Extension of steam drum inspection intervals
Detect in-service defects by automated ultrasonic steam drum inspections from the outside while leaving the drum internals in place
In most countries, authorities require a periodic visual/magnetic inner surface inspection of power plant pressure vessels such as steam drums. Especially in the case of larger drums the removal and reinstalling of their internals puts these inspections on the critical path of the plant's outage. For about 20 years, KEMA has been conducting automated ultrasonic steam drum inspections from the outside.
To detect defects in constructions, ultrasonic testing is a useful tool. Especially in-service grown defects, often resulting in cracking, can be handled this way. Conventional ultrasonic testing is, however, not very reliable as to crack sizing. The Time Of Flight Diffraction (TOFD) method provides this possibility.
The resulting reduction of outage time turns out to be a major benefit for plant owners!
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