Few more pictures added for ceiling Girder NDE area for reader's Knowledge.
Pictures shows the mounting of heating coil and thermocouples over the joints web and flanges.
Stress releiving Chart ( Typical ) only for a joint
Stress releiving Chart ( Typical ) only for a joint
Ceiling Girder NDE inspection contains two part one is Radiography and other Part is Ultrasonic
testing . The thickness of the is 32 mm in web and 115 mm in flanges. Radiography for such
heavy thickness is very difficult and only can be done by source of cobalt -60. Otherwise all
material up to 50 mm to 60 mm the source used is Iridium 92. To get cobalt -60 in India is
very difficult and also it needs stringent safety measure at site. Every where now the same is
avoided and Ultrasonic testing method has been adopted. Some places for surface defects Dye
penetration test has been carried out.
Once all the NDE testing is carried out and accepted by competent authority then other works
begin. Both side pin connection to be fitted after doing necessary blue matching. Temporary
platforms ,ladders hand railing were put. Some roof structure post was also welded on the top
of the Girder. All temporary supports are removed and girder will be ready for lifting . Crane
will be placed inside the cavity at appropriate radius .
Above picture shows the erection of ceiling Girder under progress .
It concludes the ceiling Girder portion of the structural erection . We will discuss bolting and
secondary grouting from next submission onwards.
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