Tube to Tube sheet welds_Minimum Leak Path Measurement _REg.,
kcrtechnical
meisam shokri arfaei
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M.Shokri Arfaei
International Welding Engineer
RT, UT ASNT Level III
ERI-Metallurgy Lab. Manager
Tel: +98 21 66283693
Fax: +98 21 66283693
Mob.: +98 912 139 4023
Web: www.metallurgylab.com
Pieper QSI
Dear KCR,
Leak Path is defined as the shortest way in any direction on a macro/micro specimen between the inside of the tube and the gap between tube and tube-plate, see example below. The maximum value will be the thickness of the tubes wall thickness, but because of improper welding this can become less when weld thickness is not sufficient. As far as I know the minimum acceptable value should be specified by your customer and is not mentioned anywhere in ASME section I.
Through Weld A (green) the path is longer than the thickness of the tube wall t and therefore Leak Path will be t.
The thickness of Weld B (red) is smaller as the tube wall t, here the shortest dimension measured through the weld will be the Leak Path.
Hope this makes things clear for you.
Met vriendelijke groeten / Best Regards
Herman Pieper
Pieper Quality Support & Inspection
Phone: +31 (0)521 380083
Fax: +31 (0)84 7539225
Cell: +31 (0)6 51691215
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