Non Destructive Testing Services (NDT)
HANDA Solutions provides non-destructive testing services and has certified technicians with expertise in various industry sectors including oil, shipbuilding and repair, fabrication and construction.
By conducting NDT, professionals can identify potential issues and make informed decisions about maintenance, repair, or replacement, all without causing any harm to the inspected materials or components.
The range of non-destructive testing (NDT) methods we conduct:
Visual Testing (VT) or Visual Inspection requires line-of-sight contact with the portion of the specimen to be inspected, adequate illumination of the test specimen, a thorough understanding of the nature and origin of discontinuities and potential defects within the test object.
Visual Inspection (VT)
VISUAL TESTING (VT) can be the first method of inspection by our certified NDT technicians to detect defects and observe problems in the earliest stages of fabrication.
The test method is applied to almost every product as a quality assurance tool. The most detrimental unacceptable discontinuities in the objects are the surface discontinuities.
Liquid Penetrant Inspection (LPI, PT)
Our non-destructive testing technicians use liquid penetrant inspection method that reveals surface breaking flaws by bleed out of a penetrating liquid colored with a visible or fluorescent dye from the flaw.
This method is used to inspect a variety of product forms including castings, forgings, and weldments. It is one of the most portable of the surface inspection methods and also has the advantage of being able to detect flaws in non metallic and non ferromagnetic materials.
The technique is based on the ability of a liquid to be drawn into a “clean” (in other words, unobstructed) surface breaking flaw by capillary action. After an appropriate period of time for penetration has passed, called the “dwell time,” excess penetrant on the surface is removed and a developer applied. The developer acts as a blotter and draws the penetrant from the flaw to reveal its presence. Penetrants with a visible dyed added (color contrast) require sufficient white light to ensure proper inspection, while penetrants with a fluorescent dye added need to be used in darkened conditions with an ultraviolet or “black light”.
MT – one of the most widely utilized nondestructive testing methods. It uses magnetic fields and small magnetic particles similar to iron filings to detect flaws in components. The only real limitation is that the component being inspected must be made of a ferromagnetic material such as iron, nickel, cobalt, or one of their alloys. The method is used to inspect a variety of product forms including castings, forgings, and weldments.
Magnetic Particle Inspection (MPI, MT, FMPI)
Magnetic Particle Inspection is one of the fastest and most cost effective nondestructive examinations used for detecting surface and near surface flaws and defects. Our certified and experienced non destructive testing inspectors can determine the origin and cause of both surface and near-surface discontinuities.
The test method using fluorescent coated particles is called as Fluorescent Magnetic Particle Inspection or test (FMPI). The particles are colored and coated with fluorescent dyes that are made visible with a hand-held ultraviolet (UV) light (black light).
Ultrasonic Inspection (UT)
Ultrasonic inspection is used by our certified technicians for flaw detection/evaluation of variety product forms including castings and weldments. It is commonly used test method in shipping, offshore, fabrication and other general industries.
Ultrasonic Testing (UT) uses high frequency sound energy to conduct examinations and make measurements. The simplest explanation of what happens in this method is that sound energy is introduced via a transducer and propagates through the materials in the form of waves. When there is a discontinuity (such as a crack) in the wave path, part of the energy will be reflected back from the flaw surface. The reflected wave signal is transformed into an electrical signal by the transducer and is displayed or recorded in a variety of ways. Both surface and subsurface defects can be detected making ultrasonics a volumetric testing method.
RT technique involves the use of penetrating X-ray radiation produced by an X-ray tube. The resulting shadowgraph shows the possible internal imperfections of the object which are indicated as density changes in the film in the same manner as an X-ray showing broken bones.
RT indicates these types of weld flaws:
- Cracks,
- Porosity,
- Inclusions,
- Lack of fusion,
- Incomplete penetration.
Radiographic Testing (RT)
Verify the integrity and quality of welds, materials, and dimensions with non-destructive Radiographic Testing (RT). RT allows us to identify voids/porosities, internal stress fractures and other internal discontinuities.
Our commitment is to provide our customers with the highest standard of services. For each type of survey, we ensure that relevant inspection standards are utilized, maintained and supported by our professional and experienced team. Comprehensive thoroughly documented reports are our standard.
RT advantages:
- Provides permanent record on film,
- Standardized technique,
- Reference standards available,
- Adjustable energy level gives high sensitivity.
Ultrasonic Thickness Measurement (UTM)
In many industrial maintenance-situations it is necessary to measure the remaining thickness of the metal that is subject to corrosion. Ultrasonic Thickness Measurement (UTM) is a non-destructive testing method used to inspect the local thickness of metallic material and non-metallic materials such as plastics, ceramics, glass and any other good ultrasonic wave conductor. UTM is frequently used to inspect metal thickness in industrial settings.
A NDT technician with portable UTM equipment and probes can access steel plating in walls, tanks, decks and the superstructure of ships. Thickness gauges are used that have the ability to measure through painted or coated surfaces and eliminate the thickness of the paint. To ensure effective contact, any visible corrosion is removed and then petroleum jelly or similar substance is applied before pressing the probe against the metal.
The advantages offered by Ultrasonic Thickness Measurement are:
- Speed, reliability, and versatility.
- The probe only requires access to one side of the tested part or component.
- The portable equipment allows for on-site inspection and results are instant.
- The equipment is easily deployed and does not require laboratory conditions.
- No cutting or sectioning is required.
The basic principle of this method consists of creating a pressure differential across a leak and observing for bubbles in a liquid medium located on the low-pressure side. The sensitivity of the method is dependent on the pressure differential and the liquid used for testing. As long as the pressure differential can be maintained across the tested area, this method can be used.
Leak Testing (LT)
Leak Testing (LT) is used to detect and locate through leaks using bubble technique. The bubble test it is an efficient and safe leak testing procedure of the welding seams of containers, pipes and many other welded structures.
Under a sealed vacuum pressure chamber, foam shows up where air flows through leak path. To ensure that even small leaks become visible the vacuum in the pressure chamber must be maintained for at least 30 seconds.