Nantong,
I do know the PED , IBR, Section 9, B31.1, B31.3 code, we are dealing with these every day, I do know our customer W.E understand a code not a same, I send them a WPS, 1 accepted , 1 doesn't , I only ask these basic questions, so I can learn from all other expert out there for opinion, and I want to make sure my understanding is correct, I encountered many errors from other professional Welding engineer when I checked their work. People understand the code or specification different way.... we need to help each other for opinion, knowledge ,if you do not want to help, just s..f up and let other do, and not look down other , I believe you do not know sh.. before you getting smart A....sorry for my language, I low myself to low level as you....because I am tire of your BS...and let this post end now.where are you in China, I will come and see you for a cup of green tea.
sisi