Joint Category and production impact test.

[sw007]

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.

 

[metengr]

sw007;

Questions;

(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)

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?

 

[sw007]

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.

 

[metengr]

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.

 

[SnTMan]

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

 

[sw007]

Thanks

metengr; SnTMan

 

[eliebl]

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