https://communities.bentley.com/products/building/performance/w/building_performance__wiki/33154/gas-pipe-sizing-source-pressure-is-considered-when-calculating-velocityen-USTelligent Community 12https://communities.bentley.com/products/building/performance/w/building_performance__wiki/33154/gas-pipe-sizing-source-pressure-is-considered-when-calculating-velocityMon, 13 Mar 2017 12:09:33 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:64f8cff7-a3bd-4054-822a-32a6ad2ee41cDuncan Brownhttps://communities.bentley.com/products/building/performance/w/building_performance__wiki/33154/gas-pipe-sizing-source-pressure-is-considered-when-calculating-velocity#commentsCurrent Revision posted to Hevacomp Wiki by Duncan Brown on 3/13/2017 12:09:33 PM<br /> <table style="border:0px solid #dce5f0;background-color:#dce5f0;" border="0"> <tbody> <tr> <td style="text-align:right;"><strong>&nbsp;</strong></td> <td width="30%" style="text-align:right;"><strong>Product(s):</strong></td> <td>Hevacomp Mechanical Designer</td> <td></td> </tr> <tr> <td style="text-align:right;"><strong>&nbsp;</strong></td> <td style="text-align:right;"><strong>Version(s):</strong></td> <td>V8i (N/A)</td> <td></td> </tr> <tr> <td style="text-align:right;"><strong>&nbsp;</strong></td> <td style="text-align:right;"><strong>Environment:</strong></td> <td>N/A</td> <td></td> </tr> <tr> <td style="text-align:right;"><strong>&nbsp;</strong></td> <td style="text-align:right;"><strong>Area:</strong></td> <td>N/A</td> <td></td> </tr> <tr> <td style="text-align:right;"><strong>&nbsp;</strong></td> <td style="text-align:right;"><strong>Subarea:</strong></td> <td>N/A</td> <td></td> </tr> </tbody> </table> <h1>Overview</h1> <p>When calculating velocity for a pipe section, the source system pressure is considered.</p> <h1>Method</h1> <p>While the volume of a section is considered at atmospheric pressure, the gas is assumed to be compressed.</p> <p style="margin-left:30px;"><br />AdjustedFlowRate = Flowrate x 101325 &divide; (101325 + SystemPressure &divide; 100) &divide; 1000</p> <p style="margin-left:30px;">Velocity = 4000000 &times; (AdjustedFlowRate) &divide; pi &divide; dia &divide; dia</p> <p><a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-18/NewLogo.png"><img width="189" height="60" style="border-width:0px;" alt=" " src="/cfs-file.ashx/__key/communityserver-components-sitefiles/TSG-Logo.png" /></a></p><div style="clear:both;"></div>