certification will not be considered qualified to pass judgement on the
acceptability of inspected items, but may work under the direct supervision
of a qualified ultrasonic inspector. Qualified ultrasonic inspectors shall
be able to judge the acceptability of the item in accordance with paragraph
ACCEPTANCE/REJECTION LIMITS.
1.8.2
Examinations
If the Contracting Officer doubts an individual's ability as an operator,
inspector, or supervisor, the individual shall be recertified in accordance
with ASNT RP SNT-TC-1A. At the option of the Government, the Contracting
Officer may participate in administering the examination and in evaluating
the results.
1.9
REFERENCE STANDARDS FOR EQUIPMENT, QUALIFICATIONS, AND CALIBRATION
Reference standards shall be used to calibrate the inspection equipment,
test its operating condition, and record the sensitivity or response of the
equipment during the inspection in accordance with paragraph EQUIPMENT
QUALIFICATION REQUIREMENTS. The standards shall comprise a standard
reference block and reference specimens as noted below.
1.9.1
Standard Reference Block
The standard reference block or primary standard shall be provided by the
Contractor and shall consist of the IIW block in AWS D1.1/D1.1M, Section
Inspection, subsection Reference Standards. The standard reference block
also shall be used in any reinspection on the same basis as the original
inspection, even though the reinspection is to be performed by other
ultrasonic instruments and accessories.
1.9.2
Working Standards
The Contractor may use other recognized working standards detailed with the
IIW block in AWS D1.1/D1.1M such as the Sensitivity Calibration (SC) block.
However, such blocks shall be referenced to the IIW block as noted in
paragraph SENSITIVITY CALIBRATION OF LONGITUDINAL AND ANGLE WAVE SYSTEMS.
Details of their use shall be included in the procedure description
submitted to the Contracting Officer. These blocks are the secondary
standards. They shall be of acoustically similar material to the welds to
be inspected. The secondary standards shall be suited for the applicable
tests specified in paragraph EQUIPMENT QUALIFICATION REQUIREMENTS and shall
be used as follows, except where the IIW block is specifically required:
a.
To assure adequate penetration of the base material.
b.
To provide a secondary field standard.
c. To calibrate the equipment and establish the standard
reference level.
1.9.3
Resolution Test Block
**************************************************************************
NOTE: The test block referred to here is the
Netherlands version of the International Institute
of Welding type of reference block.
**************************************************************************
SECTION 05091A
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