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Specialized non-destructive testing services
KIRR, bump test, boresonic, honing, boilers, VINSPEC, COMB
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Historic failures of turbine rotors and generators has resulted in a broad spectrum of events which range from catastrophic burst to prolonged forced outages that ultimately inflict gross economic penalties upon affected utilities. KEMA developed a range of special NDT services to reduce the risks to a minimum.
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Generator stator end windings bump test
Based on 25 years experience in non-destructive testing (NDT) services, KEMA introduces bump testing for generator stator end windings. A package comprising tools, transducers and unique analysis software is used by our experts to serve you on-site or at the generator repair shop.
With bump testing, indications of double-frequency operation can be found before the vibration becomes too severe. Therefore, major failures can be avoided and less costly repairs can be performed by reinforcement of stator winding insulation.
For more information about the bump test service: contact us or download the brochure below.
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Generator retaining ring inspections
The generator is one of the most crucial parts of a power plant: this is where the electric energy is generated. Among the critical components of the generator are the retaining rings at each end of the rotor. As a result of specific mechanical, chemical and electrical circumstances, flaw indications may appear in these rings. KEMA has a cheap alternative to perform a reliable condition assessment: the KEMA Inspection system for Retaining Rings (KIRR).
Benefits:- Major savings, since rotor rings will not have to be replaced
- Constant awareness of the condition of the retaining rings
- Continuous monitoring
- Cost reduction because the rotor and the retaining rings do not need to be disassembled
- Fast measuring: less than 24 hours to measure two retaining rings
- Short delivery time.
For more information download the brochure below, view the animated demonstration or contact us.
For more up-to-date information download the presentation held at the POWER-GEN Europe 2008 exhibition and conference.
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Turbine and generator honing and boresonic examinations
Driven by the need to better define operational reliability of power generation equipment, boresonics has now become a fairly common and accepted practice within the rank and file of the utility industry. In general, boresonics involves the transportation of ultrasonic transducers through the rotor bore so as to search a given volume of material for flaws at different locations and orientations within a rotor forging. Boresonic inspection of steam turbine rotors primarily deals with the near bore region of the spindle forging. The central region of large ingot castings have contained the highest density of internal flaws.
Advantages:- Bore plug removal & reinstallation
- Visual inspections
- Power honing, mechanized grinding & polishing of bores
- Preliminary & final bore dimension measurements
- Magnetic particle examinations
- Automated ultrasonic testing
- On-site data review and recommendations.
For more information contact us.
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Quick testing of boilers
Boilers are inspected at regular intervals; this often means that it is necessary to erect scaffolding. For the extensive replacements of parts of boiler wall tubing, there is no real alternative as yet. Sometimes, however, this can be avoided by using specialized personnel to conduct inspections and make small repairs. KEMA provides these services on a routine basis. Especially with unplanned shutdowns, this can help prevent high costs. A visual inspection is usually combined with ultrasonic testing to measure the wall thickness. Computerized tabelizing yields clear insight into the corrosion pattern in the boiler and the severity of the crack.
Benefits:- No scaffolding necessary, saving outage time and cost
- Quick results on cause and extent of damage
- Recordable, tabelized results to support management decisions
- Trending possibility: two short (weekend) stops will yield accurate results as regards corrosion speed
- One-stop consultancy by KEMA in the field of corrosion and lifetime assessment.
For more information download the brochure below or contact us.
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[download] TOS 7082 NDT Quick boiler testing (.pdf 250 kb)
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Gas turbine blades inspection in a closed housing
Gas turbines can be fully opened for inspections. However, it is often possible to save the expense of disassembling the housing as well as the power outage time. Therefore, inspection holes are commonly integrated into the gas turbine housing. Once smaller linear flaw indications in blades or vanes are detected the discussion arises like:
- Is this something trivial?
- Is it a crack in the base material?
- Should we open the housing and find nothing?
- Should we continue operation and bare the risk?
The VINSPEC system enables us to provide you with the right answers. The inspection is conducted through the inspection holes (> 6 mm).
Benefits:- Nature and size of the indication can be established
- A clear decision can be made to open the gas turbine for a repair/replace or to leave it closed
- Trending possibility: crack progression monitoring
- You will be sure that the flaw indication is not just a trivial, superficial crack
- Possibility of rapid deployment around the world.
For more information download the brochure below or contact us.
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Gas turbine rotor inspection and fitness-for-purpose calculation
Gas turbine rotors may be susceptible to life limitations due to creep and/or fatigue. This may lead to critical cracking and catastrophic failure. Assessment of critical areas is necessary to determine opportunities for continued operation. KEMA can perform this Fitness-for-Purpose assessment and inspect rotors non-destructively with high reliability and at low cost.
Benefits:- Independent assessment on how to continue operation with a GT-rotor
- Reliable NDT results: less uncertainty
- Increased cost savings:
- Decrease of direct cost through cheaper inspection method
- Lifetime extensions of the rotor
- Deliberate postponement of investments
- One-stop shopping for both NDT testing and FfP evaluation.
For more information download the brochure below or contact us.
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