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Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001825
EISBN: 978-1-62708-241-9
...): ×100 Fig. 15 Microstructure and crack morphology in the base metal of the tube away from the header. Etchant: 10% oxalic acid (electrolytic). Magnification: ×100 Abstract A type 304 stainless steel tube that failed in a boiler stack economizer was analyzed to determine the cause...
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Published: 01 June 2019
Fig. 2 Feedwater economizer, finned tube harp assembly More
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Published: 01 June 2019
Fig. 14 Configuration & Economizer Note failures were at the bottom portion of the fins and cracking occurred under fin. More
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Published: 01 June 2019
Fig. 15 Water Side of Economizer Tube - Note cracks under fin area. 3.5×. More
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Published: 01 June 2019
Fig. 16 Metallographic Specimen Through Cracks in Economizer Tube - Note straight, transgranular, unbranched, oxidized cracks under fin. More
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Published: 01 June 2019
Fig. 1 Section of stainless steel tube/fin assembly removed from economizer. Note the weld geometry and fin weld locations. More
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Published: 01 June 2019
Fig. 2 Interior surface of economizer tube after penetrant testing. Note indications of cracking (arrows). More
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Published: 01 June 2019
Fig. 3 Inside-diameter cracking in stainless steel economizer tube. (a) Cross section of tube near the end of fin fillet weld. Note cracking at the root and toe of the weld. (b) Cross section of tube under unwelded fin end showing crack below fin and pitting on inside-diameter surface. (c More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c0047615
EISBN: 978-1-62708-230-3
... Abstract After ten years of satisfactory operation, economizer-tube failures occurred in a large black liquor recovery boiler for a paper mill. The economizer contained 1320 finned tubes. Two fins ran longitudinally for most of the tube length and were attached by fillet welding on one side...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001482
EISBN: 978-1-62708-229-7
... Abstract Penetration by molten copper occurred in the economizer of a large water-tube boiler. A cross section through a weld and the crack in the tube revealed a crack was an intergranular fissure. Small fissures of the same type also extended from its flanks. The main fissure was filled...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001609
EISBN: 978-1-62708-229-7
... of its resistance to chloride and sulfuric acid dewpoint corrosion under conditions potentially present in the HRSG low-pressure feedwater economizer. Intergranular corrosion and cracking were found in the weld metal and heat-affected zones. The hardness in these regions was up to 35 HRC, and the weld...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001457
EISBN: 978-1-62708-219-8
... Abstract The cover of a feed cock fitted to an economic boiler suddenly blew off and the plug lifted sufficiently to permit the escape of water. It was found that all four of the studs securing the cover had fractured. In each case fracture had occurred at the end of one of the screwed portions...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001569
EISBN: 978-1-62708-229-7
... Abstract This paper reviews several fatigue failures from the waterwall, superheater, and economizer portions of the boiler, their causes and how they were mitigated and monitored. Some cases required simple field modifications by cutting or welding, repair of existing controls, and/or changes...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0059924
EISBN: 978-1-62708-235-8
... was the most economical solution. Billets Nonmetallic inclusions Rings Ultrasonic testing 8822 UNS G88220 Metalworking-related failures The large steel ring shown in Fig. 1 was produced for a nuclear application from a 1.7 in (68 in.) diam billet of 8822 steel. The large billet was first...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001601
EISBN: 978-1-62708-235-8
... Abstract Flow forming technology has emerged as a promising, economical metal forming technology due to its ability to provide high strength, high precision, thin walled tubes with excellent surface finish. This paper presents experimental observations of defects developed during flow forming...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001642
EISBN: 978-1-62708-235-8
... economic times was from Saturday at midnight until Monday morning. Shutdown during the economic downturn lasted up to a week and a half. It is no wonder the parts contained temper carbides, developed heavy decarburization, and experienced excessive distortion. Any metallurgist familiar with basic...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006825
EISBN: 978-1-62708-329-4
...-diameter tubing (such as the water-wall, superheater, reheater, and economizer tubes) making up the heat-transfer surfaces. This article discusses the main types of failure that occur in steam-power-plant equipment, with major emphasis on the distinctive features of each type that enable the failure...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0047846
EISBN: 978-1-62708-218-1
... of operation, and the use of nitrided shafts became standard practice. Nitriding the shafts was more economical than restoring the slip clutch. Selected Reference Selected Reference • Fatigue Failures , Failure Analysis and Prevention , Vol 11 , ASM Handbook , ASM International , 2002 , p 700...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006754
EISBN: 978-1-62708-295-2
... improvement in durability and safety of products, equipment, or structures. Sometimes this analysis will lead to an improvement in economics as well. Understanding goes beyond knowledge of facts; it requires integration of facts into the knowledge base of an individual so that the facts may be transformed...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003518
EISBN: 978-1-62708-180-1
... component. If there is no other damage, it may be difficult to justify a prevention-oriented project. It may be more economical to live with a certain level of failure than to devote resources to prevention. The work is still worthwhile, because if certain economic situations change, there is background...