on the hydrotest occured leak on girth flange position.
below is detail,
D.P :10 bar
Hydrotest : 19.77bar
girth flagne : 316L, t150 X I.D900 X O.D1200 R.T.J type(with octagonal Sus gasket)
bolt : 1-1/8" Inconel 625 (bolt tighting performed 106 bar)
i'm not sure exactly why occured leak...