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1
Ultrasonic phased array technology
Feasibility study to determine the ‘gap
setting-X’ distance between the flange face
and the internal pipe
1
Phased array technology
Purpose of study
• To look at the use of ultrasonic phased array for inspection of Viking Johnson valve to determine the ‘GAP SETTING X’
• To ensure that the gap distance is between 25-50mm, as per Viking Johnson specification
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Pipe that sits
inside the flanged
adapter
Flanged
adapter as
per PDF
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Reason for inspection
• To measure the ‘GAP SETTING X’ shown on data sheet
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Phased Array Technology
Technique
• A phased array inspection was performed using a ‘sectorial’ scan with the probe being manually moved adjacent and parallel to the inspected object. The ultrasonic response from the reflector can be measured by the Phased array equipment (see above dimension reference: RA)
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Phased Array Technology
Phased array probe scanning calibration block –’RA’=50mm standoff to plate edge
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Phased Array Technology
Phased array probe scanning calibration block –’RA’=100mm standoff to plate edge
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Phased Array Technology
Phased array probe scanning calibration block –’RA’=150mm standoff to plate edge
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Phased Array Technology
Phased array probe deployment location on Viking Johnson valve ‘Inlet Main’ 104
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Distance from Phased Array probe to flange face = 142mm
Distance from Phased Array probe to pipe end (RA)=-119mm
Gap Setting ‘X’ = 23mm
Phased Array Technology
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Phased array probe deployment location on Viking Johnson valve ‘Inlet Main’ 105
Distance from Phased Array probe to flange face = 136mm
Distance from Phased Array probe to pipe end (RA)=-108mm
Gap Setting ‘X’ = 28mm
Phased Array Technology
• The ultrasonic phased array inspection technique was successfully
applied to the Viking Johnson valve to check the ‘gap setting X’
• The objective of this feasibility study was to assist in knowing the
actual gap setting ‘X’ before attempting to slide the pipe work into the
flange void ‘X’. Phased Array distance results above has made the
survey worthwhile
Conclusion
For further information on this technique or to discuss our variety of
inspections services please contact:
JAMES FISHER NDT
Unit 44, First Avenue,
Zone 2, Deeside Industrial Estate
CH5 2NU
T: +44 (0) 1244 520058
W: www.jfndt.co.uk
Contact us