Non-Destructive Testing is a test method to find defects or abnormalities in a product without damaging the product. The products usually tested are welding joints or metal, aboveground storage tanks, pressure vessels, process piping, transmission pipeline and steel structures etc.

The company provides non-destructive testing by various following methods:

Used for finding defects or flaws such as holes or air bubbles, slag-inclusion or inadequate penetration of welding works.

Qualitech Plc. can provide radiographic services using a variety of rays in order to satisfy the needs of the customers:

2.  Ultrasonic Test

Ultrasonic is adapted for usage in non-destructive test in many ways. The method is continually developed and gaining more popularity. At present Qualitech Plc. utilizes knowledge on ultrasonic waves on testing works as follows:

2.1 Ultrasonic Thickness Measurement

used for measuring thickness of pressure vessels such as LPG cylinders, NGV cylinders, chemical containers after their uses. This is because when such containers are subject to long usage or erosion caused by highly erosive chemicals, they become thinner until they cannot withstand the task they were originally designed for.

2.2  Ultrasonic Flaw Detector

is a method that uses ultrasonic waves to detect flaws in the metal after welding, casting and foundry of the containers and equipment. This method is very good at detecting planar defects such as incomplete melting and cracks.

3. Magnetic Particle Test

is a method to find cracks on the surface of iron metal by using induction from DC current or AC current on the testing area, rendering it magnetic. Then, dyed iron powder is sprinkled on to the testing area. If there is a small crack on the product, there will be a magnetic field in the area and attracts the iron powder to form visible lines either to naked eyes or under black light.

 4. Penetrant Test

is a method to find a crack or every smooth, imperforated surface, suitable for finding a crack in pressure vessels or containers made from ferrous steel such as stainless steel containers etc. The test involves painting or spraying dyed liquid which has the ability to penetrate through small cracks or holes. Then, a chemical with similar characteristics with those of blotter is sprinkled on the testing area. If there is a crack, there will be a clearly visible line.

 5. Positive Material Identification Test

 
is a test to indicate the chemical composition of the material using an X-ray fluorescence spectroscopy technique.

 6. Holiday Detector/ Pin Hole test

is a test to find defects of the painting and coating etc. of the product which water and humidity may penetrate through the coating

7. Hardness Test

is a test on the hardness of transformed metal in order to evaluate its work condition.

8. Vacuum Test

is a test to detect a leaking spot on the surface. It can detect leaking both on the floor and the roof of a storage tank.

9. Magnetic field and permeability measurements using a magnetoscop

used for testing magnetic field strength and permeability of metals such as Stainless 304 H

10. Replica Test

used for analysing cause of damage on all materials made of metals

11. Video Borescope

used for testing conditions inside a small pipe or tubes, finding residue or abnormality by using a camera to inspect the condition inside an equipment on which direct inspection is impossible in order to save cost and time otherwise consumed by dismantling the equipment for inspection

12. Ferrite Scope Test 

using magnetic induction to measure quantity of ferrite in stainless steel which affect the resistance to erosion.

13. AE Valve Leak Test

To detect the through valve leak using acoustic emission technology. Avoid losing product to flare or drain to atmosphere or hazard material contacting people.

14. AE Gas Leak Test

Acoustic emission instrument to detect gas leakage to the atmosphere to prevent lose of product, for safety of people, and protection of the environment.

1. Acoustic Emission Test (AE)
used for finding expansion of defects, leakages or rusting of equipment such as aboveground storage tank, pressure vessel. This AE test is a highly advanced technology which enables test to be carried out during a manufacturing process so that there is no need for a suspension of the manufacturing process, reducing testing steps and pollution from sediment inside the tank or pressure vessels.

2. Eddy Current Test (ET)
3. Remote Field Eddy Current (REFT)

is a test for defects on stainless tubes and materials other than iron-carbon of heat exchangers and condensers used in petroleum industry.

4. Magnetic Flux Leakage (MFL)

is a magnetic field test to find defects on iron-carbon tubes with fins of heat exchangers and condensers used in petroleum industry.

5. Internal Rotating Immersion System (IRIS)

is a test using high-frequency waves to find defects on metal tubes of heat exchangers and condensers used in petroleum industry.

6. Phase Array Ultrasonic Test (PAUT)

uses high-frequency ultrasonic  sound to detect defects in metal by combining many elements into one probe which allows the test to cover wider area, be carried out more quickly and give more accurate results than normal ultrasonic methods

.

7. Time of Flight Diffraction Ultrasonic Test (TOFD)

uses high-frequency ultrasonic sound to detect defects in metal by using sound wave-diffraction technology which is very accurate in assessing size and location of a defect.

Top