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A 6 in. schedule 80 steel pipe (OD=6.62 in.) will be used to transport 450◦F steam...

A 6 in. schedule 80 steel pipe (OD=6.62 in.) will be used to transport 450◦F steam from a boiler house to a new process unit. The pipe will be buried at a depth of 3 ft (to the pipe centerline). The soil at the plant site has an average thermal conductivity of 0.4 Btu/h · ft · ◦F and the minimum expected ground surface temperature is 20◦F. Estimate the rate of heat loss per foot of pipe length for the following cases:

(a) The pipe is not insulated.

(b) The pipe is covered with a 2-in. thick layer of magnesia insulation. Neglect the thermal resistance of the pipe wall and the contact resistance between the insulation and pipe wall.

Ans. (a) 350 Btu/h · ft of pipe. (b) 160 Btu/h · ft of pipe.

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