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vent pipe

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001146
EISBN: 978-1-62708-229-7
... Abstract A metallurgical failure analysis was performed on pieces of the cracked vent header pipe from the Edwin I. Hatch Unit 2 Nuclear power plant. The analysis consisted of optical microscopy, chemical analysis, mechanical Charpy impact testing, and fractography. It was found that the...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001832
EISBN: 978-1-62708-241-9
... purge ventilation system designed to continuously remove hydrogen gas and vapors without letting radionuclides escape. Several intergranular cracks were discovered in the vent pipe of one such system. The pipe, made of galvanized steel sheet, connects to an exhaust fan downstream of high-efficiency...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001171
EISBN: 978-1-62708-219-8
... attributed to the permanence of the stagnant water. The iron sexquioxide layers, deposited on the internal pipeline surface, are an evidence of it ( Fig. 1 ). Fig. 1 Transverse welding seam (internal side). 0.4 × The pipe specimen shown in Figs. 2 and 1 was cut from a pipeline system for...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001149
EISBN: 978-1-62708-232-7
... Abstract A large diameter steel pipe reinforced by stiffening rings with saddle supports was subjected to thermal cycling as the system was started up, operated, and shut down. The pipe functioned as an emission control exhaust duct from a furnace and was designed originally using lengths of...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001010
EISBN: 978-1-62708-229-7
... generator producing 80 t/h of steam at 400°C and 41 kPa. On two previous occasions there have been leakages, one at the connection to the soot blower pipe, the other at the connection to the vent. In the present case failure took place once more at the connection from the collector to the vent line used...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001275
EISBN: 978-1-62708-215-0
... stopped for down-stream maintenance. This greatly reduces the need for valve installations and eliminates the venting of large quantities of gas to clear a pipe prior to maintenance. The pipe had been in service four years before it was squeeze-clamped to stop the flow of gas and permit the replacement...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001594
EISBN: 978-1-62708-229-7
... Abstract Nuclear power plants typically experience two or three high-cycle fatigue failures of stainless steel socket-welded connections in small bore piping during each plant-year of operation. This paper discusses fatigue-induced failure in socket-welded joints and the strategy Texas...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003507
EISBN: 978-1-62708-180-1
... discusses the types of imperfections that can be traced to the original ingot product. These include chemical segregation; ingot pipe, porosity, and centerline shrinkage; high hydrogen content; nonmetallic inclusions; unmelted electrodes and shelf; and cracks, laminations, seams, pits, blisters, and scabs...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003556
EISBN: 978-1-62708-180-1
... Abstract This article focuses on the mechanisms of microbially induced or influenced corrosion (MIC) of metallic materials as an introduction to the recognition, management, and prevention of microbiological corrosion failures in piping, tanks, heat exchangers, and cooling towers. It discusses...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006788
EISBN: 978-1-62708-295-2
... Abstract This article focuses on the mechanisms of microbiologically influenced corrosion as a basis for discussion on the diagnosis, management, and prevention of biological corrosion failures in piping, tanks, heat exchangers, and cooling towers. It begins with an overview of the scope of...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001647
EISBN: 978-1-62708-235-8
... porosity Crater pipes—improper Elongated porosity arc extinguishing Irregular weld appearance Welding speed too high Random distribution of porosity Arc blow Inconsistent bead shape relating to a “wandering” arc Venting gas Elongated/tubular porosity Random distribution of porosity...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006796
EISBN: 978-1-62708-295-2
... of the bent pipe was approximately 150 mm (6 in.), and the thickness was 7.1 mm (0.28 in.). The details of the piping geometry and flow conditions of the vent line are summarized in Table 5 . The mechanism of LDI erosion is known to be caused by impingement of a highly accelerated steam flow (280 m...
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
... hydrogen embrittlement metallurgical discontinuities pressure vessel stress raisers stress rupture stress-corrosion cracking welding PRESSURE VESSELS, piping, and associated pressure boundary items of the types used in nuclear and conventional power plants, refineries, and chemical-processing...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003508
EISBN: 978-1-62708-180-1
... those of gates, vents, etc. Broken casting (at gate, riser, or vent) E 230: Fractured casting with oxidized fracture E 231 Fracture appearance indicates exposure to oxidation while hot Early shakeout Incorrect Dimensions or Shape F 100: Incorrect dimensions; correct shape...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001578
EISBN: 978-1-62708-233-4
... occurred when the backside chamfer cut was made. This observation suggests that the problem may have originated when the tooling bar was under tension rather than in compression. A large pipe (37 in. diameter) at a refinery had levels of vibration over 4.0 in./s on an end cap that was located after an...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006783
EISBN: 978-1-62708-295-2
... external circuit. Thus, if dissimilar pipes are butt welded with the electrolyte flowing through them, the most severe corrosion will occur immediately adjacent to the weld on the anodic member. The geometry of the circuit elements determines the electrical potential gradient, which causes the...
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
... feedwater economizer harp assembly consisted of an upper and lower header made of 200 mm (8 in.) outside diameter (OD), 8.1 mm (0.322 in.) thick, 4.6 m (15 ft) long pipe connecting two staggered rows of 30 finned tubes each, which were 50 mm (2 in.) OD, 3.0 mm (0.120 in.) thick, and 18.3 m (60 ft) long. A...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003548
EISBN: 978-1-62708-180-1
... pipes are butt welded with the electrolyte flowing through them, the most severe corrosion will occur adjacent to the weld on the anodic member. The geometry of the circuit elements determines the electrical potential gradient, which causes the current to flow. Because galvanic corrosion...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006782
EISBN: 978-1-62708-295-2
... surface textures. The type and extent of on-site sampling depends on the environment and its availability. Piping corrosion in a domestic water service would require water samples from the source (incoming water supply) and from the end use (e.g., a faucet). Microbiologically influenced corrosion can...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003533
EISBN: 978-1-62708-180-1
... pumps) attached to the gun continue to operate while the sample chamber is vented to atmosphere. These features are standard for field emission and LaB 6 guns and add extra complexity (and cost) to these systems. Separate pumps and an isolated gun chamber are often omitted from tungsten thermionic SEMs...