| Dear Raj, I have a doubt, For example in a 10mm thickness job a defect of 5mm length X 3mm width noticed under 5mm depth, for repairing purpose the excavation will be more than the defective length ( approximate of 15mm length & depth 6mm X width 6mm),and also let us keep the total length of NDT completed as 250mm,at this condition what is the repair percentage. Do you will consider the defect area or excavated area, With regards, Balajirajajan.P -------Original Message------- Hi, 1) Percentage Repair Rate = Defective Length Repaired / Total length of NDT completed OR 2) Percentage Repair Rate = Number of joints Repaired / Total number of joints NDT completed Cheers! Rajasekhar On Dec 1, 4:38 pm, ahmed <Ah...@costaindas.ae> wrote: > Dear Friends, > > I Want to know that how to calculate repair percentage for various diameter > of pipes, any reference or Para available in Code. > > Best Regards, > > Shaikh Ahmed . k . > > QA/QC Engineer > > COSTAIN ABU DHABI COMPANY.W.L.L > > (A division of Costain Oil & Gas Process Limited, Manchester, UK) > P.O. Box no: 3069 > Abu Dhabi-Das Island > United Arab Emirates > * Email :ah...@costaindas.ae > > Mobile: +971-567090644 > * Tel: +971-2-6063850 (Ext:216) > > Please visit <http://www.costain.com/>www.costain.com -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents. |
Hi, You are correct, Minimum refers to the one cycle for which this part will expose until final work shop PWHT. hence mill test certificate shall include this. Max. SPWHT, refers to additional cycles of heat treatment that are reserved for future repairs during equipment lifetime. Again, these simulated no. Of cycles shall be specified in MTC. The idea is we need to make sure that steel mechanical properties are not compromised upon exposure to multiple repairs (i e 4 cycles in your case). One could say, if steel is subjected to 4 cycles and is ok, then it should by defacto be good for one cycle, yet, this is wrong assumption cause mechanical problems and microstructure of materials varies accordingly based on no. Of cycles for which material will expose. This is apparent in alloy steel and especially for impact test values as an example. In your case, this forged CS with properties before PWHT can be understood to be " as forged" condition (i.e. Wit...
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