Root Gap & Root Face in Pipe Fit Up inspection

[sevak hiren]

Dear Experts,

Subject Material: CS/MS Pipes (Dia 2" To 10" x 8 to 10 mm thk) Fit up inspections (As Per ASME B 31.1),

In general WPS root gap is shown as 2 to 3 mm, but practically I have seen that root gap exceeds up to 5 mm in actual fit ups and still proper & full penetration weld is achieved with this much of root gap.

Also welder argues that the root gap is required up to 4 to 5 mm to minimize the contraction of joint after welding.

The same case is with root face that  in WPS root face is shown as around 1.6 mm, but practically I have seen that root face of 0.5 mm only or without root face in actual fit ups and still proper & full penetration weld is achieved.

Although the root gap & root face is a non essential variable as per section IX, but still can we reject the pipe fit ups of root gap of 5 mm & nil root face ?

Can anyone provide some good article / reading material regarding recommendations for pipe fit ups with type of joints & dimensions ?

I need your valuable replies.............

[Dindo]

one thing is you could read through the QC Manual of the manufacturer. Different manufacturer have different fit up configuration.

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[Tariq Hussain]

You should not reject joint with below mentioned configuration, Specially for pipes welded with GTAW Root. Root Gap of 4 to 5mm and root face of 0.8mm to 0mm is ideal for Piping with GTAW root.