Introduction of NDT
• It is a wide group of analysis &
techniques used in technology
industry to evaluate the properties
of material component or system
without causing damage.
• it is a highly valuable technique
that can save both money and time
in product evaluation,
troubleshooting, and research
Brief History of NDT
• It is said that that flour and oil
were used during Roman times to
find cracks in marble slabs. For
centuries, blacksmiths used sonic
NDT when listening to the ring of
different metals as they were being
hammered into shape; a technique
also used by early bell makers.
• One of the first recorded uses of
NDT was in 1868, when
Englishman S.H. Saxby relied on
the magnetic characteristics of a
compass to find cracks in gun
Importance of NDT
• NDT increases the safety &
reliability of product during
• It decreases the cost of the product
by reducing scrap and conserving
materials, labour and energy.
• It enhances the reputation of the
manufacturer as a producer of
• This not only increases the
safety of operation but also
eliminates any forced shut down
of the plants.
• Inspection of Raw Products Forgings, Casting,
• Inspection following Secondary Processing
Machining , Welding, Grinding, Heat Treatment ,
• Inspection for In-Service Damage Cracking,
Corrosion, Erosion/Wear, Heat Damage.
Market Of NDT
• Non Destructive Testing Market is estimated to
grow at a CAGR of 3.5% to reach the worth
$1720.96 Million by 2020.
• Major Revenue Generating Regions –U.S. And
• Latin America and Asia-Pacific are emerging market.
• Brazil, India and China have immense growth
potential for NDT.
Power Plant Inspection
• Periodically, Power
Plants are shutdown for
feed eddy current
probes as well as UT
probes into Heat
Exchanger tubes to
check for corrosion
• Special cars are
used to inspect
thousand of miles
of rail to find
cracks that could
Storage Tank Inspection
inspect walls of
for signs of
thinning due to
• Cameras on
arms are used
Wire Rope Inspection
• Electromagnetic devices
and visual inspections are
used to find broken wires
and other damage to the
wire rope that is used in
chairlifts, cranes and other
• Non destructive testing is
used extensively during the
manufacturing of aircraft.
• NDT is also used to find
cracks and corrosion
damage during operation of
• A fatigue crack that started
at the site of a lightning
• NDT is used to inspect pipelines to prevent that
could damage the environment.
• Visual inspection, radiography and electromagnetic
testing are some of the NDT methods used.
Crash Of United Flight 232
Sioux City, Lowa, July 19,1989
• A defect that went undetected in an engine disk
was responsible for the crash of United Flight 232
• Aerospace Engineering
• Mechanical Engineering
• Electrical Engineering
• Civil Engineering
• System Engineering
• Even today, more than 80% of airframe maintenance inspections are
visual, but advanced Non-destructive testing (NDT) techniques now play
a critical role in identifying and sizing defects during manufacture and
throughout equipment service life, as governed by airworthiness
• One recent innovation in this area has been GE Inspection Technologies
first phased-array system certified to inspect engine disks.
• The ability to carry out reliable yet fast inspection to keep pace with
maintenance requirements. Advancements in phase array Ultrasonics
pulsed eddy current, and digital and computerized radiography are
expected to meet the need to inspect aging aircraft and predict the
effects of long-term corrosion to extend useful aircraft life.
• NDT techniques provide cost-effective & reliable analysis under
• Each NDT technique has certain capabilities & limitations &
often more than one technique is used to cover various parts.
• Increasing availability of robotics,scanners improve the speed of
testing large surfaces, hence minimizing the testing time.
• Thanks guys for listening me Carefully.
• Greatly Thanks to Ravi sir for giving me a opportunity to
stand in front of you for share information about NDT.