Published March 2021 | Version v1
Journal article Metadata-only

High-efficiency and high-precision ultrasonic testing technologies for complex shaped blade grooves for maintenance of steam turbine rotor

Creators

  • 1. Mitsubishi Heavy Industries, Ltd., Research & Innovation Center, Service Engineering Department, Takasago, Hyogo (Japan)
  • 2. Mitsubishi Power, Ltd., Power Systems Service Headquarters, Nagasaki Power Systems Service Department, Nagasaki (Japan)
  • 3. Mitsubishi Power Industries Co., Ltd., Service Division, Steam Turbine Department, Yokohama, Kanagawa (Japan)
  • 4. Mitsubishi Heavy Industries Compressor Corporation, HSE and Quality Management Department, Hiroshima (Japan)
  • 5. Mitsubishi Heavy Industries Compressor Corporation, Customer Service Division, Hiroshima (Japan)

Description

The low-pressure stage of a steam turbine rotor has the potential risk of blade scattering caused by stress corrosion cracking in the blade groove where the rotor blade is implanted due to long-term operation. Mitsubishi Heavy Industries (MHI) Group has developed ultrasonic testing technologies for axial entry blade grooves with a complicated processing shape that is used to detect and identify minute stress corrosion cracking occurring in the blade groove that can be used without removing the rotor blade. This report presents an overview and inspection examples of ultrasonic testing techniques that can handle special blade groove processing shapes and disk shapes. (author)

Availability note (English)

Available from https://www.mhi.co.jp/technology/review/en/abstracte-58-1-100.html

Abstract (Japanese)

蒸気タービンロータの低圧段においては,長期運転に伴い動翼を植込む翼溝部での応力腐食割れ発生による動翼飛散のリスクが潜在している。当社グループでは,加工形状が複雑となるアキシャルエントリー型の翼溝部に対して,動翼を抜き取らずに翼溝部に生じる微細な応力腐食割れを検出・識別するための超音波探傷技術を開発している。本報では特殊な翼溝加工形状やディスク形状にも対応できる超音波検査技術の概要及び検査事例を紹介する。(著者)

Additional details

Additional titles

Original title (Japanese)
蒸気タービン保全における複雑形状翼溝部の高効率・高精度超音波探傷技術

Identifiers

URL
https://www.mhi.co.jp/technology/review/en/abstracte-58-1-100.html;

Publishing Information

Journal Title
Mitsubishi Juko Giho
Journal Volume
58
Journal Issue
1
Series
雑誌名:三菱重工技報
Journal Page Range
p. 1-6
ISSN
0387-2432

INIS

Country of Publication
Japan
Country of Input or Organization
Japan
INIS RN
53069663
Subject category
S42: ENGINEERING;
Descriptors DEI
CORRELATIONS; CRACKS; DEFECTS; IN-SERVICE INSPECTION; POWER PLANTS; REAL TIME SYSTEMS; ROTORS; SENSORS; STEAM TURBINES; STRESS CORROSION; THERMAL FATIGUE; TURBINE BLADES; ULTRASONIC TESTING
Descriptors DEC
ACOUSTIC TESTING; CHEMICAL REACTIONS; CORROSION; EQUIPMENT; FATIGUE; INSPECTION; MACHINERY; MATERIALS TESTING; MECHANICAL PROPERTIES; NONDESTRUCTIVE TESTING; TESTING; TURBINES; TURBOMACHINERY

Optional Information

Notes
2 refs., 10 figs.