Other Services

ALTERNATING CURRENT FIELD MEASUREMENT

ACFM is in use worldwide in almost every industrial sector. It is particularly well used for in-service inspection as an alternative to MT / PT. ACFM is ideal for crack detection at welds, through coatings and has the added advantage of producing crack depth information. Therefore ACFM can provide cost benefits over conventional surface testing methods such as MT/PT where the removal of coatings and re-application is costly. Rotex Energy uses the AMIGO 2 Crack Microgauge system manufactured by TSC Inspection Systems, this is a rugged site inspection system rated to IP54. Operators are qualified to PCN, ISO & ANST requirements and carry out inspection to TSC operating procedures and the requirements of ASME V Article 15 where required. Typical structures that are inspected with ACFM include cranes, Mooring anchor Triplate retention system, Top side process Module structures. Ships offer many opportunities for ACFM inspection. The ability of ACFM to inspect through paint, and even underwater, mean that ship hulls can be inspected without having to enter dry-dock. Many components in the Oil, Gas and petrochemical industry are coated either in paint, lagging or more exotic materials such as zinc or fire protection materials.

POSITIVE MATERIAL IDENTIFICATION (PMI)

Positive Material Identification (PMI) also referred as Material Verification, is an NDT method used to identify metal alloy element compositions with a portable x-ray fluorescence alloy analyser. PMI is performed on ferrous and non-ferrous metallic materials including welds, weld overlays, castings, forgings, valves and components, pipe, fittings, machined parts, pressure vessels, structural steel, and on components requiring certification to NACE MR0175. Surface preparation and cleanliness are essential when performing PMI, as the depth of penetration for element analysis is minimal. Analysers have a margin of error for element composition in low percentages that may vary depending on the activity of the equipment’s radioactive source. PMI analysers are limited to identifying only those alloys that are listed in the manufacturer’s analyser library, and should not be performed on material in excess of 200°F unless specialized equipment and techniques are used. X-ray fluorescence analysers are unable to detect carbon, sulphur and phosphorus.

IN-SERVICE INSPECTION (PRESSURE VESSEL & PIPING)

Rotex Energy have been carrying out intrusive inspections of pressure vessel equipment for plant operators and assets across Nigeria Oil, Gas, Refining & petrochemical sector since its inception. All our statutory pressure equipment inspectors are well trained in in-service inspection with API in-service inspection certification qualifications. Our in-service pressure vessel equipment inspectors hold complementary certification qualifications in NDT (Non-Destructive Testing), Confined Space Entry (CSE) and IRATA rope access as a minimum. They are well versed in the controls required for safe access and egress of pressure vessels and confined spaces.

INTERNAL ROTARY INSPECTION SYSTEM (IRIS)

The IRIS is an ultrasonic method used for the non-destructive testing of pipes and tubes. Globally plant operators in the oil, gas and refining industries are faced with the challenges of maximising the efficiency and life expectancy of their assets but without sacrificing safety and reliability. Therefore accurate inspection of vital components such as pipes and tubes is crucial to ensuring the integrity of the plant.

Internal Rotary Inspection System (IRIS) can detect corrosion, pitting and wall loss and is most commonly used for tube inspection in boilers, heat exchangers, air coolers and feed water heaters. It is particularly versatile as it is suitable for both ferrous and non-ferrous materials, and IRIS can be used on a wide range of tube diameters and wall thicknesses.

An IRIS probe is inserted into a tube flooded with water. The probe is fitted with a transducer that generates an ultrasonic pulse along a path parallel to the axis of the tube. A rotating mirror directs the ultrasonic pulse into the tube wall. The mirror is driven by a small turbine that is rotated by the pressure of water pumped into the tube.

The ultrasound pulses are reflected by the inner-diameter (ID) wall and outer-diameter (OD) wall of the tube and the time of flight difference between the two diameters is used to calculate the wall’s thickness. As the IRIS probe is pulled, the spinning motion of the mirror results in a helical scan path ensuring full coverage of the tube.

Why use IRIS include?

  • Sensitivity to both internal and external defects
  • Defect position can be located in relation to tube length
  • 100% coverage of the tube
  • Results data storage
  • Suitability for ferrous and non-ferrous materials
  • Detection of corrosion, pitting and wall loss
  • Accurate wall thickness measurements

STORAGE TANK INSPECTIONS

Rotex Energy are able to provide a complete service to inspection storage tanks. Inspections can be undertaken to meet the requirements of API. We have experienced qualified Technicians to perform the inspection. Rotex  Energy carry out the tank NDT inspections utilising the latest specialist and conventional NDT techniques.
NDT Techniques currently utilised on tank inspections include:
• Magnetic Flux Leakage (MFL)
• Remote access ultrasonic crawler
• Ultrasonics – (Conventional and Specialist)
• Magnetic Particle Inspection (MPI)
• Dye Penetrant Inspection (DPI)
• Eddy Current
• Alternating Current Field Measurement (ACFM)
• Acoustic Emission

Rotex Energy are willing to visit individual sites to discuss tank inspection requirements, advise on the preparation needed for inspection and to assist preparing a tank inspection programme. We can carry out external and internal inspections to meet customer demands.
On completion of the tank inspection we will produce a detailed report for each individual tank, the reports contain CAD drawings and tables to aid easy interpretation of results. The report will provide a thorough condition report of the tank, recommending any repairs/alterations needed to ensure the tank is acceptable to the relevant standards. To assist in future planning we can also provide the client with a programme of when the next inspection will be due for each tank.

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