[MW:1962] Diffference between ASMEsection1 and ASMEB31.1 for boiler piping

Hi,All   Question 1 : We have boiler piping drawing.It refers two code on one drawing.Note on ISO's are as follows. ASME Section1/ASMEB31.1 . So what is the difference between ASME Section 1 and ASMEB31,1?   Question 2 Some drawing also shows code break means some portion have ASME SECTON 1 requirement and Other portion have ASME B31.1 requirement.why?   Question 3. If both code have different requiremt than How about NDT.Is it same for Both code?   Question 4 On one drawing we have Socket weld joint and material is SA106C.Code is ASME section1/ASMEB31,1.will someone tell me what percentage of MT or PT required?

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