Inspection Services24x7

Infrared Thermography

Time of Flight Diffraction (TOFD)

Thickness Mapping of Boiler Tubes

Tube Testing

Shor t Range Guided Wave Ultrasonic Technique

Remote Visual Inspection

High Temperature Thickness Gauging

Oxide Scale Thickness Measurement

Ultrasonic Thickness Gauging

Magnetic Par ticle Testing

Liquid Penetrant Testing

On-site Hardness Testing

Coating Thickness Measurement

Ultrasonic Flaw Detection

Advanced Services Conventional Services

TOFD is an advanced ultrasonic inspection technique that differs from conventional pulse echo technique. In TOFD diffracted signals from the edges of the defects are monitored & related to the true position and size of the defect as opposed to the reflection on defects according to a reference reflector.

The TOFD technique uses two probes in a transmitter-receiver arrangement. When sound is introduced into the material via the transmitter the defect will oscillate. Each defect edge works as a source point of ultrasound signals. These very weak signals are called diffracted waves and their appearance does not relate to the orientation

Time of Flight Diffraction (TOFD)

Infrared Thermography is one of the most cost effective & proven predictive maintenance techni-que available to quickly, accu-rately & safely locate problems prior to failure.

We provide thermography ser-vices for predictive & preventive analysis in all types of industries. Our trained technician will bring the right thermography camera to

Infrared Thermography

conduct a comprehensive thermographic survey quickly & accurately. The concern areas & vulnerable spots are repor ted immediately so that corrective actions can be taken based on the severity of the problem.

Advantages of Thermography

- Reduction of production losses due to unplanned downtime

- Reduced maintenance and repair costs

- Increased equipment life

- Increased Mean-Time-Between-Failures (MTBF)

- Increased productivity and profitability

Eddy current testing is an NDT inspection method used to detect defects in heat exchanger tubing. Conventional eddy current testing as

Tube Testing

per ASME Section V is used for inspection of non-ferromagnetic tubing such as stainless steel, titanium, copper, brass, copper-nickel alloys, hastelloy, etc.

We provide eddy current testing services for tubing using encir-cling coil during manufacturing & absolute bobbin coil during in-service inspection.

Advantages of TOFD

- In contrast to the radiography method, planar defects & cracks, which are not perpendicular to the measured surface can be detected.

- Defect height can be exactly determined.

- The evacuation of areas because of radiation is not necessary.

- The inspection results are immediately available, as is a permanent record & a permanent print as longitudinal or transversal projection of the weld is available.

- Because of the high test speed the costs are less than those for radiography for wall thickness above 25 mm.

- The inspection can be performed above 200° C.

- TOFD saves costs, if applied during construction, since it is possible to distinguish pre-service and in-service defects. That means the unit can stay longer in production, and is safe.

Short Range Guided Wave Ultrasonic Technique

The Shor t Range Guided Wave Ultrasonic Technique was designed to test the annular plate of above ground storage tanks while the tank remains in-service. The technique is based on the concept of pulsing guided laminar waves into the base material from the chime area. The waves propagate up to three feet into the annular plate. When corro-sion, pitting, erosion are present the ultrasonic waves mode conver t and are received by the same transducer.

The technique is also being used to test for corrosion under pipe suppor ts, corrosion at soil air interfaces, and similar difficult to access locations.

We offer thickness mapping of boiler tubes using temate TG-IS (B). The temate TG-IS (B) is a redesigned FST (Fast Scanning Thickness) Gage which was first introduced in 1994. FST Gage was developed by Electric Power Research Institute (EPRI) & Babcock & Wilcox (B&W) speci-fically to scan boiler tubes & provide a continuous measure-ment of tube wall thickness.

The probe with integrated encoder and light indicators (for fast visual aler t to the operator) is manually scanned along the boiler tube while the system records the thickness & alarms if the tube is below a pre-programmed threshold or other defect conditions are triggered. The system saves a complete record of each tube & the whole boiler for later post analysis & tracking.

Apar t from detecting wall loss the system is capable of detecting hydrogen damage, pitting & caustic gouging (by measuring signal attenuation) which is not detected with conventional means. It works on carbon steel and clad tubes. Tube thickness ranges from 3.8mm to 12.7mm & the minimum tube diameter requirement is 22.2mm, the tube surface can be oxidized, rough or pitted (scale-free).

The technique permits 100% inspection of the boiler instead of spot checking at up to 15cm/s of scanning speed. The boiler mapping tool permits easy visualization of boiler walls with results of inspection for fast analysis & interpretation.

Thickness Mapping of Boiler Tubes

The system works on ultrasonic EMAT (Electro Magnetic Acoustic Transducer) technique providing accurate thickness (with accuracy of ±0.127mm) readings with none or minimal tube surface preparation.

of flat or spherical defects. These diffracted signals are received via the receiver probe. The diffracted signals are evaluated to clear gray scale B-scan or D-scan images.

The amplitude of the signal is not displayed, but the position of the signals on the time scale are displayed. Thus it is possible to determine the defect location exactly- length, & defect height.

Remote Visual Inspection (RVI) / Boroscopy

Remote Visual Inspection (RVI) is used to visually inspect plant components for surface defects, general condition, degradation, blockages & foreign material. It can be used as standalone inspection or as a complement to other NDE techniques, such as eddy current, ultrasonic or X-ray, in order to qualify unclear signals or pinpoint where a more thorough inspection is needed.

We offer a turnkey inspection solutions, whether it is inspecting high energy piping, performing a loose par t retrieval or diagnosing an operational problem, we bring the right equipment to visually inspect (or retrieve) it, record it, and repor t it back to you.

Applications Include:

- Nuclear reactor heads, reactor coolant pumps, demineralizers, containment structure, & other components

- Piping systems such as service water, fire protection, oil, coal handling, steam, boiler, feed water, & other piping

- Condenser, feed water heaters, steam generators, & other heat exchangers.

- Surveillance, cover t operations, search & rescue tasks - Gas, steam & wind turbines

- Electrical generators & transformers - Sanitary piping & tubing

- Boiler water piping & components - Foreign material search & retrieval

Inspection of Large Vessels

Remote Visual Inspection of large surface areas requires an indus-trial Pan, Tilt & Zoom camera. The 4.62 inch diameter of the PTZ camera is capable of fitting into openings 5-inches or larger. It can also be submersed under-water up to 100-feet. The auxi-liary lamp module provides extra

Inspection of Pipes

Ultrasonic Flaw Detection

Ultrasonic Thickness Gauging

Magnetic Particle Testing

On-site Hardness Testing

Coating Thickness Measurement

Liquid Penetrant Testing

Conventional Services:

We use steerable crawler to ins-pect pipes of various diameters. These crawlers are well suited for carrying out inspections on pipe systems, especially those that have a lot of bends and pipe branches. The hand-held remote pendant easily steers the crawler around multiple elbows & solid obstructions and controls the

crawler's focus, lighting, speed and pan & tilt functions. This is the most common inspection technique to inspect sewer, drain, water, electrical conduit and process lines in various industries.

Applications Include:

- Air ducts and electrical conduits - Lube oil and steam lines

- Small pressure vessels & tanks - Steam headers

- Loose-par ts retrieval

lighting for extremely dark inspection environments.

Applications Include:

- Nuclear fuel bundle s.no.verification - Large Pipe

- Tanks and Vessels - Coke Drum Lining

- Floating Roof Inspection - Railroad & Truck Tank Cars

- Refractory Linings - Contamination detection

- Crude Units, Catalytic Cracker - Storage Tanks

- Fractionation Towers - Spheres

High Temperature Thickness Gauging

Although most ultrasonic flaw detection and thickness gaging is performed at normal environ-mental temperatures, there are many situations where it is nece-ssary to test a material that is hot. If the material being tested is hotter than approximately 50° C then high temperature transdu-cers & special test techniques should be employed.

Periodic measurement of scale thickness allows a plant operator to estimate remaining tube service life & to identify & replace tubes that are approaching the failure point. Ultrasonic testing provides a quick & non destruc-tive method for measuring scale.

Oxide Scale Thickness Measurement

By using 38DL PLUS thickness gage we can measure internal oxide layers down to a minimum thickness of approximately 0.125 mm.

619 & 620 The Great Eastern Galleria, Plot No.20, Sector 4, Nerul, Navi Mumbai 400706

Tel.: +91-22 6138 0600, 2770 3913, 2770 3923, 2772 9077 | Fax: +91-22 2770 3903 | Email: info@ndts.co.in | www.ndts.co.in

We are a focused company dealing into Non Destructive Testing (NDT) products &

services. Our activities include sales & distribution of NDT equipments, providing

on-site inspection services and manufacturing of accessories for NDT.

At NDTS India, we constantly endeavor to fulfill our customers varied testing

needs and are deeply committed towards surpassing their expectations. We value

and cherish their valuable suggestions and assistance in identifying impor tant

trends from time to time. By vir tue of our focus, core competencies, a committed

team of professionals and our unrelenting quest for excellence, we are fully geared

to meet future challenges.