Chemical Engineering Basics
Salvage value is the most flexible criteria for analysing a financial investment. 'Salvaging' means

Disposing off a machine/property on as is where is basis
Disposing off machine/property, which is no longer useful in the present scenerio
Mortgaging the obsolete machine/property
Writing off the obsolete machine/ property

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Chemical Engineering Basics
What is the effect on the performance of the economiser in the thermal power plant boiler, if the feed water temperature is very low due to preheaters being out for repairs or starving of steam supply ?

Economiser tube life increases due to handling of low temperature water
Scale formation rate on economiser tubes increases
Heat transfer efficiency of economiser increases due to picking up high heat from the flue gases
It results in corrosion due to the condensation on the flue gas side of the economiser tubes due to handling of low temperature water

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