When accesible from the inside, like a flange to pipe weld, we would permit the repair therefrom prior to PWHT. We would have performed a dehydrogenation treatment prior to repair and initial RT..
Joint prep and excesive or thin root gap and land are common problems in field work, in which I am most familiar. Most of our clients only permitted one such repair and if unsuccessful, a complete cutout required. On all pipe < or = to 6" diameter, I required a complete cutout and reweld.
Yes the repair can be done. I have seen a number of such repairs been unsuccessful, finally requiring a complete cutout and reweld. You may have to make the repair area/length somewhat larger to effect a successful repair. I assume that you found the defect through RT before PWHT.
We used to hydrotest our transmission pipelines to a maximum pressure, due to elevation change, at 105% of the SMYS. In almost all cases the actual yield strength was never exceded. A long time ago, I reviewed the MTRs for well over 100 heats of X52 pipe purchased. All met X58 and the majority...
Since the X65 has its tensile properties thru Q&T and you are quenching during induction bending, stress relieve at a temp below 650C more like 600C would be recommended.
If you only stress relieve it may not meet X-65 anymore. You should ask the purchaser to specify the pbht to be used. I'm not sure you haven't reduced the yield strength of the X65 by the induction bend heating and cooling process. You need to do your homework by testing to determine...
As I recall, Pheonix water is somewhat high in chlorides. Some of the photos look like iron contamination from improper cleaning but only so much can be gleaned from the photos.
If you are refering to wire, it is most likely cold drawn and easily in the 1/2 hard or higher condition and a very high yield strength. It cannot readily be additionally cold formed.
It appears that your client is rooted in the distant past when A105 flanges were commonly used for X60 and lower strength grades because of availability. Ask the client for a waver and provide the reasons thereof.
It was not uncommon to repair small locations of lamination in heavy wall plate after 100% UT at the Mill. We always required MT or PT of prepared areas for welding and made repairs prior to joint welding. As an EPC company, we had a Heavy Wall Engineering specification for all vessels with a...
I'm with Ed on this. The procedures I wrote would never permit this. And apparently the welder's attempted correction was not effective. An NCR should be written with proposed repair specified including addressing technique/fixturing to produce the desired result.
If the root side is not penetrated through, the test fails. Why not qualify the procedure with plate/sheet? The welders must be qualified on pipe but not the WPS.
