Question: a 4in schedule 80 steel pipe id 14 3826 in...
A 4-in. schedule 80 steel pipe (ID 1⁄4 3.826 in., OD 1⁄4 4.5 in.) carries a heat-transfer fluid at 600F and is covered with a 1/2 -in. thick layer of pipe insulation. The pipe is surrounded by air at 80F. The vendor’s literature states that a 1-in. thick layer of the pipe insulation has an R-value of 3. Neglecting convective resistances, the resistance of the pipe wall, and thermal radiation, estimate the rate of heat loss from the pipe per foot of length.
Could it be clear so the formulas can be recognize