Enviromentally Freindly Pickling SS

[HouseHark]

Hi,
We want to start pickling prefab pipe and pipe supports.

I know their are a lot of acid spray washes that are suitable but it is difficult to get rid of the waste.

I am looking at environmentally friendly methods.

Can someone knowledgeable give some product advice on this?

Materials will be SS316, Duplex, Super Duplex and maybe 6Mo.

 

[EdStainless]

To pickle?, no such thing.
If you are just looking for passivation (cleaning) then there are some options.
As long as you are not trying to remove scale or heat tints then look at passivation.
If you need to remove heat tint you are stuck.

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Plymouth Tube

 

[HouseHark]

Yes thats what I feared. Unfortunate.

Then I have a problem trying to design a work station in the back of our yard. We have an oil separator which I have been informed will catch the heavy metals / sludge but I have to neutralise that "#%#¤¤% acid!

Suggestions welcome...

 

[strider6]

try with these resuslts

http://www.corrosionist.com/search ...287511253103195:qmfpcvv02be&cof=FORID:11#1672

S

Corrosion Prevention & Corrosion Control

 

[AlchemistFinkelstein]

co2 bubbler

 

[HouseHark]

Is there an actual requirement that pre-fab 316 and duplex pipe needs to be pickled? Build specs like ASME V and B31.3.

I ask because I am considering ofering quick mechanical cleaning and maybe a light rust preventing coat as an alternative?

 

[EdStainless]

If you grind the welds and adjacent areas with clean flap wheels and then passivate you can get fairly good results.
The passivation will also help remove any iron on the surfaces from handling or touching steel.

The only time that clean welds are required are when you are working with a knowledgeable customer.

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Plymouth Tube

 

[MikeHalloran]

I don't think anyone has stressed this quite strongly enough yet: Heat tint is _not_ a cosmetic problem. If the metal is stressed, even just from stresses locked in at welding, heat tint will cause trouble. You have to get rid of it, and it doesn't rub off easy.



Mike Halloran
Pembroke Pines, FL, USA