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operating circulating system

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c0046242
EISBN: 978-1-62708-236-5
..., producing chips that eventually overstressed the gear, causing failure. Because the oil circulation system was not operating properly, metal chips were not removed from the coupling. Recommendations included checking the replacement coupling for residual magnetism and changing or filtering the pump oil...
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
... design minimum. Financial support was provided by Heatec. The authors wish to acknowledge the major contribution of Mr. W. A. Ledford and Mr. M. D. Moon in the conduct of the heat transfer calculations and understanding of the operation and design of the horizontal forced circulation vaporizer...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001082
EISBN: 978-1-62708-214-3
... base metal adjacent to the hub, leading to intergranular SCC in this highly stressed area. The impeller components appeared to have been operated at rev/min rates above their rating. In some instances, they were operated in damaged condition. In emergency situations, the circulating water system...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001828
EISBN: 978-1-62708-241-9
... the tests under controlled conditions. This paper deals with the failure of a bearing journal of a 6.7 mW HT pump under complex operating conditions that included a period of operation under two-phase flow conditions. A brief design description of the pump, its components, and the system in which...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001816
EISBN: 978-1-62708-180-1
... in adjacent tubes. The prolonged overheating was believed to have resulted from poor boiler circulation and high furnace temperatures. Rapid Overheating Rapid overheating frequently involves improper operation—specifically, delivering heat to the system more rapidly than the boiler or superheater heat...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001044
EISBN: 978-1-62708-214-3
... tested with plant air to determine whether there was a relationship between the maximum crack depth reported by eddy current testing and the capability of a tube to hold pressure. The maximum operating pressure differential that the tubes experienced in service due to circulating water pressure...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001311
EISBN: 978-1-62708-215-0
... year after new UNS N06600 superalloy tubes were installed. The heat exchanger operates continuously except when the black liquor side is cleaned biweekly by circulating 6% nitric acid at 60 °C (140 °F) and a pH of 1.5 to 2 for several hours. The pH levels of the black liquor and steam condensate...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001003
EISBN: 978-1-62708-227-3
... of the above. Ideally, these tests should have involved boiling, but because of the complexity of apparatus required to perform such tests at high temperatures and, therefore, high pressures, a simplified bomb system was used instead. Rods 2 in. long and 1 2 in. diam were drilled to provide...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001662
EISBN: 978-1-62708-236-5
... of sulphuric acid involved the use of direct-fired iron pots or steam heated evaporators with silicon iron tubes. Other systems used vacuum evaporating units lined with lead and acid resistant brick. However, with the more recent development of materials such as tantalum, zirconium, and reliable glass...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001370
EISBN: 978-1-62708-215-0
.... Recommendations included use of a case-hardened En 8 steel with the correct composition and regular maintenance of the pump. Cooling systems Nuclear reactors Shafts (power) Water cooling EN8 Fatigue fracture Corrosion fatigue Background After 7 years of operation, a service water pump...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001396
EISBN: 978-1-62708-229-7
... and other impedances to smooth flow within the boiler tubes. At such locations, the collection of sludge circulating in the system is facilitated with the concomitant possibility of the development of subsequent corrosion or overheating. In respect of water treatment the phenomenon of on-load corrosion...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003568
EISBN: 978-1-62708-180-1
.... This form of attack frequently occurs in condenser systems handling seawater or brackish water that contains entrained air or solid particles and circulates through the system at relatively high velocities and with turbulent flow. The pits are elongated in the direction of flow and are undercut...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001817
EISBN: 978-1-62708-180-1
... raisers. A 455-mm (18-in.) diam, 7.9-mm ( 5 16 -in.) wall carbon steel discharge line for a circulating-water system at a cooling tower fractured in service; a manifold section cracked where a Y-shaped connection had been welded. The steel pipe was made to ASTM A 53 specifications...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001682
EISBN: 978-1-62708-229-7
..., is fabricated from austenitic stainless steel and contains piping, valves, a main pump, two heat exchangers, and expansion joints. The heat generated during nuclear operations is transferred from the heavy water to the secondary cooling water system through the heat exchangers. The secondary cooling water...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001313
EISBN: 978-1-62708-215-0
... The generator air cooler tube was one of eight cooler units at a hydroelectric power station. The unit had operated for approximately 49,000 h. The cooling medium for the tubes is water from a river. Air flows over the finned exterior of the tubes, while water circulates through the tubes. Circumstances...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001314
EISBN: 978-1-62708-215-0
... of the vaporizer in the system ( Fig. 1 ). The vaporizer was thermally cycled depending upon demand of the system, typically cycling 2 to 4 times per hour during normal operation. After the second and third attempts to bring the system on line, studies were done to determine cause for failure. The most complete...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006795
EISBN: 978-1-62708-295-2
... effects of erosion have caused problems in a number of industries. In the power-generation industry, erosion damage has occurred to boiler tubes and waterwalls ( Ref 2 – 16 ), steam turbines ( Ref 17 – 19 ), land-based gas turbines ( Ref 20 – 22 ), solids-transport systems ( Ref 16 , 23 – 27 ), cyclones...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001826
EISBN: 978-1-62708-241-9
...Abstract Abstract A back wall riser tube in a high pressure boiler failed, interrupting operations in a cogeneration plant. The failure occurred in a tube facing the furnace, causing eight ruptured openings over a 1.8 m section. The investigation consisted of an on-site visual inspection...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001713
EISBN: 978-1-62708-220-4
... include: (1) a leak, from the water jacket into the mixing vessel through a flaw or crack in the stainless steel shell, (2) a leak at a seal or another joint through which water circulates in the blender, (3) water introduced during a cleaning operation and not removed prior to charging the vessel, (4...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003555
EISBN: 978-1-62708-180-1
... , Chem. Eng. , Vol 93 ( No. 1 ), ( 6 Jan 1986 ) 16. Lai G.Y. , Proceedings in High Temperature Corrosion of Energy Systems , Rutman M.F. , Ed., The Metallurgical Society , 1980 , p 45 17. Verma K.M. , Ghosh H. , and Rai J.S. , Br. Corros. J. , Vol 13...