Environmental Engineering Reference
In-Depth Information
DDP
Defect size, mm
5.22
Defect detection probability (DDP) by the ASME method
using 20% DAC, depending on the size of defects in the direction
of wall thickness: 1) fatigue cracks, 2) volume-planar defects or
hot cracks; 3) volume defects, including flat-bottom drilled holes
3 mm in diameter and gauge holes 9.5 mm in diameter, 4) chains
of defects.
Direction 3
(nozzles and composite welds) focused on the inspection
of nozzles and places for joining pipelines to the casing. Since the shell is
made of a pearlitic steel and piping of an austenitic steel, the programme
included research on test samples containing defects in the composite welds.
Direction 4
(inspection of austenitic steels) provided the study of
detection of stress corrosion cracking with specific features of the structure
of austenitic steels taken into account.
Direction 5
(inspection of steam generator tubes) takes into
account the specific issues of eddy current testing of steam generator
tubes. Investigations were carried out on both the tubes cut out from steam
generator damaged in operation and containing real defects, and the tubes
containing artificial defects.
Direction 6
(mathematical modelling of NDT) included a range of studies
related to the mathematical processing of signals and obtaining the maximum
information about defects from the inspection results. Mathematical models
and computer programs provided by 16 organisations from eight countries
were considered.
Direction 7
(human factor) included studies of the role of the human
factor in inspection and its influence on the inspection results.
Direction 8
(improving the legal and technical instruments in the field
of NDT of the member countries of the PISC programme) included the
following activities:
• informing the technical committees, involved in developing codes
and standards, about the results of PISC;
• critical analysis of national and international technical documents
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