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agitators

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Published: 01 June 2019
Fig. 6 The agitator bar, that fits on the end of the vacuum tube bar, is severely deformed. Two of the mixing plates are still on the bar, both are broken loose of the shaft. More
Image
Published: 01 June 2019
Fig. 1 Stub-shaft assembly, for agitator in a polyvinyl chloride reactor, that failed by ductile fracture. Top left: Configuration and dimensions (given in inches). Detail A: Sections through failure area showing original design, first revised design, and final design Element Chemical More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0047879
EISBN: 978-1-62708-234-1
... Abstract The stub-shaft assembly which was part of the agitator shaft in a polyvinyl chloride reactor, fractured in service after a nut that retained a loose sleeve around the smaller-diam section of the shaft had been tightened several times to reduce leakage. The shaft was made of ASTM A105...
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
... the agitator bar and the compounds being mixed. Heat, from either mechanical friction or the decomposition of sodium hydrosulfite in water, is all that was required to initiate the self-sustaining exothermic reactions with the material in the vessel. Our part on the accident team was to investigate...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001070
EISBN: 978-1-62708-214-3
..., supported in an angle iron framework, and were equipped with type 316L heating coils and agitators. After a few months of service, appreciable corrosion was noted, particularly on the coils under the point of acid addition and on the tips of the agitator. Neutralization tanks made of type 316L (UNS...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0091336
EISBN: 978-1-62708-234-1
... deposits of solid substances that sometimes collect just above the liquid level on a metal part that is partly immersed in an electrolyte. The deposits usually remain moist or are intermittently moist and dry. Where the liquid level fluctuates or where the liquid is agitated, the area of the metal...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001776
EISBN: 978-1-62708-241-9
.... The full solution of carbide in ASTM A128 grade B-4 is required to meet the following conditions: a solution temperature exceeding A cm by approximately 30–50 °C, soaking for 1–2 h per 25 mm of thickness at the temperature, and then quenching in agitated water. The speed of quenching is important...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0048714
EISBN: 978-1-62708-229-7
... (the condensate) was rapidly agitated by changes in direction at the metal surface and accelerated the impingement corrosion. This action and the low pH (4.5) of the condensate resulted in removal of the protective film that normally formed on the tube surface during initial corrosion and ultimately produced...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001604
EISBN: 978-1-62708-234-1
... localized and can, by mechanical action, remove weak portions of the metal. An increased SO 2 flow rate would produce turbulent conditions (agitation) and assist in minimizing this effect. However, the increased flow rate may have increased the rate of general corrosion and eventually led to tube failure...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003510
EISBN: 978-1-62708-180-1
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001097
EISBN: 978-1-62708-214-3
... is within the one-half to three-fourths hard range. The broken screws, along with screws of the same vintage and source, were subjected to examination. The broken screws were cleaned in acetone using ultrasonic agitation. In this instance, the screws had been employed to fasten a seven-hole narrow...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001075
EISBN: 978-1-62708-214-3
... microscope (SEM). Low-magnification optical observation showed all fracture surfaces were similar in appearance. Therefore, only three were selected for detailed examination. Samples were cleaned in acetone using ultrasonic agitation. Acknowledgment Papermaking 316L UNS S31603 Fatigue fracture...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001025
EISBN: 978-1-62708-214-3
... further examination. Areas selected were representative of two distinct regions visible on the fracture surface. Samples were cleaned before examination by using methanol and an ultrasonic agitator for 10 min. The C130 aircraft had landed and was taxiing toward its hangar. The aircraft was turning...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006816
EISBN: 978-1-62708-329-4
... Atmosphere control Quenching factors Quench temperature Reduces temperature gradients by providing slower quench Results in lower distortion Quench agitation Provides uniform heat transfer across all surfaces of the parts Provides adequate flow through workload Nonuniform...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001825
EISBN: 978-1-62708-241-9
... crack adjacent to the header, were examined by scanning electron microscopy (SEM). The SEM analysis was conducted both in the as-received condition and after successive cleaning in a detergent solution, acetone, and methanol using ultrasonic agitation and a soft-bristled brush. In conjunction...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001753
EISBN: 978-1-62708-241-9
...-ionized water at a temperature of 95 °C. The samples were left in the bath while being ultrasonically agitated for 30 min, with regular visual progress inspections throughout the process. The fracture surfaces (samples A–D), along with the polished metallographic mounts, were analyzed in the scanning...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006760
EISBN: 978-1-62708-295-2
... NOT to alter the original surface. Retain some of the contamination/corrosion product for later analysis. Agitation in an ultrasonic bath can help the cleaning process. Caution: Very soft materials may be damaged by the collapse of air bubbles adjacent to the part surface (cavitation). The sequence...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001808
EISBN: 978-1-62708-180-1
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
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
... preparation (mill scale, coatings surface finish, etc.), environmental composition (trace contaminants, dissolved gases, etc.), temperature, flow rate, solution concentration, and degree of agitation or aeration. In addition, corrosion product films and other changes in surface composition can also occur...