Non Destructive Techniques (NDT)
Authors: W.D. Dover, R. Collins, D. H. Michael
Ac-field measurement technique measures and
interprets field perturbations in a region containing a
surface flaw. ACPD, as it was originally called, has a
long history of malpractice but was so eminently
suitable for laboratory monitoring of fatigue cracks that
it was reassessed for this purpose. The technique
consists of impressing an AC current into the region
containing the flaw and exploring the surface—voltage
distribution with a probe.
The documents are classified chronologically, starting with
the oldest at the beginning of the list.
Initially edited in hard copy, this book was considered
one of the most relevant documents when published.
Apart from some new technologies that did not exist
when it was written, we can say that this document is
still actual and should be considered a reference
Authors: A.I.Bondarenko, E.O.Paton
Extended welded pipelines are characterized by the
presence of various discontinuities in them related to
the change of material density and/or cross-section of
pipe walls on their joint boundary and/or along the
pipe length. This paper deals with detecting these
discontinuities, with which low-frequency guided
waves of longitudinal and torsional modes interact
during their propagation in the form of a circular wave
through the pipe cross-section.
Author not indicated
Ultrasonic Testing (UT) uses high frequency sound
energy to conduct examinations and make
measurements. Ultrasonic inspection can be used for
flaw detection/evaluation, dimensional measurements,
material characterization, and more. To illustrate the
general inspection principle, a typical pulse/echo
inspection configuration as illustrated below will be
used.
Author unknown
This presentation provides information on magnetic
particle inspection methods (MPI).
It can be used to teach divers on the purpose and
implementation of such procedures during
mobilization and maintenance. This document does
not explain underwater MPI.
Publisher: Mark Stephen Rogers
This presentation shows the applications, advantages
and disadvantages of various Non-Destructive
Techniques (NDT) used in multiple industries,
particularly in the offshore and petroleum industries.
Author: Micheal C. Smith
This document describes the inspection procedure to
be used with the Underwater ACFM instrument for
manual inspection with standard probes. These probes
are designed to be deployed by divers, with data
collected and sent to a controlling PC.
TSC Subsea is a company based in the UK
https://www.tscsubsea.com/contact/
This document can be classified under the “Technical
document - Vessels” rubric. Nevertheless, it provides
guidelines that can be used to organize inspections.
Publisher:
The american society for non destructive testing, inc.)
This training package provides essential knowledge of
radiography according to the American Society for
nondestructive testing (ASNT) requirements ( ASNT
can be contacted @ https://www.asnt.org/).
Author:
Reza K. Amineh, Maryam Ravan, Hesamedin Sadeghi,
and Rouzbeh Moini
In the alternative current field measurement (ACFM)
technique, the nonzero value of liftoff distance for the
magnetic sensor acts as a low-pass filter on surface
crack signals, causing errors in crack detection and
sizing. The authors present a blind deconvolution
algorithm for Liftoff evaluation and surface crack signal
restoration.
Publisher:
The american society for non destructive testing, inc.)
This training package provides essential knowledge of
magnetic testing according to the American Society
for nondestructive testing (ASNT) requirements (ASNT
can be contacted @ https://www.asnt.org/)
Publisher: Siemens Rolling Stock Pvt. Ltd, Aurangabad
This presentation can be used to inform personnel on
ultrasonic testing
Publisher: International Atomic Energy Agency
Even though this document is not specifically designed
for diving activities, it provides essential information
regarding Eddy Current.
Publisher: Dzevad Hadzihafizovic
This handbook provides basic information about weld
conditions, gauges, symbols, and weld terms.
Authors:
Jasper A. Agbakwuru, Ove T. Gudmestad, John
Groenli, Helge Skjaveland
This paper demonstrates a technique for tracking and
identifying leaking points on pipelines installed in
unclear/muddy water conditions using optical
cameras. The method leads a remotely operated or
hyperbaric system to the leak in muddy water
conditions for close visual inspection and subsequent
repair.
Publisher:
The american society for non destructive testing, inc.)
This book was previously published as Supplement to
Recommended Practice SNT-TC-1A (Q&A Book):
Ultrasonic Testing Method, first published in the 1980s.
It is based on previous Q&A Book editions.
Authors:
Ken Woolley, Tim Woolley, and Bruce Banfield
Since the beginning, underwater MPI has been carried
by night due to the inks' characteristics. New inks are
now available, although they are for topside use and
thus are not necessarily applicable to underwater
conditions. Recent trials have been conducted to
determine the suitability of available inks to increase
white light levels underwater. This paper presents the
work and discusses the findings, which have
application worldwide.
Publisher: Frontline
This document provides procedures for visual and
optical inspection according to “Frontline”, a company
specialised in non destructive techniques
(https://frontlinetesting.com/ )
Authors: Restu Putra & Ahmad Irsyad
This presentation is another document that can be
used to initiate personnel to Eddy Current inspection.
Author: Mark W Hounslow
Particulate matter derived from various fuel
combustion sources contains minor to trace amounts
of Fe-oxides that magnetic measurements can detect.
These magnetic particulates can be used as proxies for
particulate pollution since oxide contents are often
more significant in quantities and may have distinctive
magnetic properties compared to most types of
natural dust.
Author:
Ali Khaloo , David Lattanzi, Adam Jachimowicz, and
Charles Devaney
This paper presents a case study where
photogrammetry was used to create comprehensive
and high-resolution 3D point clouds of a dam and
surrounding environment at intervals. These models
were then assessed for their quality and ability to
resolve defects that were artificially applied to the
structure between inspection intervals. The results
indicate that the integrated process can generate
models that accurately render various defect types
with sub-millimeter accuracy.
Authors: Restu Putra & Ahmad Irsyad
This presentation is another document that can be
used to initiate personnel to Eddy Current inspection.
Publisher: International Atomic Energy Agency
Even though this document is not specifically designed
for diving activities, it provides essential information
regarding the use of NDT .
The organization for which it has been designed is
proof of quality.
This is another document from the International
Atomic Energy Agency, not specifically designed for
diving activities, that provides essential information
regarding the use of NDT.
Tomography is an x-ray technique in which shadows
of superimposed structures are blurred out by a
moving x-ray tube. This method is used in radiology,
archaeology, biology, atmospheric science,
geophysics, oceanography, plasma physics, materials
science, astrophysics, quantum information, and other
areas of science.
This document is provided by the International Atomic
Energy Agency.
