack glass, but if it attacks steel much faster than glass, then by the time you got ALL the glass off, you'd have eaten pits in the steel where it first penetrated the glass.  Wondering if this technique has been tried, or was this just an idea?

RE: Removal of glass coat

Please don't advocate using hydrofluoric acid, whatever the glass really is. This stuff is bad enough in the lab, but on an industrial scale it's evil. This shaft is 14 foot long and weighs over 1/2 a ton. That's some bath, cockroach! You'll have gallons of HF slurping around, with fumes and splashes.

By the time you've found someone foolish enough to do it, and paid lip-service to the health, safety and environmental guys, you could have made 10 new shafts.

Look up what HF does to the human body if you get a drop on the skin. Not nice.

RE: Removal of glass coat

Can it be done with ultrasonic vibration ??

Clean and safe

Kind Regard,

Chris

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