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Joint Category and production impact test.

Joint Category and production impact test.

Joint Category and production impact test.

(OP)
I have the following issues need your help:

(1) Is the circumferential seam of nozzle pipe to flange weld joint a Category B joint or Category C joint? I read ASME VIII Div.1 UW-3, looks like it is a Category C joint. Fig UW-3 confused me.

(2) If the vessel MDMT is -46 DegC, is production impact test required for the nozzle piping to nozzle piping welding (Category B joint per ASME VIII Div.1). Assume the nozzle pipe material is SA333-6 and thickness is 12.7 mm.

Please advise.

RE: Joint Category and production impact test.

sw007;

Questions;

Quote:

(1) Is the circumferential seam of nozzle pipe to flange weld joint a Category B joint or Category C joint? I read ASME VIII Div.1 UW-3, looks like it is a Category C joint. Fig UW-3 confused me.

Reply; Yes. Review UW-3 (c)

Quote:

2) If the vessel MDMT is -46 DegC, is production impact test required for the nozzle piping to nozzle piping welding (Category B joint per ASME VIII Div.1). Assume the nozzle pipe material is SA333-6 and thickness is 12.7 mm.

This question seems confusing. Are you asking if the nozzle butt weld that joins the nozzle to piping requires impact testing? Can you illustrate with a drawing?

 

RE: Joint Category and production impact test.

(OP)
metengr

Thanks for your comments.

Please see the attached drawings. Regarding Questions 2, we knew that production impact test is requird for the vessle. but I dont know if we need producion impact test on this kind of nozzle or not. I read UCS-67(d) and UG84(i), but I can not get the answer by myself.

RE: Joint Category and production impact test.

sw007;
Your drawing indicates these are C category nozzle weld joints.

Regarding the second question, look at Part UCS-66,  Note 2 (c) in Figure UCS-66. This will give you guidance  for pipe, fittings, forgings and tubing not listed in Curves C and D.  

RE: Joint Category and production impact test.

sw007, recommend you read UG-84 closely for EXTENT of production impacts required. You will find, for example, that Category C joints do not require production impacts.

You will further find that SA-333-6 and SA-420-6 materials are impact tested per the material specification and are generally exempt under UCS-66 to -55F or so.

Regards,

Mike

 

RE: Joint Category and production impact test.

(OP)
Thanks

metengr; SnTMan

RE: Joint Category and production impact test.

Look at UCS-67(a)(2) for an adequate exemption.

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