excess penetration

7/29/2019 Excess Penetration

1/5

DharmveerUnfollow

Is there any specific idea to have a call to accept or reject for excess

penetration for tubes through radiography film?

From radiograph we can see excess penetration but what to do to come to conclusion how

much excess penetration is acceptable. Where can we take this idea?

4 days ago

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Mohammad Hossein Rafiee S.,Jeffrey Blylike this

10 comments

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Mohammad Hossein Rafiee S. First of all it will come to the field experience of the

Interpreter. He/She has to compare the Excess penetration (EP) image with the visual

examination of that point any time its possible, this practice can help He/She a lot to

understand the seriousness of that projection and improve S/His imagination.

Also using an accurate Densitometer and compare the darkness of base metal (knownThickness) with density of EP can give some idea (very close to the fact). Although we all

know that RT is not revealing all information and its not possible to have exact height of the

EP any how.

I should remind that the height of EP is not the only factor for its seriousness; overlapping

and sharp angles of such EP also can be more concern than its height.

3 days ago Like

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2/5


Mohammad Hossein Rafiee S. As RT can not give the thickness measurement of EP; most

of the standards did not give acceptable and/or reject able size or dimension. I think this

should be explained and cleared in the project specification by agreement B/W Engineering

and QC managers.

3 days ago Like

Follow Doug

Doug Shoup If you can obtain a radiograph which places the excess penetration in the

sidewall, it's height can be measured. Otherwise, density comparison against workmanshipsamples with acceptable and rejectable penetration can be used.

2 days ago Like

Follow Khalid

Khalid Kisha normally the defect seriousness is depend on how much the defect is decrease

the thickness of tested sample and how much the defect will participate on stress rise when

load apply, for EP first reason is not apply (no materials loss, no thickness loss), second

reason is apply and it's depend on the angle and shape of EP more than it size and density in

radiograph, unfortunatly some acc/rej criteria only considered density of EP as reason for

reject / accp of radiographed part.
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3/5

2 days ago Like


Mohammad Hossein Rafiee S. I think above the reasons which Friends mentioned, EP is

serious when pig running the pipeline, also when pipe or piping is in service the fluid running

through can cause Heat in that point so corrosion crack under stress will be more likely.Thatis why I think, EP shall not be judged only by look and its size; needs engineering point of

view which shall be stated in the project Spec. if reference standard is not clear about it.

2 days ago Like

Follow Michael

Michael Dale toe angle is important

1 day ago Like

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4/5

Follow Leon

Leon Nentjes Why not use Digital or conventional onstream radiography, is very acurate to

size youre EP.

I don't know the dimentions of you're "tubes" but TOFD could also be a solution.

Maybe a Visual testing procedure is available? here you can find specs. for EP?

3 hours ago Like

Follow azhagiri

azhagiri ganesan Mr. Mohammad Hossein Rafiee S. am strongly agree your comments.

2 hours ago Like

1

Follow Adam

Adam Bingel As per most of the codes I work with, root conditions must be smooth and

continuous... Meaning anything sharp, irregular, or abrupt is rejectable, as it produces a

possible stress riser. Another thing to consider is that excessive root penetration creates

turbulance in the product (liquid/steam) on the downstream side of the weld immediately

adjacent to the toe of the weld, causing washout.

But, it still remains... Interpreting film is subjective (to the interpreter), not objective... Which

is why they call it "interpretation", as you are trying to visualize a 3D object shown in a 2D

image..

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ROMER FERRER Dear Dharmveer, when you have a big job and want to know when you

should repair the excess penetration is simple, take a shim of the same thickness is allowed

penetration excess and place it adjacent to the weld on the outside of the pipe , this will serve

as a reference point when you see the film density.
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excess penetration

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