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valve body

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Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001375
EISBN: 978-1-62708-215-0
... Abstract Three sprinkler system dry pipe valve castings (class 30 gray iron), two that had failed in service and one that had been rejected during machining because of porosity, were submitted for examination. The two failures consisted of cracks in a seating face. All three were from the same...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001820
EISBN: 978-1-62708-241-9
... of failure and provide preventive measures. The valve body was made of A216-WCC cast carbon steel. Its inner surface was covered with cracks stemming from surface pits. Investigators concluded that the failure was caused by a combination of hydrogen-induced corrosion cracking and sulfide stress-corrosion...
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Published: 01 December 2019
Fig. 1 Wellhead flow control valve body, 3″ID 2500# A216-WCC, the body carries sour gases with a high wet H 2 S content (24,000 ppm). The maximum working pressure is 1100 psi More
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Published: 01 December 1992
Fig. 1 Schematic of 150mm (6in.) gate valve body. More
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Published: 01 December 1992
Fig. 17 Finite-element models. (a)“As built” flange-to-valve body juncture with bolt load from torqued studs (in increments of approximately 91 70 kPa, or 133- psi). (b)“Corroded at fracture” flange-to-valve body juncture with bolt load from torqued studs (in increments of approximately 10,600 More
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Published: 01 December 1993
Fig. 2 Dealuminized area from valve body More
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Published: 15 January 2021
Fig. 57 Photograph of brass valve body fracture surface. Courtesy of F. Hossain and V.-A. Ulcickas, Massachusetts Materials Research, Inc. More
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Published: 15 January 2021
Fig. 58 Scanning electron microscopy images of brass valve body fracture surface. Arrows indicate crack branches. Courtesy of F. Hossain and V.-A. Ulcickas, Massachusetts Materials Research, Inc. More
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Published: 01 December 2019
Fig. 2 A cross section of wellhead flow control valve body inside entry More
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Published: 01 December 2019
Fig. 3 Severe corrosion on the inner surface of the control valve body, ( a ) near the seat ring, ( b ) near the valve’s flange More
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Published: 01 December 2019
Fig. 4 A cross section of valve body base metal after 3 years of service in wet H 2 S environment. ( a ) Crack emanating from inner surface of the valve’s surface, ( b ) holes and cracks near central zone of the valve, ( c ) surface of the valve’s flange, there is a clear evidence More
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001071
EISBN: 978-1-62708-214-3
... kPa (150 psi) and 120 deg C (250 deg F) maximum in 93 to 99% sulfuric acid. The fracture originated at stress-corrosion cracks that occurred in a high-stress transition region at the valve body-to-flange juncture. The mechanical properties of the failed valve were below those of the manufacturer's...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001329
EISBN: 978-1-62708-215-0
... fitting and two ASME SB-148 CA 954 valve bodies) and an entire valve assembly. The leaks were found to be in the socket-weld crevice area and had resulted from dealloying. It was recommended that the weld joint geometry be modified. Control valves Cooling systems Cooling water Hydraulic valves...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0091358
EISBN: 978-1-62708-233-4
... dispensed a discolored drink with a sulfide odor, causing complaints from customers. Manufacturing specifications called for the valve body to be made of type 303 stainless steel, a free-machining steel chosen because of the substantial amount of machining necessary to make the parts. Other machine parts...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001558
EISBN: 978-1-62708-217-4
... Abstract A liquid hydrogen main fuel control valve for a rocket engine failed by fracture of the Ti-5Al-2.5Sn body during the last of a series of static engine test firings. Fractographic, metallurgical, and stress analyses determined that a combination of fatigue and unexpected aqueous stress...
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Published: 01 January 2002
in the similar valve bodies. (a) Crack indicated by dye-penetrant inspection in bore of valve. 1×. (b) Crack relative to the inlet and outlet ports. 1.25×. (c) Fatigue striation found on the fracture surface. 7000× More
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Published: 30 August 2021
for similar valve bodies. (a) Crack indicated by dye-penetrant inspection in the bore of the valve. Original magnification: 1×. (b) Crack relative to the inlet and outlet ports. Original magnification: 1.25×. (c) Fatigue striation found on the fracture surface. Original magnification: 7000× More
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Published: 01 December 2019
Fig. 6 Typical example of hydrogen induced corrosion cracks extended parallel to the inner surface of the valve body ( a ) OM micrograph, ( b ) SEM micrograph More
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001373
EISBN: 978-1-62708-215-0
... of the pressure relief part of the second valve. Unetched. 315× Sample sections were then taken from the threaded cylinder port and from various surfaces of the valve body. Chrome-plated and non-chrome-plated surfaces, both internal and external, were examined. Dezincification was observed in both valves...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003512
EISBN: 978-1-62708-180-1
..., then the life assessment results will not accurately assess the part or structure. For example, Fig. 8 shows a defect that was found in the radius of a gate valve stem ( Ref 27 ). In the gate valve stem, the failure analyst determined that a preexisting forging defect was present at the radius. Because other...