A standard I-in. Schedule 40 steel pipe carries saturated steam at 250°F, The pipe is Jagged…

A standard I-in. Schedule 40 steel pipe carries saturated steam at 250°F, The pipe is Jagged (insulated) with a 2-in. layer of 85 percent magnesia pipe covering, and outside this magnesia there is a ~-in. layer of cork, The inside temperature of the pipe wall is 249°F, and the outside temperature of the cork is 900F. Thermal conductivities, in Btujft-h-OF, are: for steel, 26; for magnesia, 0.034; for cork, 0.03. Calculate (a) the heat loss from l00 it of pipe in Btu per hour; (b) the temperatures at the boundaries between metal and magnesia and between magnesia and cork.

 

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