Search


Information
ICMST-Shenzhen 2016
Nov 1 - 4, 2016
Shenzhen, China
(EXIT THIS PAGE)
ICMST-Kobe 2014
Nov 2(Sun) - 5(Wed), 2014
Kobe, Japan
Nuclear Regulation Authority Outline of the New Safety Standards for Light Water Reactors for Electric Power Generation
For Public Comment
Outline of New Safety Standard (Design Basis)
For Public Comment
New Safety Standards (SA) Outline (Draft)
For Public Comment
Outline of New Safety Standard(Earthquake and Tsunami)(DRAFT)
Issues
 

Vol.8 No.1(May-25)
Vol.7 No.4(Feb-25)
Vol.7 No.3(Nov-25)
Vol.7 No.2(Aug-25)
Vol.7 No.1(May-25)
Vol.6 No.4(Feb-25)

< Other Issues

 

Occasional Topics
OTjapan Measures for Tsunami Striking Nuclear Power Station in Japan
Special Article: The Great Tohoku Earthquake (1)
OTjapan The Tragedy of “To Be” Principle in the Japanese Nuclear Industry
EJAMOT_CN3_Figure1_The_outside_view_of_CEFR OTChinaPlanning and Consideration on SFR R&D Activities in China
< All Occasional Topics

Featured Articles
EJAM7-3NT72 A New Mechanical Condition-based Maintenance Technology Using Instrumented Indentation Technique
EJAM7-3NT73 Survey robots for Fukushima Daiichi Nuclear Power Plant

JSM
Contacts
(EJAM): ejam@jsm.or.jp
(JSM): secretariat@jsm.or.jp
HP: http://www.jsm.or.jp
(in English)

 

Vol.8 No.1previousGA20-AA116-NT76-77

Academic Articles
Regular Paper Vol.8 No.1 (2016) p.1 - p.12
 

Measurement of Flow Accelerated Corrosion Rate at an Elbow Pipe and Combination Effect of an Upstream Orifice

 
Yoichi UTANOHARA1,*, Koichi KAMAHORI1, Akira NAKAMURA1, and Michio MURASE1
 
1Institute of Nuclear Safety System, Inc., 64 Sata, Mihama-Cho, Mikata-Gun, Fukui 919-1205, Japan
 
Abstract
Flow accelerated corrosion (FAC) rates at an elbow pipe with the diameter of D = 50 mm were measured by using corrosion sensors made of carbon steel. In addition, FAC rates at the elbow with an upstream orifice were measured to investigate the enhancement of FAC due to pipe geometries. The diameter ratio of the orifice was 0.5. The water temperature was 150 °C, the mean cross-sectional velocity was 4.98 m/s, the dissolved oxygen concentration was under 0.2 μg/kg, and pH was nearly neutral (about 7.0) at room temperature. The FAC rate was smaller at the intrados of the elbow pipe than at other circumferential locations due to low flow velocity near the inner surface. The ratio of the maximum FAC rate at the elbow pipe to the FAC rate in the straight pipe was about 3.7 without the upstream orifice and about 15.4 with the upstream orifice. This showed that the orifice significantly affected the FAC rate at the elbow pipe because of the short distance of 2.65D between the orifice and the elbow pipe.
 
Keywords
flow accelerated corrosion, elbow pipe, wall thinning rate, electric resistance method, orifice
 
Full Paper: PDF EJAM Vol.8 No.1 pp.1-12 "Measurement of Flow Accelerated Corrosion Rate at an Elbow Pipe and Combination Effect of an Upstream Orifice"















Article Information
Article history:
Received 18 January 2016
Accepted 30 March 2016