Journal Title : International Journal of Modern Trends in Engineering and Science

Author’s Name : R Prakash | P Shanmugavel

Volume 02 Issue 07  Year 2015

ISSN no: 2348-3121

Page no: 15-18

Abstract Pipe bends in a piping system have considerably added flexibility than other components and repeatedly absorbing large loads and thermal expansions in service conditions. Pipe bends are considered to be the critical components of the piping system, and hence it is necessary to predict their response precisely. It is also useful for safe design purposes, to have accurate and conservative estimates of the limit loads, beyond which the structure of the pipe bend undergoes excessive plastic deformation. The tolerability of pipe bends is based on the induced level of shape imperfection. The bend section may be a potential source of damage during service, particularly in the cases where significant ovality and wall thickness variation (thinning/thickening) exist. Ovality may be defined as the deformation of round pipe into an elliptical shape or symmetrical flattening of a round pipe. Hence the acceptability of pipe bends depends on the magnitude of these shape irregularities (Ovality and thickening/thinning) induced during the manufacturing process. This project work aims at treating the out- of- plane  moment  load  combined   with   internal pressure to study the effects of various shape  irregularities  in inlet pigtail pipe bend Incoloy 800  ASTM  B407 material used in hydrogen reformer applications. Pro-E WILDFIRE 5.0 software is used to model the geometries and ANSYS 1 3. 0 is used to analyze the long radius pipe bend and stand-alone pipe bend with flanges.The pipe bend corresponds to 40 Schedule and 250 mm constant bend radius of Nominal pipe diameter 32mm. The pipe bends are treated under a combined internal pressure of  2.65 MPa  and a moment.

Keywords— Stress Analysis; Pipe bending; Hydrogen Reforming; Process Line


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