Conventional NDT Services
Ultrasonic Testing uses high frequency sound energy to examine components. Possible uses are flaw detection/characterization, precision measurements
It is a non-destructive testing (NDT) method in which beams of high frequency sound waves that are introduced into the material being tested are used to detect surface and sub-surface flaws. The sound waves travel through the materials with some attenuation of energy and are reflected at interfaces. The reflected beam is detected and analyzed to define the presence and location of flaws.
Cracks, laminations, shrinkage, cavities, bursts, flakes, pores, bonding faults and other discontinuities that can act as metal-gas interfaces can be easily detected. Inclusions and other inhomogeneity’s in the metal being inspected can also detected by causing partial reflection or scattering of the ultrasonic waves, or by producing some other detectable effect on the ultrasonic waves
Magnetic Particle Testing
MPT (Magnetic Particle Testing) is an NDT technique designed to detect surface indications in ferromagnetic materials
The method is used to inspect a variety of product forms including castings, forgings, and weldments. Many different industries use magnetic particle inspection such as structural steel, automotive, petrochemical, power generation, and aerospace industries. Underwater inspection is another area where magnetic particle inspection may be used to test items such as offshore structures and underwater pipelines.
Dye Penetrant Testing
This method is used to reveal surface discontinuities by bleed out of a colored or fluorescent dye from the flaw.
The technique is based on the ability of a liquid to be drawn into a "clean" surface discontinuity by capillary action. After a period of time called the "dwell time", excess surface penetrant is removed and a developer applied. This acts as a blotter that draws the penetrant from the discontinuity to reveal its presence. Materials that are commonly inspected using this method include; metals, glass, many ceramic materials, rubber and plastics. However, liquid penetrant testing can only be used to inspect for flaws that break the surface of the sample (such as surface cracks, porosity, laps, seams, lack of fusion, etc.).
Vacuum Box Testing
Vacuum Box testing is used to check for any leaks or fault in the welding of bottom & annular plates of the storage tank
The objective of the vacuum box technique of bubble leak testing is to locate leaks in a pressure boundary that cannot be directly pressurized. This is accomplished by applying a solution to a local area of the pressure boundary surface and creating a differential pressure across that local area of the boundary causing the formation of bubbles as leakage gas passes through the solution
Holiday Spark Testing
A holiday spark test is a procedure used to check for inconsistencies such as pinholes, discontinuities, holidays and voids in coatings covering metallic surfaces.
In a spark test, a voltage is applied across metal fibers temporarily placed on the coated surface. Where holidays exist, the underlying metal surface is accessible and a circuit is created that allows an electric current to flow. This creates a spark and notifies a device or person of the holiday. Holiday spark tests are particularly important when applying anti-corrosive coatings, because undetected holidays leave the underlying metal prone to corrosion at those locations.
UTG can be defined as a Non Destructive technique, to measure the thickness of the material or parts that not required access to both sides of the material or parts.