BORE SCOPE TECHNOLOGY AND CONTROL.

Ian Mc math , ( 2005) emphasized that the bore scope technology is mostly applicable to open shafts,internal inspection of the engine ,and pipes. TOFD techniques - rapid volume system inspection -will detect characterized  and size inspection inherent forging flaws and axial bore cracking and radial circumferential cracking. Data could be analysed to give an accessment of the remaining life and could determine the effect of plant practice and plant propagation.The remaining rings, disc and shaft interface and rotor blade fixing may also be sucessfully examined using the specific application techniques.The retaining rings are inspected by the pulse echo (PE) and TOFD technques, depending on the particular design of the retaining rings.Automated tranducers are oriented to inspect the inner rings surface in both the radial, axial and circumferential directions. in area such as shrink fit where through transmission cause geometrical echoes,TOFD is particularised for effective benefit. Automated transducer specially designed by Veritec Sonomatic are used to test specific features such as bayonet fixings on fig-tree forms and internal changes of section. Rough surfaces and geometry far less than the others., because of the application of TOFD, which is much more forgiven on the surface condition, than pulse echo ultrasonics.The surface condition are seriously the effect of the transmission of the utrasonic energy into the test piece. The geometry is also more easily indentifiable with TOFD seriously, due to the full capturability of the technique. And the hard copy gray scale images generated,which gives visual identification of geometry, it minimizes false calls and is therefore extremely cost effective for inspecting large volume in a single- pass with no compromise on the quality. This reduces outage time allocated inspection and also increases achievable coverage. Dedicated software package enable defect profiles taken from sucessive inspections to be recorded and analyzed, to give extremely accurate measurement of crack growth rates. TOFD means Time of plight direction , which may be used as part of the defect assessment procédures, each inspection is designed to match requirement and specification ,(Ian.2005).