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Control valves

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Published: 01 June 2019
Fig. 2 Thrust control valve bolts failed because of hydrogen embrittlement. More
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Published: 01 December 2019
Fig. 14 Simplified engineering drawing of thermostatically controlled valve, showing position of cracking More
Image
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 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
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...
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
...Working condition of wellhead flow control valve body Table 1 Working condition of wellhead flow control valve body Maximum working pressure 1100 psi Maximum working temperature 90 °C Natural gas H 2 S content 3.6% Natural gas CO 2 content 1.02% Chloride content...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001296
EISBN: 978-1-62708-215-0
... imported for tail plane pitch control. Valve failure introduces a great risk of fire, which may endanger the safety of the aircraft by the escape of fuel to hot zones around the engine bay. The part was reportedly machined to its entire length by conventional machining—except for two sets of elongated...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c0046505
EISBN: 978-1-62708-219-8
... of the contact area was by ductile (transgranular) fracture. Recommendations included changing the latch material from malleable iron to silicon bronze (C87300). The use of silicon bronze prevents corrosion or galvanic attack and proper adjustment of the latch maintains an adequate contact area. Control...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0048733
EISBN: 978-1-62708-235-8
..., the operators immediately went to the control room and found that the steam-temperature valve that admits steam to the brine heater was secured. However, the chart indicated that the brine temperature was 60 °C (140 °F) and that the pressure in the steam supply had increased. The steam valve was immediately...
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
...) regions were significantly less than those in the casting material (by an approximate factor of 2 to 2.5). This work was performed under the auspices of the U.S. Nuclear Regulatory Commission. Acknowledgments Control valves Cooling systems Cooling water Hydraulic valves Leakage Nuclear...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001727
EISBN: 978-1-62708-225-9
... is complicated because several mechanisms operate simultaneously or sequentially. For example, a structural component in a space launch vehicle can be simultaneously subjected to stress, a marine environment, and complex fatigue loads and frequencies. A series of bolts on thrust control valves for a Titan...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0092148
EISBN: 978-1-62708-235-8
... Abstract Occasional failures were experienced in spool-type valves used in a hydraulic system. When a valve would fail, the close-fitting rotary valve would seize, causing loss of flow control of the hydraulic oil. The rotating spool in the valve was made of 8620 steel and was gas carburized...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0045992
EISBN: 978-1-62708-225-9
... Abstract After two weeks of operation, a poppet used in a check valve to control fluid flow and with a maximum operating pressure of 24 MPa (3.5 ksi) failed during operation. Specifications required that the part be made of 1213 or 1215 rephosphorized and resulfurized steel. The poppet...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001123
EISBN: 978-1-62708-214-3
... control procedure. Selected References Selected References • Forms of Corrosion , Failure Analysis and Prevention , Vol 11 , ASM Handbook , ASM International , 2002 , p 761 – 795 10.31399/asm.hb.v11.a0003548 • Lampman S. , Intergranular Fracture , Failure Analysis...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001001
EISBN: 978-1-62708-229-7
... by corrosion deposits at their tips. The failure suggests control of dissolved solids in the boiler feedwater may have been inadequate. Boilers Corrosion products Superheater headers 2.25Cr-1Mo Thermal fatigue fracture Corrosion fatigue Examination of the header of the third superheater...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003503
EISBN: 978-1-62708-180-1
... as inputs and produces hot water as an output; flue gases and heat leakage are also produced as waste outputs. The water temperature is regulated by the controller opening and closing the main gas valve (labeled stop valve) when the temperature of the water in the tank goes outside the preset limits of 60...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0048169
EISBN: 978-1-62708-233-4
... Abstract A valve-seat retainer spring (made of 0.23 mm thick 17-7 PH stainless steel) from a fuel control on an aircraft engine was found to be broken after 3980 h of service. The two inner tabs were found to be broken off. The part was revealed to be in relative rotation against its contacting...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001010
EISBN: 978-1-62708-229-7
... component. In this particular case, control of dissolved solids in the boiler feedwater may have been inadequate. Steam collectors Superheaters Carbon steel Pitting corrosion Stress-corrosion cracking Figure 1 shows the arrangement of the outlet from a superheater in a generator producing...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001812
EISBN: 978-1-62708-241-9
... was not obscured by a layer of cadmium Fig. 23 SEM of metallographic section showing secondary intergranular cracks filled with cadmium. Inset shows EDS spectrum for the lighter areas Fig. 14 Simplified engineering drawing of thermostatically controlled valve, showing position of cracking...