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Jet pumps

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0091659
EISBN: 978-1-62708-229-7
... Abstract Jet pumps, which have no moving parts, provide a continuous circulation path for a major portion of the core coolant flow in a boiling water reactor. Part of the pump is held in place by a beam-and-bolt assembly, wherein the beam is preloaded by the bolt. The Alloy X-750 beams had been...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001575
EISBN: 978-1-62708-217-4
... Abstract An oil scavenge pump was found to have failed when a protective shear neck fractured during the start of a jet engine. Visual inspection revealed that the driven gear in one of the bearing compartments was frozen as was the corresponding drive gear. Spacer wear and thermal...
Image
Published: 15 January 2021
Fig. 45 Schematic of boiling water nuclear reactor. Red arrows identify the jet pumps located between the reactor vessel and the reactor core. Source: Ref 28 More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0089722
EISBN: 978-1-62708-217-4
... Abstract A welded elbow assembly (AISI type 321 stainless steel, with components joined with ER347 stainless steel filler metal by gas tungsten arc welding) was part of a hydraulic-pump pressure line for a jet aircraft. The other end of the tube was attached to a flexible metal hose, which...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001116
EISBN: 978-1-62708-214-3
... to Failure The pipe was obtained from a distributor to replace an old string in a well. The well was a hydraulically jet pumped well about 1800 m (6000 ft) deep that produced oil, water, and gas. The gas was sour and the H 2 S content of the gas in the pump separator at the surface was about 10,000 ppm...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001779
EISBN: 978-1-62708-241-9
... were identified in depth of the pits by micro crack due to the stress, which had been produced by plastic deformation ( Fig. 8b ). These sorts of cracks could appear because of extra forces, which were applied to the surface by cavitation agents (e.g., smash, water jet, etc.). The impact force...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003569
EISBN: 978-1-62708-180-1
... in the clearance escapes at high speed under radial action of the shaft due to firing load. This type of cavitation takes place in the lower half of the bearing. High-speed oil jet, leading to a drop of pressure, can produce cavities, and their collapse can cause damage on the adjacent surface. Flow Instability...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003570
EISBN: 978-1-62708-180-1
..., cavities in contact with or very close to a solid surface collapse asymmetrically; one portion of the cavity boundary folds inward, forming a jet of liquid directed toward the solid ( Ref 1 ). A consensus of theoretical modeling and experimental measurements is that microjets achieve velocities up to about...
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
..., as in a jet or rotary pump, vapor bubbles collapse at high-pressure areas and destroy the protective film on the metal surface or disrupt the metal itself. Cavitation erosion occurs typically on rotors or pumps, on the trailing faces of propellers and of water turbine blades, and on the water-cooled side...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003567
EISBN: 978-1-62708-180-1
... by Slurry Jet Method , Kagaku Ronbunshu , Vol 14 , 1988 , p 161 – 166 23. Blatt W. , Kohley T. , Lotz U. , and Heitz E. , The Influence of Hydrodynamics on Erosion-Corrosion in Two-Phase Liquid-Particle Flow , Corrosion , Vol 45 ( No. 10 ), 1989 , p 793 – 804 24...
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
... to extremely low-pressure areas, as in a jet or rotary pump, vapor bubbles collapse at high-pressure areas and destroy the protective film on the metal surface or disrupt the metal itself. Cavitation erosion occurs typically on rotors and pumps, on the trailing faces of propellers and of water turbine...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001023
EISBN: 978-1-62708-214-3
.... The wear had been caused by incorrect machining of the shaft splines, which prevented the bevel gear nut from locating correctly against the gear. Aerospace engines Aircraft components Bevel gears Drives Engine components Jet planes Military planes Splines 16 NCD 13 Fretting wear...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006794
EISBN: 978-1-62708-295-2
... corrosive wear of materials include pin-on-disc, slurry-pot erosion, slurry-jet erosion, and cavitation-corrosion tests ( Fig. 4 ), which simulate different corrosive wear conditions. Figure 4(a) schematically illustrates a pin-on-disc tester in accordance with ASTM G 99 ( Ref 27 ) for evaluating abrasion...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006789
EISBN: 978-1-62708-295-2
... is the progressive alteration or loss of material from a solid surface by liquid jets produced by collapsing bubbles in a liquid. When a bubble collapses, fluid rushes in to fill the void created by the bubble collapse, and these “jets” of liquid can produce very significant pressures on solid surfaces. These high...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006817
EISBN: 978-1-62708-329-4
... of these questions. Its approach to these questions is the result of 40 years of work in the field of physical asset management. History of Reliability-Centered Maintenance In the late 1950s, the commercial aviation industry of the United States began to put its first jet airliners, the Boeing 707...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006785
EISBN: 978-1-62708-295-2
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003504
EISBN: 978-1-62708-180-1
... to these questions is the result of 40 years of work in the field of physical asset management. History of RCM <xref rid="a0003504-ref2" ref-type="bibr">(Ref 2)</xref> In the late 1950s, the commercial aviation industry of the United States began to put its first jet airliners, the Boeing 707 and the Douglas...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006810
EISBN: 978-1-62708-329-4
... stresses, with engine crankshafts and pump shafts as typical examples. Apart from wear by bearings, which can be a major contributor to shaft failure (see the section “Wear” in this article), the most common cause of shaft failure is metal fatigue. Fatigue is a weakest-link phenomenon; hence, failures...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006864
EISBN: 978-1-62708-395-9
... ( Fig. 2 ). The drive motor is primarily responsible for turning the screw(s). Additional drive motors are responsible for rotation of melt pumps, pullers, winders, and cutters and are often supplied as a component part of the additional units. One commonality of the extruder drive motors, regardless...
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
... ) and numerical simulation of a single droplet impinging on a solid wall ( Ref 7 ). The time-series images indicate the generation of a shock wave and side jetting ( Fig. 1b ), which are followed by propagation of the shock wave normal to the solid wall in the droplet ( Fig. 1c ) and reflection of the shock wave...