Projects

Pudsey Test & Inspection - Projects

For over 30 years, Pudsey Test & Inspection Ltd have established a national and international reputation in the testing and inspection of materials for major projects.

Just some of the industry sectors we provide services for:

Gas pipe line inspection
Inspection of gas pipe-lines throughout the North of England

Marine and Submarine
Pipe-work for Marine and Submarine build and re-fit programmes.

Road foot-bridges
Inspection of structural steel-work of road foot-bridges both during construction and on-site.

Nuclear power plant
Vessels, Pipe work, Lifting equipment, Turbine shafts

NDT
NDT
Oil & Gas
Both on and off-shore installations inspecting critical welds, components and materials.

Sports Stadiums
Testing of structural steel-work for sports stadia, eg: Twickenham, Anfield, Murrayfield.

Wind Turbines
Structural welds on wind-turbine installation 17 units on Ovenden Moor Wind Farm.

Cranes & Structural steel
Testing of structural welds on cranes up to 250 tonnes.
If you would like to know about Pudsey Test & Inspection's capabilities then contact us today on 

01274 656 736

Improved Methods of Flaw Detection

Improved Methods of Flaw Detection in the Walls of Small-Diameter, Thin-Wall Seamless Tubes Using Ultrasonic Immersion Test Techniques
 
The problem:
Using the standard pulse-echo techniques of ultrasonic immersion testing for the detection of discontinuities in the walls of tubes for critical applications, difficulty may be experienced in the detection of certain types of discontinuities that do not provide a good reflector for the ultrasound. Unacceptable defects in the tube-wall may remain undetected, leading to potential in-service failure of the tube.
 
History:
Successful results had been obtained for some years in detection of such defects in thick-wall tubes of 16 mm OD and greater using focused immersion transducers in the pitch-catch technique. Jigs located in tube- follower units have been used to maintain the essential probe-to-tube relationship. Arithmetic processing of the received signal has been used to enhance discontinuity detection and to suppress signals from such effects as tube eccentricity.
 
New developments:
By careful control of the tube position and by positioning of the transducers in fixed manipulators, it has been possible to maintain the probe-to-tube relationship to a degree of precision sufficient for the application of the through-transmission technique to tube sizes in the OD range 6 mm to 15 mm. Re-positioning of the transducers to detect the smaller discontinuities encountered has been successfully achieved.
 
Future work:
Further work needs to be undertaken to develop applicable standards for the range of tube sizes to be tested. However, repeat-ability of set-up sensitivity achieved so far indicates that the technique is applicable to the testing of small diameter tubes for critical applications.
 
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