Non-destructive tests do not damage the material or product being tested. Frequently they are built into production processes, as is the case with pipe tested using eddy current equipment.
Hydrostatic, Pneumatic Testing
This is used to test the manufactured item under pressure equivalent to or greater than pressure to be encountered in service. The majority of products manufactured endure vigorous testing. Our Hydrostatic facilities can pressure test up to 910 BarG (13,200 psig) and our Pneumatic facilities can test to a pressure of 413 BarG (6,000 psig) nitrogen. Vee Bee can also offer actual flow proof tests on their in-house liquid flow test rig (air proof testing also available).
Radiography (X-Ray) Testing
The main benefits of radiography are that it provides a non-destructive method of detecting hidden flaws in materials and fabrications and provides a permanent quality record. It is particularly good at detecting volumetric flaws such as voids, gas pores and solid inclusions. It is also good at determining the nature and dimensions (length and width) of flaws. It cannot, however, be used to measure the dimensions of flaws in the through-thickness direction.
Liquid (Dye) Penetrant Testing
Liquid penetrant testing offers a fast and relatively simple means of surface inspection, making it attractive to a number of industries. Dye penetrant testing is used as a quick and simple method for checking that welds and other susceptible areas are free from surface-breaking flaws.
Magnetic Particle Testing
MPI is often used to look for cracking at welded joints and in areas identified as being susceptible to environmental cracking (e.g. stress corrosion cracking or hydrogen induced cracking), fatigue cracking or creep cracking. Wet fluorescent MPI finds widespread use in looking for environmental damage on the inside of vessels.
Planar flaws that break the surface and lie at 90° to the scanned surface e.g. fatigue cracks in weld toes and stress corrosion cracking.
A visual examination can be used to check for obvious problem areas, such as leaks, excess vibration or misalignment. On exposed metal surfaces it can also be used to check for corrosion. There are various aids to visual inspection. As well as magnifying glasses, there are devices for measuring pit depths, weld leg length and surface profiles.
Strain gauges, are small, bondable sensors which are applied to a component, having no mass or significant effect and do not degrade the component performance. Static and / or dynamic loads are applied to the component to determine material stress. This allows loads to be applied to a component to simulate field applications. The data is collected and analysed and is the basis for fatigue evaluations and failure analysis.
Brittle (coating) Lacquer Testing
Brittle (coating) Lacquer testing allows critical stress areas on a component structure to be visualized as the stress directions and stress distribution. This provides location and orientation for stain gauges.
Testing in liquid nitrogen to required sub-zero temperatures.
This is probably the most revealing of the mechanical tests that can be performed upon a specimen of pipe or tubular product material. By recording the gradually increasing load applied and the extension during loading a Stress-Strain Graph can be plotted. From this Graph the following values can be computed.
- Tensile Strength
- Yield Strength or Proof Stress
- Elastic Limit or Yield Point
- Modulus of Elasticity
- Reduction of Area
These tests determine the resistance of a material to indentation.
- Brinell Hardness Test
- Vickers Diamond Hardness Test
- Rockwell Hardness Test
In this type of test, a sample is subjected to sudden force to measure its toughness or resistance to shock.
- Charpy Impact Test
These tests prove the ductility of certain tubular products and confirm the soundness of welds.
- Bend Tests
- Flange Test
- Flattening Test
- Flare or Drift Test
Various corrosion tests are available using different corrosive environments to indicate the performance of material under heavy duty applications.
- Weld Decay Test
- Strauss Test
- Huey Test
- Potentiostat Test