Maintenance of gas turbines

Impact and implications for NDT

Pertti Auerkari, Jorma Pitkänen, Mikko Pihkakoski, Liisa Muurinen, Markku Kemppainen, Pekka Kangas, M. Kemppainen, P. Kangas

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

Abstract

Gas turbines and particularly their hot path components exhibit relatively high maintenance cost and short in-service inspection cycles, in comparison with most main components of thermal power plants. The overall share of production capacity covered by gas-fired combined cycle and CHP plants utilising gas turbines is still increasing, and the short inspection and maintenance cycles suggest corresponding strong growth for NDT services. NDT of gas turbine components is typically specified for three different purposes: within the shop during different phases of manufacturing or repairs, for user acceptance of new or reconditioned components, and for in-service assessment on the run/repair/replace decisions. The most demanding inspections in many ways are those performed in the field, as the available methods and access for the inspections can be fairly limited. Majority of the field inspections apply visual and surface techniques, but also ET and UT appear to find increasing use as they provide the potential advantage of indicating flaw depth. Examples are shown on in-service and ex-service inspections of hot-end components, particularly turbine blades and vanes.
Original languageEnglish
Pages (from-to)568-571
JournalInsight: Non-Destructive Testing and Condition Monitoring
Volume44
Issue number9
Publication statusPublished - 2002
MoE publication typeA1 Journal article-refereed

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Nondestructive examination
Gas turbines
Inspection
Turbine components
Repair
Turbomachine blades
Power plants
Gases
Defects
Costs

Cite this

Auerkari, P., Pitkänen, J., Pihkakoski, M., Muurinen, L., Kemppainen, M., Kangas, P., ... Kangas, P. (2002). Maintenance of gas turbines: Impact and implications for NDT. Insight: Non-Destructive Testing and Condition Monitoring, 44(9), 568-571.
Auerkari, Pertti ; Pitkänen, Jorma ; Pihkakoski, Mikko ; Muurinen, Liisa ; Kemppainen, Markku ; Kangas, Pekka ; Kemppainen, M. ; Kangas, P. / Maintenance of gas turbines : Impact and implications for NDT. In: Insight: Non-Destructive Testing and Condition Monitoring. 2002 ; Vol. 44, No. 9. pp. 568-571.
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abstract = "Gas turbines and particularly their hot path components exhibit relatively high maintenance cost and short in-service inspection cycles, in comparison with most main components of thermal power plants. The overall share of production capacity covered by gas-fired combined cycle and CHP plants utilising gas turbines is still increasing, and the short inspection and maintenance cycles suggest corresponding strong growth for NDT services. NDT of gas turbine components is typically specified for three different purposes: within the shop during different phases of manufacturing or repairs, for user acceptance of new or reconditioned components, and for in-service assessment on the run/repair/replace decisions. The most demanding inspections in many ways are those performed in the field, as the available methods and access for the inspections can be fairly limited. Majority of the field inspections apply visual and surface techniques, but also ET and UT appear to find increasing use as they provide the potential advantage of indicating flaw depth. Examples are shown on in-service and ex-service inspections of hot-end components, particularly turbine blades and vanes.",
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Auerkari, P, Pitkänen, J, Pihkakoski, M, Muurinen, L, Kemppainen, M, Kangas, P, Kemppainen, M & Kangas, P 2002, 'Maintenance of gas turbines: Impact and implications for NDT', Insight: Non-Destructive Testing and Condition Monitoring, vol. 44, no. 9, pp. 568-571.

Maintenance of gas turbines : Impact and implications for NDT. / Auerkari, Pertti; Pitkänen, Jorma; Pihkakoski, Mikko; Muurinen, Liisa; Kemppainen, Markku; Kangas, Pekka; Kemppainen, M.; Kangas, P.

In: Insight: Non-Destructive Testing and Condition Monitoring, Vol. 44, No. 9, 2002, p. 568-571.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Maintenance of gas turbines

T2 - Impact and implications for NDT

AU - Auerkari, Pertti

AU - Pitkänen, Jorma

AU - Pihkakoski, Mikko

AU - Muurinen, Liisa

AU - Kemppainen, Markku

AU - Kangas, Pekka

AU - Kemppainen, M.

AU - Kangas, P.

PY - 2002

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N2 - Gas turbines and particularly their hot path components exhibit relatively high maintenance cost and short in-service inspection cycles, in comparison with most main components of thermal power plants. The overall share of production capacity covered by gas-fired combined cycle and CHP plants utilising gas turbines is still increasing, and the short inspection and maintenance cycles suggest corresponding strong growth for NDT services. NDT of gas turbine components is typically specified for three different purposes: within the shop during different phases of manufacturing or repairs, for user acceptance of new or reconditioned components, and for in-service assessment on the run/repair/replace decisions. The most demanding inspections in many ways are those performed in the field, as the available methods and access for the inspections can be fairly limited. Majority of the field inspections apply visual and surface techniques, but also ET and UT appear to find increasing use as they provide the potential advantage of indicating flaw depth. Examples are shown on in-service and ex-service inspections of hot-end components, particularly turbine blades and vanes.

AB - Gas turbines and particularly their hot path components exhibit relatively high maintenance cost and short in-service inspection cycles, in comparison with most main components of thermal power plants. The overall share of production capacity covered by gas-fired combined cycle and CHP plants utilising gas turbines is still increasing, and the short inspection and maintenance cycles suggest corresponding strong growth for NDT services. NDT of gas turbine components is typically specified for three different purposes: within the shop during different phases of manufacturing or repairs, for user acceptance of new or reconditioned components, and for in-service assessment on the run/repair/replace decisions. The most demanding inspections in many ways are those performed in the field, as the available methods and access for the inspections can be fairly limited. Majority of the field inspections apply visual and surface techniques, but also ET and UT appear to find increasing use as they provide the potential advantage of indicating flaw depth. Examples are shown on in-service and ex-service inspections of hot-end components, particularly turbine blades and vanes.

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Auerkari P, Pitkänen J, Pihkakoski M, Muurinen L, Kemppainen M, Kangas P et al. Maintenance of gas turbines: Impact and implications for NDT. Insight: Non-Destructive Testing and Condition Monitoring. 2002;44(9):568-571.