thicness confirmation

By weldChow Date 06-16-2009 14:17

Hi im a beginner...
sory for my broken english...i hope u understand

i have a question friend.. can we use 6" sch 80(thk 10.97) & 6" sch 120(thk 14.27) for welder qualification with TYK connection CJP groove weld (6GR).

thanks friend

By 803056

Date 06-16-2009 16:18

The simple answer is no. The difference in wall thickness must be at least 4.8 mm between the thinner wall (13 mm) and the thicker wall.

You can use 6 inch schedule 120 and schedule XX strong as one combination or you can use 8 inch schedule 120 and schedule XX strong for another combination. Clearly you can't use 6 inch and 8 inch together.

Best regards - Al

By weldChow Date 06-17-2009 14:51

thanks Al,

can we refer Part C Performance Qualification - 4.26 CJP Groove Welds for Tubular Connections & Figure 4.27 to suport your statement.

best regards - chow

By 803056

Date 06-17-2009 20:36

That's what I was looking at, but I did the conversion from Customary Units to SI, so my numbers may not be exactly those shown in the figure.

Best regards - Al