The horizontal sweep shall be adjusted for distance calibration to present the equivalent of at least two plate thicknesses on the display when the search unit applied to Face A as in Table -2. 5.0 Calibration 5.1 Calibration for Straight Beam Testing. The dimension of the search unit shall be such that the distance from the leading edge of the search unit to the index point shall not exceed 1in.
Maximum internal reflectors from each search unit shall be verified at a maximum time interval of 40 hours of instrument use. Transducers shall be capable of resolving the three reflections when it is positioned at F on IIW block (Refer Fig 9)Ĥ.3.2 Angle-Beam Search Units: Transducer dimension shall have width 5/8 inches to 1 inch, Height -5/8 inches to 13/16 inches. 4.3 Search Units: 4.3.1 Straight-beam (longitudinal wave) search unit: Transducers dimension shall have an active area of not less than 1/2 square inches (323 square millimeters) nor more than 1 square inch (645 square millimeters). 4.2 Couplant: The couplant used for Ultrasonic Examination can be Polycell glue, Oil, Grease, Glycerine, Ultragell or equivalent. The display shall be an "A" scan rectified video trace. The ultrasonic instrument shall be the pulse echo type instrument KRAUTKRAMER USN 50, USN 50L USM 20, USM 25, PANAMETRICS EPOCH IIIB, SONATEST SITESCAN 140 or equivalent suitable for use with transducers oscillating at frequencies between 1 and 6 megahertz. 4.0 UT Equipment and Accessories 4.1 Equipment Requirements.
All works shall be performed by Saudi Aramco approved technician and shall be in accordance with Saudi Aramco Specifications and Standards. Personnel performing ultrasonic examination must be qualified and certified in accordance with company’s written practice NDT/CERT/01 Rev-3, ANSI/ASNT CP-189, ASNT SNT-TC-1A. All interpretation of test result shall be done by a certified NDT Level – II technician. d.ĪWS D1.1- 2004 Eidtion ASNT SNT TC -1A – 2001 Edition ASNT/ANSI CP-189 – 2001 Edition NDT/CERT/01 Rev 3 – 2006 (NDT & CCS - Certification Manual)ģ.0 NDT Personnel Qualification Requirements The examination shall be performed by at least an UT Level II. ULTRASONIC EXAMINATION PROCEDURE Addendum – Iġ.0 Scope This Standard prescribes the method of Ultrasonic Testing of groove welds and HAZs between the thicknesses 5/16” to 8” (8mm to 200 mm) inclusive, when such testing is required as per American Welding Society Structural Welding Code – Steel AWS D1.1 – 2004 Edition for non-tubular connections. NDT & Corrosion Control Services, Dammam, Saudi Arabia
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