Hoop stress - Oil Refinery Corrosion and Materials Issues Forum

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Discussion Forums - The Hendrix Group

4/16/2004 9:00 AM

Joined: 1/1/0001

Posts: 0

Hoop stress

Hello, It may be a very basic question, please bear with me and help me. What is the importance of Hoop stress in piping design. What is the (hoop stress) limit considered while designing new and calculating the retiring thickness of old process piping & Heater tubes. Some where I have seen 20% of SMYS or something but not sure. Thanks for your time Mparasuraman

4/20/2004 9:00 AM

Joined: 1/1/0001

Posts: 0

RE: Hoop stress

MParasuraman: "Hoop" stress is the material stress in the meridianal direction in a cylindrical body under internal pressure. Hoop stress in a pipe is typically computed from a modified Barlow's equation which relates hoop stress to the internal pressure, diameter and thickness, i.e., S = (PXD)/2t. It is used in design codes to limit the hoop stress as a percentage of the tensile or yield stress of a metal or alloy. Hope this helps! David Hendrix The Hendrix Group Inc.

6/1/2004 9:00 AM

Joined: 1/1/0001

Posts: 0

RE: Hoop stress

By designing point of view streses are classified into three types i.e. 1. Hoop Stresses (circumferetial) 2.Longitudnal Stresses (along the length) 3.Radial Stresses(in radial direction) Among these Hoop stresses being the maximum are used for designing of pipes and other two as they have less stress value are neglected. Share the knowledge

7/2/2004 9:00 AM

Joined: 1/1/0001

Posts: 0

RE: Hoop stress

MP, Classical "hoop stress" is incorporated into the piping design codes (ASME B31.1 and B31.3) in the equations used to select piping system wall thickness. The calulation of wall thickness is affected by the: maximum operating pressure, pipe diameter, material selected and corrosion allowance. I suggest that you visit/repost your questions on www.eng-tips.com Your question is not strictly corrosion related.... MJC

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