ASME VIII - Question - PWHT

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Hello!I would like to ask you about the UCS 56 table of ASME VIII division 1. This tables says the minimun holding time for postweld heat treatment.For some material, P4 for example, the table says as follows: Up to 2in, 1hr/in and 15 min minimum. This means that if I have 1 in, I would do a heat treatment of one hour, if I have 1/2 in it would be in half an hour, if I have 3/16 in, I would have to do it in a minimun time of 15 minutes, and so on. The same would happen for material thicknesses over 2 inches to 5 inches. And over 5 inches, the heat treatment would last 5 hours plus 15 minutes for additional inch. This means that if have 6 inches, it would last 5 hours and 15 minutes. So far so good. (or so I think).My problem is when I get to P9 or P10 materials. This is what the table says: "1 hr minimum, plus 15 min/in for thicknesses over 1 in."Ok. Let's see what I have:If I have 1/2" -> 1 hourIf I have 1" -> 1 hourIf I have 2" -> and here is my problem. Does the heat treatment should last 1 hour and 15 minutes? or 1 hour and 30 minutes? To clarify a little, what I need to know if the code means 1 hour and 15 minutes PER inch over 1": if i have 2" that's 1" + 1" (that's 15 minutes per inch=30 minutes). I'm doubting because for these material doesn't say "for each additiona inch", in which case this would be as easy as I wrote in the previous paragraph.I think I have accomplished to confuse you and me more than I was before, but still I hope you understand my doubt and can help me.Thanks
Reply:post this to eng-tips.com, and you'll likely get a faster answer.  There are forums for interpretation of welding codes.  This forum deals most often in practical welding questions.  The eng-tips forum tends more towards the technical type of question you asked here.Good luck.Benson's Mobile Welding - Dayton, OH metro area - AWS Certified Welding Inspector
Reply:sorry...would you mind pointing me in some direction?...I wouldn't know where to begin...thnaks...