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superheater tubes

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080359
EISBN: 978-1-62708-304-1
... surface. Courtesy of Welding Services Inc. Fig. 13.19 Results of corrosion probe tests for T-22 in the lower superheater region for 840 h in a boiler. Source: Ref 46 Fig. 13.20 T-11 superheater tube sample showing severe corrosion attack after 6 months of operation. Source: Ref 31...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430409
EISBN: 978-1-62708-253-2
.... It describes life assessment methods based on hardness, wall thickness, scale formation, microstructure, and creep. It also includes a case study on the determination of the residual life of a secondary superheater tube. References References 8.1 Viswanathan R. , Paterson S.R. , Grunloh...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080335
EISBN: 978-1-62708-304-1
... (280) 3.63 (143) Type 310 7.77 (306) … Source: Ref 33 Wastage rates for the carbon steel tube and the alloy 625 overlay tube in a side-by-side test as part of a finishing superheater in a boiler in New York Table 12.7 Wastage rates for the carbon steel tube and the alloy 625...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080321
EISBN: 978-1-62708-304-1
... 625 (1160) Sodium vanadic vanadate, 5Na 2 O·V2O4 ·11V 2 O 5 535 (995) Source: Ref 6 Chemical compositions (wt%) of the deposits formed on the superheater tubes in a boiler when fired with fuel oils with different concentrations of vanadium Table 11.4 Chemical compositions (wt...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430325
EISBN: 978-1-62708-253-2
... undergoes oxidation, creating a wedge effect at the crack tip. Failure due to thermal fatigue is found in waterwall tubes or such other areas of the boiler that are subjected to departure from nucleate boiling or rapidly fluctuating flow conditions. It is also observed in superheaters subjected...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430314
EISBN: 978-1-62708-253-2
... and also at the furnace corners. The first tubes adjacent to the soot blower opening are the most affected hit areas. Soot blower erosion can also occur around the economizers, superheaters, and reheaters on account of the carryover of wet steam or fly ash in these areas. Typical reasons for soot...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080259
EISBN: 978-1-62708-304-1
... of the reheater (538 °C, or 1000 °F steam) for 3½ years in a 255 MW(e) subcritical boiler, which burned high chlorine coal (about 0.3%), showing slight pitting attack. The 304H reheater tubes exhibited a typical 4 year life. Courtesy of Welding Services Inc. Fig. 10.90 Alloy 72 overlay superheater tubes...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430149
EISBN: 978-1-62708-253-2
..., (a) 400×, (b) 1000× Fig. 6.38 SEM micrograph showing coalescence of creep cavities along the grain boundaries, 5000× Fig. 6.36 Close-up views of a superheater tube at the failure location Fig. 6.39 Close-up view at the failure location. The rupture is in the form of a fish...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430343
EISBN: 978-1-62708-253-2
... such as hydrazine are used along with volatile amines including hydroquinones, hydroxylamines, and ketones to keep dissolved oxygen typically below 5 ppb in an AVT program. No nonvolatile solids are permitted when AVT is implemented. Case Study 34—Characterization of the Scale Formed in Superheater Tubes...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430290
EISBN: 978-1-62708-253-2
... of Na 2 SO 4 vapors, which then condense together with fly-ash particles on the pendant superheater and reheater tubes (i.e., in the hot section of the boiler). Similarly, in the case of oil-fired boilers, the combustion products of fuel oil contain sulfur, typically as Na 2 SO 4 . Sulfate salts...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430351
EISBN: 978-1-62708-253-2
... to thermal degradation, and the scaling temperature. Alloy steels are superior to plain carbon steels in this respect. Inadvertent use of plain carbon steel in superheater and reheater sections instead of alloy steels is a classic case of wrong material selection. Forming defects very rarely cause tube...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430107
EISBN: 978-1-62708-253-2
... of grains with a certain grain size number or grain diameter; see Fig. 5.2 . Fig. 5.2 Grain size measurement on final superheater tube sample The area/volume percent or area/volume fraction of various phases in a microstructure has an equally great influence on the properties of a material...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490383
EISBN: 978-1-62708-340-9
... Temperature Corrosion Characteristics of Superheater Tubes, Ishikawajima Harima Industries , Engg. Rev. , Vol 16 ( No. 4 ), Oct 1983 44. Plumley A.L. and Roczmiac W.R. , Coal Ash Corrosion Field Testing of Advanced Boiler Tube Materials , in Proceedings of the Second International...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.9781627083041
EISBN: 978-1-62708-304-1
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.9781627082532
EISBN: 978-1-62708-253-2
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430204
EISBN: 978-1-62708-253-2
...Abstract Abstract This chapter discusses the effects of corrosion on boiler tube surfaces exposed to water and steam. It describes the process of corrosion, the formation of scale, and the oxides of iron from which it forms. It addresses the primary types of corrosion found in boiler...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490183
EISBN: 978-1-62708-340-9
... methods (a) Primary failure mechanism (b) Secondary superheater:     Outlet header X X ABCHEFK 123     Tube bank(s) X G   1237     Inlet header X EHK 123     Attemperator CF 125     Connection piping X X GM 123 Reheater/superheater:     Outlet header(s...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430017
EISBN: 978-1-62708-253-2
..., after it has left the boiler drum, is heated above its saturation temperature. The steam from the drum passes to the superheater coils placed in the flue gas path. The superheater coils may consist of one or more stages of tube banks arranged to effectively transfer heat from the flue gases. Here, steam...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.9781627083409
EISBN: 978-1-62708-340-9
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080003
EISBN: 978-1-62708-304-1
... with a corrosion-resistant alloy cladding on the outer diameter have long been available for construction of waterwalls as well as superheaters in boilers. Composite tubes manufactured by a spiral weld overlaying process have been made available in recent years. These composite tubes use the outer diameter...