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viral30786
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Join Date: Jul 2013
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How to Remove PTFE Coating from Inside the Pipe?

08/01/2013 3:27 AM

Pipe size is DN15 and its jacketed pipe.

inside 0.8mm coating by black PTFE that i wantto remove.

Can anybody help in this,
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Tornado
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#1

Re: How to remove PTFE coating from inside the pipe?

08/01/2013 4:53 AM

IIRC, hydrofluoric acid eats PTFE.

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viral30786
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#2
In reply to #1

Re: How to remove PTFE coating from inside the pipe?

08/01/2013 6:22 AM

What is the method for that. If i put that acid for some time then after some time it also corode the back mateial(SS316L)?
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PWSlack
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#9
In reply to #1

Re: How to remove PTFE coating from inside the pipe?

08/01/2013 3:37 PM

It eats practically everything else as well!

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Tornado
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#10
In reply to #9

Re: How to remove PTFE coating from inside the pipe?

08/01/2013 3:44 PM

Then he can start from scratch with the right pipe!

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TonyS
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#3

Re: How to remove PTFE coating from inside the pipe?

08/01/2013 7:31 AM

Buy a different type of pipe.

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ignator
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#4

Re: How to remove PTFE coating from inside the pipe?

08/01/2013 7:57 AM

I see you've made a duplicate thread on this.

Is the PTFE causing some sort of heat transfer problem? You indicated sterile usage. Is the heat exchanger a straight through bore? If so, how long is this?

We really need more information on what this jacketed heat exchanger is. Are you trying to remove the PTFE from the annulus part of the heat exchanger, or the inside center portion? If your trying to remove it from the center bore, and it's straight through, and less then ~2m, you can do this with a reamer and an extension rod. If serpentine, either burning it out, or chemical acid are your two options.

Explain just what and why you are wanting to remove the PTFE, and what the mechanical properties, and usage of the heat exchanger is for, could give better answers.

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viral30786
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#5
In reply to #4

Re: How to remove PTFE coating from inside the pipe?

08/01/2013 9:09 AM

Basically this jacketed pipe used in pharma industry. and it is heighly starile area. PTFE (Xylan ) color is black . So, FDA person not allow this black PTFE, So, Thats way i want to remove that part from inside the pipe. lenght of pipe is 500mm only there is also U band

0.4mm thk of coating


There is no heat transfer problem.
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viral30786
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#6
In reply to #5

Re: How to remove PTFE coating from inside the pipe?

08/01/2013 9:12 AM

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lyn
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#7

Re: How to Remove PTFE Coating from Inside the Pipe?

08/01/2013 9:19 AM

Bye the correct type of pipe for the application.

Obviously you are trying to use something that is not approved for the application.

You must have known this already.
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#8

Re: How to Remove PTFE Coating from Inside the Pipe?

08/01/2013 1:52 PM

If the FDA is involved in the inspection then ask them what the specs are. Should have been done before hand. Someone surely told you the pipe needs to be teflon lined just didn't give you the white specs. Now you want to remove the lining. It may also fail the inspection.

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ignator (1); lyn (1); ozzb (1); PWSlack (1); TonyS (1); Tornado (2); viral30786 (3)

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