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During the years since this book was first published in 1993 there
have very few developments in the technology of magnetic particle
inspection apart from improvements in instrumentation which has
made the measurement of peak values of time varying currents
practicable. The major changes have arisen from health and safety
and environmental concerns. These involve chemicals and exposure of
personnel to air-borne electromagnetic fields and long wave
ultraviolet (UY.A). The changes in the acceptability of certain
volatile halogenated hydrocar bons which led to the banning of 1,
1, 1 thichloroethane in 1995 were evident in 1993. The present
discussions concerning the emissions of volatile organic compounds
(VOCs) in general was also current and has now reached a stage
where the effects of these deliberations will become evident over
the next few years. Concerns over the exposure of personnel to
airborne electromagnetic fields has been current for some years as
has discussions to the effects of long wave ultraviolet (UY.A) on
human skin. Recommendations as to maximum permit ted exposures over
periods of time to both of these phenomena have been put forward
and will doubtless form the basis of future legislation on the
matter. A number of new specifications have appeared notably EN
(European) and ISO specifications and some of these are still in
preparation. Generally their impact will be minimal since these
specifications are largely derived from existing documentation."
The main aim of this book is to provide a concise guide to the
penetrant inspection method of non-destructive testing. The
emphasis is practical and is aimed at indicating how the various
processes can be applied. The book begins with a survey of the
history of the technology and the introduction of non-destructive
testing. It goes on to discuss the penetrant process itself, its
development, principles of the processes, techniques, choice of
methods and the equipment that can be used. It also examines the
quality control of penetrant materials and processes. The final
chapters deal with health and safety and the management of
penetrant waste.
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