Eddy Current Test Acceptance 1

[SnTMan]

Hello All, I need to specify eddy current testing on SA-249-304 tubing. I planned to specify E-213, but it apparently contains no acceptance criteria.

Is it necessary to specify acceptance criteria, and if so, what might be customarily used?

Does one of the other eddy current practices contain acceptance criteria, that I may use instead of E-213?

Thanks in advance,

Mike

 

[EdStainless]

The criteria are either in A249 or A1016 (the general spec). A rejection level is set using a standard with a drilled hole not to exceed 0.031" in diameter.
The E specs are just methods.

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[SnTMan]

Ed, thanks, I'll review and decide on one or the other. Maybe I should look at the tube quote too

Regards and thanks again,

Mike

 

[TubeSled]

Mike,
Also E309 is commonly used as an eddy test method, with either of the following defects as the referenced standard:
1-A transverse notch up to 12.5% of wall
2-A drilled hole (up to 3 holes)
3-A longitudinal notch up to 12.5% of wall.

-Tom

 

[EdStainless]

I have always preferred using a single drilled hole and require that it be run in four positions to verify calibration.
I also use holes rather than notches because it is easy to verify the size of the holes (I own some small pin gages). Notches have to EDM machined and the replicated to get measurements.

You don't need to specify an ET E spec. If you look at A249 it calls out A1016. And A1016 lists E309 and E426 as test methods.

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Rust never sleeps
Neither should your protection

http://www.trent-tube.com/contact/Tech_Assist.cfm

 

[sammyty]

EdStainless, excellent information here. i too am doing some eddy current testing, (rookie)
i am getting some conflicting information, spec e 309 says what it says about notches in the tubing and holes. i have been told by the eddy current maching manufacturer that if i have a second channel (absolute) on the machine i will have to mill a notch thru the tubing, e 309 says the notch is to be a percentage of the wall thickness...?? so which one is it?
Thank you, yes a269,a270 tubing

 

[EdStainless]

E309 is very general.
If you are going to run bot differential and absolute, you need to decide what you are looking for with the absolute channel. The tubing spec will tell you what to use for ref std in the diff test.
There are a number of ways to use the absolute channel, though I have always like using two differential channels at different frequencies in order to get a better picture of the indication types.

= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection

http://www.trent-tube.com/contact/Tech_Assist.cfm

 

[sammyty]

EdStainless
thanks again. per spec e309, the testing should be for wall thickness only. (correct me if i am wrong) so with the absolute test i would be looking for thin wall conditions.
so can i look for this condition with a thru notch or do i need a milled notch not all the way thru the tubing..??

 

[SnTMan]

Just to close my part of this I did look at the tube quote, of course there is nothing there, and re-read SA-249 which invokes SA-1016, which pretty much settles the issue. Thanks Ed and others.

Mike

 

[rmw]

SnTMan,

You must be hard up for some good reading; that's all I have to add.

rmw

 

[SnTMan]

rmw, that's what I get paid to do

 

[rmw]

I know you do; I hope you could see the tongue in my cheek. I've read SA-249 myself and don't recommend it to the casual reader. But then too, I had a payday involved when I did it.

rmw

 

[SnTMan]

"I know you do; I hope you could see the tongue in my cheek."

Be assured I did. BTW, I didn't mean to imply I read the WHOLE THING at one sitting, just what I needed

 

[sammyty]

Edstainless
does your company do its own mechanical tests on the tubing?
if so did you get these tests or procedures certified by someone?
thanx again for all your help