OCA Global always provides customised solutions. We can guide our customers throughout their projects, offering the highest level of technical assurance, reducing risks and unproductiveness through a series of tests and offering an objective overview of the status of their assets.
We count on the latest inspection technology and a team of qualified and certified professionals able to carry out inspections according to any type of specifications, laws, standards or international clients. This means that our clients save on maintenance costs, improve the quality of their production and are able to guarantee the reliability and safety of their operating procedures.
Advanced Non-Destructive Testing (ANDT)
- Acoustic emissions tests in LPG tanks
- Magnetic Flux Leakage Test
- Pulsed Eddy-Current (PEC)
- Acoustic Emissions
- Guided Waves
- Time of Flight Diffraction (TOFD)
- Phased Array (PA) Ultrasonic
This test replaces hydraulic tests on LPG tanks to determine the suitability of the tank without having to empty it and, therefore, have to stop supplying the customers while the test is being performed.
This test can be performed on aerial and buried tanks, no matter the capacity, in which the fluid contained is a LPG – usually propane. Periodic tests must be performed every 15 years to check their condition.
The test consists on the removal of the liquid phase from the tank that is heated it in a vaporiser, and returned to the tank in gas phase. After this process, the pressure is increased in a controlled manner, while signals are collected by a series of sensors placed on the walls of the tank. This non-destructive method helps to anticipate future defects, detecting their existence before the regular use causes a rupture.
UNE-EN 14584: 2013
The storage of hazardous products in tanks must be carried out safely and a series of checks and inspections must be performed in order to have information about the condition of the tanks – especially of the bottom of it – to minimise economic and environmental risks. During the inspection, the larger the corrosion area, the larger the magnetic field.
In order to reduce inspection time, we offer a quick and reliable service in which we combine two techniques: magnetic flux leakage and conventional ultrasounds. By means of these two techniques, corrosion can be detected with great efficiency (leakage of magnetic flux) and be accurately quantified (conventional ultrasound).
Compared with conventional eddy current testing, during a PEC inspection there is no need for direct contact with the object being tested. Measurements can be performed through coatings, insulation materials, and even corrosion products. This means that this type of inspection can be carried out on any material that does not conduct electricity, a very useful characteristic that also enables high temperature testing or offshore well inspections. This fact also makes PEC very suitable for inspections where the surface of an object is not accessible.
If you need to detect flaws in metallic pressure equipment, acoustic emission testing is one of the most reliable ways to detect the early stages of stress corrosion cracking. When a material undergoes stress or a series of internal changes, such as corrosion, it generates energy from a localised source, producing sound waves. Acoustic emission testing is a non-destructive testing method designed to monitor sound waves emitted during material stress or failure. This condition enables inspectors to examine metal deformation under stress and detect the sound of cracks and failures taking place within the material.
Unlike other non-destructive testing methods, acoustic emission testing does not send energy into the inspected pressure vessel, but rather detects the energy emitted by the equipment itself. This technique is therefore time-effective because it can be performed during standard operation. Acoustic emission testing enables you to monitor and inspect your entire pressure equipment, from tanks to welds. It provides immediate results and early warning about potential damages or failures in pressure equipment as well as solutions to determine the appropriate pressure level.
The guided waves test is an advanced corrosion inspection method that uses low frequency guided ultrasound waves that travel along a duct, providing 100% coverage of its length. Effected areas are precisely located in terms of distance from the transducer ring and highlighted for further local examination through visual inspection or other conventional NDT methods. This non-destructive detection technique can be used without the need of extensive scaffolding and minimises the requirement of having to remove piping insulation.
Welding defects can compromise the stability and integrity of welded structures. Time of flight diffraction (TOFD) is a high performance non-destructive testing (NDT) technique that offers accurate detection of cracks or lacks of fusion.
Medical sonograms are usually performed with special multi-element transducers known as Phased Array. This technology is also used in industrial environments to provide new levels of information and visualisation in common ultrasonic tests.
Phased array is widely used in several sectors, from power generation to construction industries. It is an advanced non-destructive testing (NDT) method that uses an ultrasonic technique to determine component quality and detect flaws or cracks. Phased array ultrasonic testing can also be effectively used for thickness measurements or to assess corrosion levels. Its efficiency is due to the combination of many angles and focus depths through a probe, which then performs several different inspections without the need to alter the transducer assembly. The inspection results are clearly stored and displayed for subsequent reporting. This method can be used on standard and special materials – such as austenitic and high alloy materials.
With this technique we can obtain the following advantages:
- Greater speed and probability of inspection.
- Greater probability of detection.
- Better traceability.
- Comprehensive reports.
- Use of a single probe for all angles.
- Greater safety, avoiding the risk of using ionising radiation.