Qu espesor de aislante con una conductividad de 0.06 Btu/h ft F debe agregarse a la tubera de 8 in, numero 140 (acero) donde circula vapor de agua para que la temperatura exterior del aislante no exceda los 250 F. El vapor fluye a 800 F y una velocidad de 10,000 lb_m/h.

What thickness of insulation with a conductivity of 0.06 Btu/h ft F should be added to the 8-in, number 140 (steel) pipe where steam is circulated so that the outside temperature of the insulation does not exceed 250 F? Steam flows at 800F and a velocity of 10,000 lbm/h.