scholarly journals Flow Induced Localized Corrosion of Carbon Steel Tube in Boiler Feed Water

1993 ◽  
Vol 42 (5) ◽  
pp. 331-333
Author(s):  
Masanobu Matsumura
Keyword(s):  
Carbon Steel ◽  
Steel Tube ◽  
Localized Corrosion ◽  
Feed Water ◽  
Boiler Feed Water

scholarly journals Effect of Film Forming Amine on Flow Accelerated Corrosion of Carbon Steel in Boiler Feed Water of Power Plants

2019 ◽  
Vol 68 (4) ◽  
pp. 98-104
Author(s):  
Shota Yamazaki ◽  
Masaki Yoshida ◽  
Yusuke Suetake ◽  
Kazuo Marugame ◽  
Li-Bin Niu
Keyword(s):  
Carbon Steel ◽  
Power Plants ◽  
Feed Water ◽  
Accelerated Corrosion ◽  
Film Forming ◽  
Flow Accelerated Corrosion ◽  
Boiler Feed Water

Fitness-for-Service Assessment of an Injection Point in a Boiler Feed-Water Line Subjected to Corrosion

2018 ◽  
Author(s):  
Takuyo Kaida ◽  
Masahiro Sasaki ◽  
Luis Alejandro Baldomir Gutierrez
Keyword(s):  
Practical Method ◽  
Localized Corrosion ◽  
Metal Loss ◽  
Feed Water ◽  
Piping System ◽  
Injection Point ◽  
Internal Corrosion ◽  
Water Line ◽  
Plant Shutdown ◽  
Boiler Feed Water

When inspecting a piping system, injection points should receive specific attention because they are sometimes subject to accelerated or localized corrosion. If metal loss is found at the location of such injection points during the inspection, a Fitness-For-Service (FFS) assessment can be used to evaluate whether the component can continue to operate safely without a plant shutdown. A more practical method for assessing the integrity is needed to provide specific procedures for the FFS assessment of a piping branch, e.g., an area-replacement rule. This paper will present a practical example of an FFS assessment of an injection point in a boiler feed-water line in which internal corrosion was found using ultrasonic testing. We outline a way to characterize the metal-loss shape and assess the integrity of the injection point. We also present a quill-type injection design as a permanent countermeasure.

Improvement of Integrity Concepts for NPP Primary Circuit Piping

2008 ◽  
Author(s):  
Alexey Arzhaev ◽  
Sergey Butorin
Keyword(s):  
Carbon Steel ◽  
General Scheme ◽  
Primary Circuit ◽  
Feed Water ◽  
Outer Diameter ◽  
Intergranular Stress Corrosion ◽  
Methodology Development ◽  
Integrity Assessment ◽  
Piping Systems ◽  
Steel Piping

Operating NPPs license extension activities in Russia produced strong demand for safety improvement of plants build according to earlier standards. Installation of additional supports as pipe whip restraints is one of requirement in acting regulatory documentation which should be followed or compensated by appropriate measures like Leak Before Break (LBB) analyses and improvement of In-Service Inspection (ISI) and Leak Detecting System (LDS). Basic document for LBB concept application to Russian NPP piping is RD 95 10547-99. Its requirements correspond to classical LBB principles used in many countries in Europe, USA and Japan. In many real cases requirements of RD 95 10547-99 could not be applied to safety important NPP piping systems due to the presence of specific features of operational degradation due to some corrosion mechanisms: for example, erosion-corrosion (E-C) for carbon steel piping and intergranular stress corrosion cracking (IGSSC) for heat affected zones of austenitic piping weldments. For special case of RBMK piping with outer diameter 325 mm (potentially susceptible to IGSCC) special Break Preclusion Concept has been developed in Russia after IAEA Extrabudgetary Program in 2000–2002. Contrary to LBB Concept demanding for all four basic principles to be completely fulfilled BP Concept accepts some principles to be fulfilled in a balanced way with demonstration of monitored degradation effectively achieved in operation. Special BP Concept is being developed now to support integrity assessment of RBMK carbon steel steam and feed water piping potentially susceptible to E-C which requires another set of measures to demonstrate principle of controlled degradation in operation then in case of austenitic steel piping. General scheme of piping integrity analyses according to LBB and BP Concepts is discussed and examples of specific approaches to achieve controlled degradation are illustrated in paper. As result of LBB and BP Concepts application it is possible to substantiate reject of additional piping whip restraints implementation on-site. Examples of similar safety methodology development in other countries have been reported at IAEA Specialists Meeting on LBB in Kiev, Ukraine in November 2006.

Gas chromatographic determination of residual hydrazine and morpholine in boiler feed water and steam condensates

1994 ◽  
Vol 38 (7-8) ◽  
pp. 456-460 ◽  
Author(s):  
S. Vatsala ◽  
V. Bansal ◽  
D. K. Tuli ◽  
M. M. Rai ◽  
S. K. Jain ◽  
...  
Keyword(s):  
Chromatographic Determination ◽  
Feed Water ◽  
Boiler Feed Water

Production Process and Heat Transfer Performance of 10/316 Clad Tube

2014 ◽  
Vol 1081 ◽  
pp. 270-274
Author(s):  
Zui Xian Yu ◽  
Xue Sheng Wang ◽  
Qin Zhu Chen
Keyword(s):  
Heat Transfer ◽  
Stainless Steel ◽  
Heat Transfer Coefficient ◽  
Carbon Steel ◽  
Transfer Coefficient ◽  
Heat Transfer Performance ◽  
Steel Tube ◽  
Stainless Steel Tube ◽  
Transfer Performance ◽  
Clad Tube

A new preparation technique of carbon steel/stainless steel clad tube was introduced, and the contact surface was well combined. Meanwhile, with the using of tube heat exchanger, the experiment on the heat transfer performance of the clad tube was done. Comparing the 10/316 clad tube and the 316 stainless steel tube, the effects on the heat transfer performance of 316 stainless steel tube attached to carbon steel was evaluated. It is showed that overall heat transfer coefficient of 10/316 clad tubes is higher than that of stainless steel tube. The average heat transfer coefficient of 10/316 clad tubes is about 18.7%~34.4% higher than that of stainless steel tube. Experimental investigation indicates that, by brazing and cold drawing, the 10/316 clad tube was well combined and the thermal conductivity was better than that of stainless steel tube.

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