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3 design and draw a circuit using the cascade system to operate two cylinders a and b which on the operation of a start valve produces
q use of high temperature material flare tipsa variety of high temperature alloys typically stainless steels andor nickel-base alloys are employed in
q what is expansion jointsexpansion joints are used to accommodate thermal growth in piping and pressure vessel applications the metal bellows an
q use of high temperature material in superheaterstypically superheaters and reheaters provide service lives of approximately 15 years ie half the
q high temperature materials in boilersa thin refractory layer between the shield and boiler tube is recommended in areas subject to moderate
q use of high temperature materials in furnacesoften furnace tubing and refractory protected membrane walls are fabricated from plain carbon steel
q applications of high temperature materialsa brief description of materials of construction used for common high temperature components in furnaces
q why we use nickel alloys in weldingnickel weld metals have high creep-rupture strength but often have lower stress-rupture ductility and lower
q use of stainless steels in weldingconsiderable care must be exercised to obtain sound crack-free welds these difficulties are pronounced when
q carbon and low alloy steels for weldingall welding of pressure retaining equipment must be completed as per the respective code typically ansiasme
cobalt-base super alloys eg uns r30155 grade 661 and r30816 grade 671 have superior strength to the nickel base alloys above 1800degf 980degcthe
q show general properties of castings1 fe-cr 10-30cr alloys offer good resistance to oxidation low strength at elevated temps restricted to use in
q material selection by temperature range 750deg to 1100degf 400deg to 600degc plain carbon steels are usually limited to a maximum operating
q describe polythionic acid corrosionalthough it is not typically thought of as high temperature corrosion polythionic acid stress corrosion cracking
q explain about napthenic acid corrosionsome crude oils contain napthenic acids which at elevated temperatures may contribute to more active
q what do you understand by carburizationcarburization is initiated by the adsorption of carbon in contact with the surface of the metal and may
q explain sulphidation processthe presence of sulphur converts the surface of the metal to a sulphide scale which is generally more destructive than
q define oxidation processoxidation is defined as a loss of electrons as when a metal goes from the metallic state to the corroded state when a
q environmental factors for high temperature service materialsmany environmental factors must also be considered when choosing a material for high
q overall deformation of a componentthe overall deformation of a component is a function of the applied load the materials creep rate the maximum
q expected service life of a component in high temperature environmentthe expected service life of a component in a high temperature environment is
q what is system prompton loading or switching to dos the screen displays c gt cgt a gt or a similar message the message displayed by dos is called
q mechanical properties of high temperature strength of metalsthe high temperature strength of metals is related to their melting points but many
q factors in the design of high temperature materialsthere is typically little correlation between room temperature strength and high temperature