--Greetings,I hope youre into power generations, where you touch, boilers, power and process...Find my reply below in green, rest acceptable..( As per my knowledge 1) PWHT temperature for ASME P number 04 material is different from ASME B31.3 (process) : range 704-746°C to ASME B31.1 (Power) : range 650-700°C.)Reply: I have 2016, 31.3 vs 12, 31.1, which does not has this major difference for P no 4, to be precise (.3) comes with 650 to 705, where as (.1) with 650 to 700, which is acceptable. there are other P nos which has more than 5 Deg variations, which is not your case.Below I have given some WPS parameters for PWHT, please clarify me whether the parameters are correct or Not.According to B31.3 -Material : ASTM A 335 P11 to ASTM A 335 P11 - ( PNo-4; G.No-1 to PNo-4; G.No-1 )Process : GTAWTest coupon Thickness : 19.05 mmReply: why do you go with full GTAW for 19.05??PWHT- Temp range - 690°C- 705°CReply: 690 is okHeating range : 200°C/hrCooling range : 200°C/hrInterpass temp : 315°CPost Heating : 300°C -350°C ; holding thickness 10mm to 20mm -30 min / 20mm to 30mm - 90min.Reply: i made something like this and approved, A minimum of 25% of the groove weld is filled, the weldment is sufficiently supported with Post heating gradually increasing as per the WPS requirement 400 deg C at 2 hours after the welding completion, the bottom line is started after 25% with gradual fullfilled post heating after weld completion for continous 2 hours at 400 deg C.And regarding Backing - PQR is qualified with Argon, can we use Nitrogen in WPS.Reply: read QW-408.2.YoursMOHAMED MUNEEB MAHABOOB+91-786-700-444-6 TRZ - INDIA''The first man landed on earth has reference still today - so anything you do in your life check for reference, if you dont find then what you are doing is wrong, try to find''
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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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