FABRAP | ACADEMY BASIC TRAINING TRACER-PRINCIPE ASME … · 2021. 2. 17. · If a defect in a weld or connection is found , the ASME and en-13480 require that a follow-up examination

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BASIC TRAINING TRACER-PRINCIPE ASME B31.3

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TRACERS

Wat is a tracer? If a defect in a weld or connection is found , the ASME and en-13480 require that a follow-up examination should take place. This is to establish that in the already realised welding of a welder there is not yet such a derogation present and that this afwiijkng could be called as an incident be. A tracer is therefore a follow-up study. When by examination a defect is detected on a Weld which is welded on Date X there will be follow-up welds selected for examinaton which where welded before Date X. Step (a), Welding Acc, then to step (d)After to step (b) Then two follow-up welds are selected which been welded before date X and identical to the welds where the original defect was found. Usuallyis a weld that was welded by the same WPS (welding procedure). Step (b),Welding ACC, then to step (d) After to step (c) If again defects are detected in those two follow-up welds then again two follow-up Welds wil be selected and examined. Step (c) In step c, two welds will be selected. Are the welds ACC go to step (d). Are the welds NA the follow-up examination stops Step (d)-repair the defect welds. When after repair there are still defects then All welding which the welder has laid of the SAME WPS will be examined according to the standard method e.g. 10% Step (a). ( Step (e)(F).

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All defects must of course be repaired to be acceptable. This can be a very costly affair and can lead to an unacceptable delay in the project. More reason to investigate the performance of the Project welders as quickly as possible. The standard rule is that 10% per welder PER WPS should be examined. The shorter you stay with your NDT on the welder welds, the smaller the risk of major damage. It is adviseble to examine the first two welds of the welder for the first impression and then stay monitoring the welding performance in general. FABRAP has the tools and reports to keep this under control. Select TRACER Welding In Our project we discovered a defect, binding errors AT ISO 102 Weld 05. In the example, the weld has already been repaired, But in practice this is not allowed. Before repairing can be done, the follow-up examination must be completed and the total repair scope known . Explanation of the symbols.

The source of a tracer in the NDT Overview In our case that ISO 102 Weld 05

The source-weld in the Tracer search screen In our case that ISO 102 Weld 05

Search for follow-up Weld button Displays a list of possible welds if present.

Follow-up Result (ACC) The examinede Weld is acceptable

Follow-up Result (NA) The examined Weld is not acceptable.

Tracer is RESULT (NA) NDT Overview NDT Done result Not Acceptable

Our source Weld is ISO 102 Weld 05. (Create traces for step (a)) In The NDT overview The weld is marked with "Na" disagree and the white T source of Tracer.

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When we click the White T, the screen opens. The Orange section display’s the data of the Source Weld.

We now need to select two similar follow-up welds. FABRAP selects them at WPS level. FABRAP is therefore looking for welds, laid earlier than the Source Weld that is welded by the SAME WPS. So, the same material type and filler material material and also diameter and wall thickness range. We Click on the top + and FABRAP returns a list of possibilities.

ISO 102 Weld 05 is laid on 26-01-2019 and so now get all the welding of the same WPS < 26-01-2019 to see. AccidentallyAlliso 103, but it is already built into the installation so we get THE ISO here to be able to make an suitable choice for a NDT.

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This is ISO 103 and see directly that the welds from 01 are easiest to reach for THE NDT operator and if necessary, for carrying out a repair.

We Select ISO 103 Weld 01 by Double click on THE shown Weld ISO 103 Weld 01, and then save.

In the screen changes the "save symbol" in under Construction, the tracer is selected.

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ISO 103 has also been updated. On Weld 01 a NDT Request has now been created and the red T indicates that it is a TRACER read.

We will select the second TRACER read in the same way as described above.

We immediately see that ISO 103 is no longer on the Weld 01. After all, it is already being examined and can no longer be chosen.

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ISO 103 is updated again automatically . On Weld 02 is NDT requested and noted AS TRACER.

NDT Request 0003. (See Chapter 6 for details)

The text below is given via the option "Extra text on NDT Request".

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NDT has been executed on 04-02-2019 and the results are recieved.

Very annoying, we noticed another defect. About 10 mm deffect code (D). That will be again two Tracers! (Step (b)) We Process First these NDT reports. The NDT overview has been updated as below.

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ISO 103 is now also updated automatically.

Selecting TRACERS for ISO 103 Weld 02 (step (b)) We go to the NDT overview and click on the red T at "after" Weld 02 OF ISO 103. Screen appears.

We see now that the tracers of SOURCEWELD ISO 102 are read 05 – 103-01 Acc and 103-02 NA . And, that for the newly selected tracers ISO 103 Weld 02 The new BronWeld (indicated by the orange color) has become.

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We click on the + to select the traces.

ISO 103 is already built in and the welds are in the installation at best a nasty height. You will be needing a scaffold to reach Weld 08. But we also see welding of welder FR-110 at ISO 105, we will take a we look there.

SPOOL D Weld 12 and 13 is still in the workshop, is a manageable spool so We select the welding from this ISO .

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ISO 105 Welding 12 & 13 are selected.

ISO 105 has been updated automatically.

NDT Request 0004.

Ok now we will up-load all the NDT reports in FABRAP and Hardcopy. (See Chapter 06)

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The reports are recieved.

The welds are fortunately good, which is nice. Step (c) We can skip, go to (d): Repair. We will process the reports in FABRAP and save the reports to NDT Request 0004.

Step D, Repair all defects. Weld 05 of ISO 102 we had already repaired and is acceptable. We are now going to Repair Weld 2 OF ISO 103.

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Repairing the faulty welds. (Step (d)) We have a new Weld-letter printed out OF ISO 103 to take the repair into production. It is decided to have FR-110 perform the repair itself. It is 10 mm insufficient by welding on WELD 02 of ISO 103. The X-Ray is made and the result of the repair is recieved.

The weld is wrong, it has even gotten worse than it already was. That is to say that we have now ended up with welder FR-110 in step (e) And have to repair and examine the ISo 103 again , until the weld is acceptable . If the repair is wrong we go to step (f). In some cases this may also mean that new materials need to be purchased. Of welder FR-110, over his remaining welds 10% per WPS is to be examined. Fortunately , WELDER FR-110 has only made 11 welds and may still be limited damage.

Final remark. The welds that are subjected to follow-up examination do count in the percentage per welder per WPS.The investigations on the repairs do not count.

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FABRAP | ACADEMY BASIC TRAINING TRACER-PRINCIPE ASME … · 2021. 2. 17. · If a defect in a weld or connection is found , the ASME and en-13480 require that a follow-up examination