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<?xml-stylesheet type="text/xsl" href="https://communities.bentley.com/cfs-file/__key/system/syndication/rss.xsl" media="screen"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/"><channel><title>09. Why does the AutoPIPE Vessel calculate different wall thickness for a vertical vessel where one chamber is made with 2 sections of the same material?</title><link>https://communities.bentley.com/products/pipe_stress_analysis/w/pipe_stress_analysis__wiki/51127/09-why-does-the-autopipe-vessel-calculate-different-wall-thickness-for-a-vertical-vessel-where-one-chamber-is-made-with-2-sections-of-the-same-material</link><description /><dc:language>en-US</dc:language><generator>Telligent Community 12</generator><item><title>09. Why does the AutoPIPE Vessel calculate different wall thickness for a vertical vessel where one chamber is made with 2 sections of the same material?</title><link>https://communities.bentley.com/products/pipe_stress_analysis/w/pipe_stress_analysis__wiki/51127/09-why-does-the-autopipe-vessel-calculate-different-wall-thickness-for-a-vertical-vessel-where-one-chamber-is-made-with-2-sections-of-the-same-material</link><pubDate>Wed, 02 Aug 2023 10:52:58 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:dd775af8-2999-4628-ab57-85d0cf809144</guid><dc:creator>Tanaji Gaikwad</dc:creator><comments>https://communities.bentley.com/products/pipe_stress_analysis/w/pipe_stress_analysis__wiki/51127/09-why-does-the-autopipe-vessel-calculate-different-wall-thickness-for-a-vertical-vessel-where-one-chamber-is-made-with-2-sections-of-the-same-material#comments</comments><description>Current Revision posted to AutoPIPE Wiki by Tanaji Gaikwad on 8/2/2023 10:52:58 AM&lt;br /&gt;
&lt;h3&gt;&lt;span style="color:#993300;"&gt;&lt;strong&gt;Question:&lt;/strong&gt;&lt;/span&gt;&lt;/h3&gt;
&lt;p style="margin-left:30px;"&gt;I&amp;nbsp;am designing a vertical&amp;nbsp;vessel having one chamber&amp;nbsp;which has 2 sections of same material. The corrosion allowance , radiography etc. for the 2 sections are identical, there is no wind or seismic load. Why do I have slightly different thicknesses for the 2 shells? Also the heads attached to the 2 shells have different thicknesses.&lt;/p&gt;
&lt;p style="margin-left:60px;"&gt;&lt;strong&gt;&lt;span style="background-color:#008000;color:#ffffff;font-size:150%;"&gt;&lt;span style="font-size:x-large;"&gt;Answer: &lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/p&gt;
&lt;p style="margin-left:60px;"&gt;&lt;span style="color:#008000;"&gt;There are many reasons why the shells may have different thicknesses. In the above case specifically the reason for the different thickness is different hydrostatic pressure. When the thickness is calculated the applied pressure is design pressure + hydrostatic pressure.&lt;/span&gt;&lt;/p&gt;
&lt;p style="margin-left:60px;"&gt;&lt;span style="color:#008000;"&gt;In the above case the hydrostatic pressure for the lower section (31.05) is obviously more than upper section (31.06)&amp;nbsp;and then finally when the thickness round up of 1/16 in is applied, the final thickness turned out to be different. See the report below:&lt;/span&gt;&lt;/p&gt;
&lt;p style="margin-left:60px;"&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-41/58143.4.png"&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-41/pastedimage1598380202789v1.png" /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p style="margin-left:60px;"&gt;&lt;span style="color:#008000;"&gt;Also see the excel calculation details:&lt;/span&gt;&lt;/p&gt;
&lt;p style="margin-left:120px;"&gt;&lt;span style="color:#008000;"&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-41/02680.3.png"&gt;&lt;img alt=" " src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-41/pastedimage1598380202791v2.png" /&gt;&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;/p&gt;
&lt;p style="margin-left:60px;"&gt;&lt;span style="color:#008000;"&gt;Since the&amp;nbsp;program matches&amp;nbsp;the head thickness with the&amp;nbsp;associated&amp;nbsp;shell thickness, the head thicknesses also vary.&lt;/span&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: AutoPIPE Vessel, head, hydrostatic pressure, shell thickness&lt;/div&gt;
</description></item><item><title>09. Why does the AutoPIPE Vessel calculate different wall thickness for a vertical vessel where one chamber is made with 2 sections of the same material?</title><link>https://communities.bentley.com/products/pipe_stress_analysis/w/pipe_stress_analysis__wiki/51127/09-why-does-the-autopipe-vessel-calculate-different-wall-thickness-for-a-vertical-vessel-where-one-chamber-is-made-with-2-sections-of-the-same-material/revision/1</link><pubDate>Tue, 25 Aug 2020 18:29:34 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:dd775af8-2999-4628-ab57-85d0cf809144</guid><dc:creator>JamieP</dc:creator><comments>https://communities.bentley.com/products/pipe_stress_analysis/w/pipe_stress_analysis__wiki/51127/09-why-does-the-autopipe-vessel-calculate-different-wall-thickness-for-a-vertical-vessel-where-one-chamber-is-made-with-2-sections-of-the-same-material#comments</comments><description>Revision 1 posted to AutoPIPE Wiki by JamieP on 8/25/2020 6:29:34 PM&lt;br /&gt;
&lt;h3&gt;&lt;span style="color:#993300;"&gt;&lt;strong&gt;Question:&lt;/strong&gt;&lt;/span&gt;&lt;/h3&gt;
&lt;p style="margin-left:30px;"&gt;I&amp;nbsp;am designing a vertical&amp;nbsp;vessel having one chamber&amp;nbsp;which has 2 sections of same material. The corrosion allowance , radiography etc. for the 2 sections are identical, there is no wind or seismic load. Why do I have slightly different thicknesses for the 2 shells? Also the heads attached to the 2 shells have different thicknesses.&lt;/p&gt;
&lt;p style="margin-left:60px;"&gt;&lt;strong&gt;&lt;span style="background-color:#008000;color:#ffffff;font-size:150%;"&gt;&lt;span style="font-size:x-large;"&gt;Answer: &lt;/span&gt;&lt;/span&gt;&lt;/strong&gt;&lt;/p&gt;
&lt;p style="margin-left:60px;"&gt;&lt;span style="color:#008000;"&gt;There are many reasons why the shells may have different thicknesses. In the above case specifically the reason for the different thickness is different hydrostatic pressure. When the thickness is calculated the applied pressure is design pressure + hydrostatic pressure.&lt;/span&gt;&lt;/p&gt;
&lt;p style="margin-left:60px;"&gt;&lt;span style="color:#008000;"&gt;In the above case the hydrostatic pressure for the lower section (31.05) is obviously more than upper section (31.06)&amp;nbsp;and then finally when the thickness round up of 1/16 in is applied, the final thickness turned out to be different. See the report below:&lt;/span&gt;&lt;/p&gt;
&lt;p style="margin-left:60px;"&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-41/58143.4.png"&gt;&lt;img src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-41/pastedimage1598380202789v1.png" alt=" " /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p style="margin-left:60px;"&gt;&lt;span style="color:#008000;"&gt;Also see the excel calculation details:&lt;/span&gt;&lt;/p&gt;
&lt;p style="margin-left:120px;"&gt;&lt;span style="color:#008000;"&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-41/02680.3.png"&gt;&lt;img src="/resized-image/__size/320x240/__key/communityserver-wikis-components-files/00-00-00-00-41/pastedimage1598380202791v2.png" alt=" " /&gt;&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;/p&gt;
&lt;p style="margin-left:60px;"&gt;&lt;span style="color:#008000;"&gt;Since the&amp;nbsp;program matches&amp;nbsp;the head thickness with the&amp;nbsp;associated&amp;nbsp;shell thickness, the head thicknesses also vary.&lt;/span&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: AutoPIPE Vessel, head, hydrostatic pressure, shell thickness&lt;/div&gt;
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