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PHASED ARRAY ULTRASONIC TESTING WORK PROCEDURE

This instruction provides guidelines to perform phased array ultrasonic inspection that normally required by project using ISONIC 2009/2010 Phased Array System.

SCOPE

This instruction is to describe requirements for performing phased array ultrasonic inspection of the material and full penetration welds accordance with ASME V and Code Case. This is to be used for detecting, locating and evaluating indication within the welds and heat affected zone using manual contact inspection technique.

QUALIFICATION

Personal shall be qualified and competence to carry out the task. Personnel performing Ultrasonic Examination in accordance with this procedure shall be qualified and certified with at least level II in Phased Array Ultrasound Testing.

RESPONSIBILTIES

The PAUT examiner shall be able to carry out the task as per the inspection guideline according to code or recommended practice.

DEFINITIONS

Phased array systems pulse and receive from multiple elements of an array. These elements are pulsed in such a way as to cause multiple beam components to combine with each other and form a single wave front traveling in the desired direction. Similarly, the receiver function combines the input from multiple elements into a single presentation.

Because phasing technology permits electronic beam shaping and steering, it is possible to generate a vast number of different ultrasonic beam profiles from a single probe assembly, and this beam steering can be dynamically programmed to create electronic scan

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REFERENCE/CALIBRATION BLOCK.

International Institute of Welding Ultrasonic Reference Block Type-I (IIW V1)
IOW Beam Profile Block
ASME Basic Calibration Blocks
1. For examination of circumferential and longitudinal welds in materials with contact surface curvatures greater than 20 inches in diameter, flat basic calibration blocks shall be used.
2. For materials with contact surface curvatures of 20 inches and less, in diameter, the basic calibration block shall be curved. A single curved basic calibration block may be used to calibrate the examination on contact surfaces in the range of curvature from 0.9 to 1.5 times the basic calibration block diameter.
3. Basic Calibration for piping shall be a section of pipe of the same nominal size and schedule.

QUALIFICATION BLOCK

1. Qualification block shall be completed for all thicknesses and material inspected in accordance with the requirements of project
2. Welds shall be manufactured with simulated flaws on the fusion faces of sizes as required by the code case, EDM notches may be utilized for top and bottom defects with a width of 0.2mm
3. A record of qualification block shall be, maintained and validation documents shall be submitted for client review and shall form part of the final documentation package
4. Blocks shall be deemed acceptable if the sample block shows defect ratios smaller or equal to those required in the ASME code case acceptance criteria.

PHASED ARRAY CALIBRATION

1. Calibration shall be performed from the surface of the calibration block which corresponds to the component surface to be examined.
2. System calibration shall include the complete ultrasonic examination system. System calibration instructions will be outlined in the specific Ultrasonic Technical Instruction Phased Array. Screen distance calibration shall be at least 1 and ½ veepaths for the minimum angle that will be used during the examination, unless otherwise specified.

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1. During scanning, only the gain may be adjusted. Adjustment of other controls shall require recalibration.
2. Focal Law Verification
  1. The transmission and reception of ultrasonic waves of a given angle of incidence is a function of time delays calculated by focal laws using the information provided to the phased array system. Verification that the input information is correct and that the phased array system is working properly must be checked.
  2. Select the Angle Cursor and adjust its position so that it displays A-scan information for the 40^o angle of refraction or the minimum angle that will be used in the Sector Scan.
  3. Using the 4-inch radius on the IIW block, peak the signal shown on the A scan display.

Note: Although