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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c9001568
EISBN: 978-1-62708-230-3
... Abstract Two suction rolls at the first press section of a 25 ft. wide paper machine developed cracks within two years of service. The rolls were austenitic stainless steel castings made of ASTM A 351 Grade CF8M alloy containing molybdenum. The rolls were exposed to slightly acidic white water...
Image
Published: 01 December 2019
Fig. 1 Schematic drawing of paper machine dryer section showing notes from actual inspection; large diameter rolls are dryer rolls; small diameter rolls are felt guide rolls More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c0048804
EISBN: 978-1-62708-230-3
... Abstract Several cases of failures in gray cast iron paper machine dryer rolls were evaluated. The rolls were found have ground outer cylindrical surfaces on which the paper web is dried. They were found to rotate about their longitudinal axes at speeds from 50 to 250 rpm while containing...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001050
EISBN: 978-1-62708-214-3
... in a paper-drying machine ruptured during normal operation. Applications Paper machines producing soft types of paper (tissue and toweling) or similar products utilize a single large Yankee dryer for final drying of the paper sheet. This Yankee dryer was internally Ceased with steam at 450 kPa (65...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001842
EISBN: 978-1-62708-241-9
... Fig. 1 Schematic drawing of paper machine dryer section showing notes from actual inspection; large diameter rolls are dryer rolls; small diameter rolls are felt guide rolls Fig. 2 Schematic drawing of felt guide roll in operation, showing nominal dimensions Fig. 3...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c0090276
EISBN: 978-1-62708-230-3
.... Recommendations included design changes in the head/shell joint, and detailed preventive maintenance inspection procedures were also suggested. Bolts Cracking (fracturing) Design Paper machines Pressure vessels Preventative maintenance Yankee dryer Cast iron (Other, general, or unspecified) fracture...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c9001565
EISBN: 978-1-62708-230-3
... resistant to SCC. The candidate materials are commercial grade unalloyed titanium or Inconel 600, which have superior resistance to SCC compared to austenitic stainless steels. Paper machines Piping Weld defects White liquor 304 UNS S30400 Joining-related failures Stress-corrosion cracking...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c9001564
EISBN: 978-1-62708-230-3
... Paper machines 316 UNS S31600 Stress-corrosion cracking Transgranular fracture An 8-inch diameter stainless steel black liquor feed pipe to a carbon steel digester had failed within 1 year of service. The material was type 316 molybdenum containing austenitic stainless steel. The service...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c9001562
EISBN: 978-1-62708-230-3
... was replaced with an Inconel clad carbon steel inlet cone to combat the SCC. Chlorides Inlet cones Paper machines 304L UNS S30403 Stress-corrosion cracking The Pandia digester is a long cylindrical vessel which uses alkaline sulfite liquor to cook sawdust for pulping. The cylindrical vessel...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c9001563
EISBN: 978-1-62708-230-3
.... As a corrective measure, a solid Inconel liner was recommended in the areas of direct steam impingement. Cladding Inlet cones Paper machines Inconel 600 UNS N06600 ASME SA212-B Intergranular corrosion Erosion - corrosion The Inconel clad carbon steel inlet cone failed in a localized area after 7...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c0091622
EISBN: 978-1-62708-230-3
.... If redesign was impossible, an alloy more resistant to Cl-SCC, such as a duplex stainless steel or a high-molybdenum (4 to 6%) austenitic stainless steel, should be used. Chlorides Digesters Paper machines CF-8M UNS J92900 Stress-corrosion cracking A CF-8M (cast type 316) neck liner or manway...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c9001567
EISBN: 978-1-62708-230-3
... treatment following fabrication and welding. Chlorides Evaporators Heat exchangers Paper machines 316L UNS S31603 Stress-corrosion cracking The falling film black liquor evaporator consisted of flat twin plate heat exchangers and were employed in several effects to increase the black liquor...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c0089567
EISBN: 978-1-62708-230-3
... and/or material quality from service. Casting defects Cold shuts Dryer heads Paper machines Stress concentration Gray iron Casting-related failures A paper-drier head manufactured from gray cast iron was removed from service as a result of nondestructive evaluation (NDE) detection of cracklike...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001243
EISBN: 978-1-62708-225-9
... months. The bearings are lubricated by a molybdenum sulfide paste. The operation conditions for this machine differ from others with longer .bearing life in that temperature differences are more pronounced and also thicker paper is compressed. Therefore it needed to be investigated whether corrosion...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001619
EISBN: 978-1-62708-225-9
... of the splines. SEM examination revealed the splined shaft failed by fretting fatigue. Fretting fatigue Paper machines Shafts (power) 4340 UNS G43400 Fretting wear Fatigue fracture Wood chips can be efficiently turned into fiber for newsprint manufacture by the process of disc refining...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001583
EISBN: 978-1-62708-217-4
... “Improper Machining” as the Major Cause Multiple crack initiation sites and very low fatigue cycles in the original testing indicate that something more happened than just incomplete hardening by about 0.5 HRC points lower in “C” than typical values shown in Table 3 of the original paper...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001601
EISBN: 978-1-62708-235-8
... Abstract Flow forming technology has emerged as a promising, economical metal forming technology due to its ability to provide high strength, high precision, thin walled tubes with excellent surface finish. This paper presents experimental observations of defects developed during flow forming...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001725
EISBN: 978-1-62708-229-7
... a paper to the Institution of Mechanical Engineers discussing the failures of two 100,000-kw. electric generators. An eight-page summary of this paper and the discussion was printed in Metal Progress in July 1956. Two of three units, built by his firm and installed in Toronto, had failed when the forged...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003519
EISBN: 978-1-62708-180-1
... shapes and sizes. They can be individual parts, entire machines, or a process. Broken down further, failures can be physical, paper, or thinking/cultural in origin. These possibilities expand the concept of a failure, because they introduce failures that can be touched and failures that cannot be touched...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001502
EISBN: 978-1-62708-234-1
... and the spur teeth), and tempered at 350 °F to a specified hardness of 55 HRC minimum on the hardened surface. Visual Examination Identification Markings None on either part; the markings were on the portion not returned. The part number had been submitted on the shipping papers. Physical...