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Where is a reference / guidance for suitable timing for post weld nde - depending on various factors: thickness, low/high Hydrogen electrode, preheat / interpass temperatures etc etc ?

Would a number weld beads have any impact on it ?

This condition is the same - no RT can be done ... can you expand in more details please ? Why it was selected a PT ? (no carbon steel ? not practical to run MPI ?) " the start/stop portion at least 1" beyond each end: I did not get the sentence ...

LittleInch may I ask you what would you have specified as an NDT for 18" weld-neck flange weld to pipe (normal fluid service) ?

I ve gone through B31.3 Sections V and VI - for example 341.4.1 Examination — Normal Fluid Service: "At least 5% of circumferential butt and miter groove welds within each designated lot shall be subjected to random examination by radiography in accordance with para. 344.5 or by ultrasonic...

Littleinch ... please ... approaching you modestly.... To more narrow your direction ... paragraph chapter ....

Dear All, I have a dummy question .... What are the references for welding a weld neck flange to pipe - in terms to what NDT to be done and where and when? Root pas ? subsequent passes ? What is the NDE requirements depending of fluid service ? Code of construction is B31.3

Photos is scanned from B&W document ... the black stain is where is the pin-hole leak

Belzona 1111 for example ?

Yes it is connected to a valve .... What would be a difference - valve or another flange ?

Thank you LittleInch, I did some searching - some proposals were - wrap / clamp as temporary repairs ... but i am not sure whether the clamp / wraps will work in this case, since it is a weld (weld cap) and flange neck - therefore how tight the wrap or clamp will sit ... (what would you think...

Gents, What is a an option to repair 18" weld neck flange weld joint to pipe? There is a water seepage pin-hole in the weld. Temporary / permanent repairs options ?

GD2 Thank you very much some light is shed now onto this.... May I approach :) with another question ... how / whereto use Y=(d+2c)/(D+d+2c) defined in B31.3 Para 304.1 Straight Pipe, definition for Y when t>D/6? Or this Y in this case only to used in pressure determination ? Since knowing D...

My question (that i struggle with) still is - within B31.3: Between B31.3 Chapter IX ("High pressure" thickness formula 34 a) and B31.3 Chapter II Par 304.1.2 Straight Pipe Under Internal Pressure ("Not High Pressure" thickness formula 3a) .... as shown in PDF in my previous submission? Why...

Dear GD2, Formula from ASME Div VIII Mandatory appendix 1, Para 1-2 for Cylindrical shells is the same as B31.3 Chapter XI, K304.1.2 Straight Pipe Under Internal Pressure and that gives me the thinner value for thickness rather than "conventional" thickness formula from 304.1.2 Straight Pipe...

LittleInch, Could you please advise me you mention above - about the iteration and introducing Y=d/(D+d) when t> D/6 to where and how ?

Dear r6155, Thank you so much for your help.... i would have an additional question: - I did pipe thickness calculation using: B31.3 2022 304.1.2 Straight Pipe Under Internal Pressure (Chapter II _ Design) - "AMSE ordinary" formula and K304.1.2 Straight Pipe Under Internal Pressure (Chapter...

That's exactly what i don't understand Y=d/(D+d) If i know D - Outside Diameter and d-inside diameter then i know the thickness it means t=(D-d)/2 why would i need the formula for t = PD/2(SE+PY) and putting in there Y=d/(D+d) ?

???

Dear Gautam, Thank you for the reply .... let me ask you the following also: ASME B 31.1 - 2016 Table 104.1.2 (A) values for y: In notes it does address to the case when D/t<6 and gives a formula for y=d/(d+D)... Here i am confused - if i know d-internal diameter and D external diameter it...