Answered: Saturated steam at 2.6 kgf/cm2 flows…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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4 Saturated steam at 2.6 kgf/cm2 flows through a steel pipe in the NPS 8” - sch 40 standard. The pipe is 1 km long. The ambient temperature is usually around 25ºC in the region, the pipeline is located in an environment where much wind action is not expected and the internal convective coefficient of the pipeline is negligible. Consider the convective coefficient for the environment to be 10 W / m2 ºC. The conductivity of the carbon steel in question is 46.2 W/m K. In this case, the outer surface of the pipe would be too high (check this with beads). It is desired to keep the external surface of the pipe at a maximum of 50ºC, for safety reasons for the operating personnel. The insulation will be calcium silicate, with an estimated effective conductivity of 0.045 kcal/h m ºC. In this case, insulation thickness of at least___________ mm would be recommended and a positive effect of the insulation would also be the saving of _____________% of the thermal energy of the steam, which would be without the insulation lost to the atmosphere

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