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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001526
EISBN: 978-1-62708-229-7
... Abstract In Nov. 1998, the west superheater outlet header at an electricity generating plant began to leak steam. Subsequent investigation revealed the presence of a crack that extended for 360 deg around the full circumference of the header and through the full cross-sectional thickness...
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Published: 01 June 2019
Fig. 1 This is the 5-ft. long section cut from the west superheater outlet header in tube rows number 4 through 7. Subsegments of row 4 are referred to as A1, A2, A3, etc. More
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Published: 01 June 2019
Fig. 1 Interligament cracking in a failed secondary superheater outlet header from a boiler. More
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Published: 01 June 2019
Fig. 1 Cracking in the superheater outlet header associated with the longitudinal weld seam. More
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Published: 01 June 2019
Fig. 2 Schematic diagram of Shawville 3 SH outlet header, with boat sample locations indicated. More
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Published: 30 August 2021
Fig. 53 Interligament cracking in a failed secondary superheater outlet header from a boiler More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0048845
EISBN: 978-1-62708-229-7
... welds in the secondary superheater outlet headers (constructed of SA335-P11 material) of a major boiler were described as an example. The OD of the header was measured to detect the amount of swelling and found to have increased 1.6% since its installation. Ligament cracks extending from tube seat...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0060154
EISBN: 978-1-62708-234-1
... Abstract One of the coils in the radiant section of a primary reformer furnace used in an ammonia plant was found leaking. The bottom of one of seven outlet headers (made of ASME SA-452, grade TP316H, stainless steel) was revealed during examination to be ruptured. It was revealed...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0048318
EISBN: 978-1-62708-234-1
... Abstract A resistance-welded carbon steel superheater tube made to ASME SA-276 specifications failed by pitting corrosion and subsequent perforation, which caused the tube to leak. The perforation was found to have occurred at a low point in a bend near the superheater outlet header...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001669
EISBN: 978-1-62708-229-7
... outlet temperature of 566 deg C, the 11.4 cm thick header had operated for approximately 187,000 h at the time of the failure. Discussion focuses on the results of a metallographic examination of boat samples removed from the longitudinal seam weldment in the vicinity of the failure and at other areas...
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Published: 01 June 2019
Fig. 2 Microstructure, linked voids, and split grain boundaries in the failed outlet header shown in Fig. 1 . 400x More
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Published: 30 August 2021
Fig. 54 Microstructure, linked voids, and split grain boundaries in the failed outlet header shown in Fig. 53 . Original magnification: 400× More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c9001590
EISBN: 978-1-62708-228-0
... close to the outlet header. The location is indicated on Fig. 1 . Fig. 3 Skid-mounted hydrogen production units, Belgium The crack was in the heat-affected zone of the weld and had developed parallel to the weld (along the fusion line). The crack appeared to be brittle. A micrograph...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001688
EISBN: 978-1-62708-234-1
... the design called for ( 2 ). Superheater Header Stub Failures Failures had occurred in the stubs connecting the outlet header to the superheater tubes in a steam generator. The steam temperature at outlet was nominally 515°C and they had been in service for some 175,000 h. Because there was extensive...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001341
EISBN: 978-1-62708-215-0
..., and two tube rows were changed to SB 407 alloy 800H from alloy 800. The superheater ( Fig. 1 ) includes inlet and outlet headers at the top, with tubes suspended from these headers. The assembly is one of several exchangers suspended in an exhaust flue downstream of a methanol reformer. The internal coil...
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
... a bypass system or a recirculation system that partially redirects water from its outlet back to its inlet. This helps maintain the CT exhaust gas temperature flowing over the harps and maintains temperatures above the acid dewpoint temperature. The addition of a recirculation system causes a minor...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001328
EISBN: 978-1-62708-215-0
... Intergranular oxidation Mechanical properties Thermal stresses Tubing Weldments Incoloy 800H UNS N08810 Intergranular fracture Background Maintenance shutdown inspections regularly showed cracks in the welded outlet pigtail connections of a steam-methane reformer furnace. Applications...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c9001638
EISBN: 978-1-62708-228-0
... not as strong as the cast alloys, possessed greater ductility and thermal shock resistance and became the alloy of choice for furnace outlet connections, transfer lines, and headers. It is widely used for these components in ethylene plants throughout the world. 4 While materials that are more resistant...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001686
EISBN: 978-1-62708-220-4
... was wound in a right-hand helix with a coil centerline diameter of approximately two meters. There were 24 3 4 total loops in the coil with the majority of the loops being tight wound and final three loops at the outlet end of the vaporizer being loose wound. The coil was design to ASME Code...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001818
EISBN: 978-1-62708-180-1
... Hydrotesting A 150-cm (60-in.) inside-diameter boiler drum fabricated of 18-cm (7-in.) thick ASTM A515, grade 70, steel failed during final hydrotesting at a pressure of approximately 26 MPa (3.8 ksi). The shock wave from the vessel rupture also damaged several connected headers and piping runs...