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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/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/" xmlns:wfw="http://wellformedweb.org/CommentAPI/"><channel><title>PRV with a control node</title><link>https://communities.bentley.com/products/hydraulics___hydrology/f/haestad-hydraulics-and-hydrology-forum/248270/prv-with-a-control-node</link><description>How can I use a pressure reducing valve in the hydraulic model controlling the pressure at a control node? In water supply systems, we often automate valves to communicate with a critical point, instead of controlling the outlet pressure (pressure to</description><dc:language>en-US</dc:language><generator>Telligent Community 12</generator><item><title>RE: PRV with a control node</title><link>https://communities.bentley.com/thread/775686?ContentTypeID=1</link><pubDate>Mon, 31 Jul 2023 16:23:44 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:0e415160-7ea1-4f8f-84b7-a455d03600c1</guid><dc:creator>Jesse Dringoli</dc:creator><description>[quote userid="1359086" url="~/products/hydraulics___hydrology/f/haestad-hydraulics-and-hydrology-forum/248270/prv-with-a-control-node/775512"]This article is exactly what I&amp;#39;m talking about. However, it explains the problem but does not explain a solution.[/quote]
&lt;p&gt;The article&amp;nbsp;proposes a possible workaround to address this situation and explains why it may not be practical to have this in a real system.&lt;/p&gt;
[quote userid="1359086" url="~/products/hydraulics___hydrology/f/haestad-hydraulics-and-hydrology-forum/248270/prv-with-a-control-node/775512"]&lt;span&gt;The only part that leads to a solution is this part: &amp;quot;&lt;em&gt;you can develop a relationship between demand in the zone and TCV setting&lt;/em&gt;&amp;quot;. I understand that there is no solution for what happens on the operation. It talks about a PLC but&amp;nbsp;doesn&amp;#39;t show how I represent this in the model.&lt;br data-uw-rm-sr="" /&gt;&lt;br data-uw-rm-sr="" /&gt;&lt;/span&gt;Can I only do this with a &amp;quot;trick&amp;quot; using TCV?[/quote]
&lt;p&gt;The article is based on advice that our Dr. Tom Walski provided, to help another user a few years ago, here: &lt;a href="/products/hydraulics___hydrology/f/haestad-hydraulics-and-hydrology-forum/183640/modelling-active-control-for-prv/536950#536950"&gt;Modelling active control for PRV&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;I have updated &lt;a href="/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/43192/modeling-prv-psv-controlled-by-pressure-at-remote-location-in-the-model/"&gt;the article&lt;/a&gt; with some more details based on what I believe Dr. Walski was suggesting, plus the other idea I had posted in the above thread. Please also see these papers which Dr. Walski worked on:&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;Economic Analysis of Pressure Control for Leakage and Pipe Burst Reduction - Creaco,&amp;nbsp;Walski, ASCE J. Water Resour. Plann. Manage., 2017,&lt;/li&gt;
&lt;li&gt;Operation and Cost-Effectiveness of Local and Remote RTC -&amp;nbsp;&lt;span&gt;Creaco,&amp;nbsp;&lt;/span&gt;&lt;span&gt;Walski,&amp;nbsp;ASCE&amp;nbsp;J. Water Resour. Plann. Manage., 2018&lt;/span&gt;&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;&lt;span&gt;The conclusion in these papers&amp;nbsp;is that a conventional PRV is good enough in most cases, while remote control costs more and is subject to instability.&lt;/span&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: PRV with a control node</title><link>https://communities.bentley.com/thread/775512?ContentTypeID=1</link><pubDate>Fri, 28 Jul 2023 22:01:04 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:084a86a4-cae2-48b0-81f6-b6ea533ceda9</guid><dc:creator>Eduardo Fernandes</dc:creator><description>&lt;p&gt;Hi, Larry. Thank you for the reply.&lt;br /&gt;&lt;br /&gt;&lt;span&gt;This article is exactly what I&amp;#39;m talking about. However, it explains the problem but does not explain a solution.&lt;/span&gt;&lt;br /&gt;&lt;br /&gt;&lt;span&gt;The only part that leads to a solution is this part: &amp;quot;&lt;em&gt;you can develop a relationship between demand in the zone and TCV setting&lt;/em&gt;&amp;quot;. I understand that there is no solution for what happens on the operation. It talks about a PLC but&amp;nbsp;doesn&amp;#39;t show how I represent this in the model.&lt;br /&gt;&lt;br /&gt;&lt;/span&gt;Can I only do this with a &amp;quot;trick&amp;quot; using TCV?&lt;br /&gt;&lt;br /&gt;In my model I have 72 PRV that operates like this in field. I don&amp;#39;t think that send it to you will finds a way. I can built a&amp;nbsp;hypothetical model as a test, when diferents demand in results in the same pressure in a specific node.&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: PRV with a control node</title><link>https://communities.bentley.com/thread/775511?ContentTypeID=1</link><pubDate>Fri, 28 Jul 2023 21:46:05 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:57798d4a-47e8-4297-9785-2bf473ab8229</guid><dc:creator>Larry Abla</dc:creator><description>&lt;p&gt;Hi Eduardo,&lt;/p&gt;
&lt;p&gt;I found this Wiki article which I believe speaks to the issue you are having - &lt;a href="/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/43192/modeling-prv-psv-controlled-by-pressure-at-remote-location-in-the-model"&gt;Modeling PRV / PSV controlled by pressure at remote location in the model&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;Please see if it answers your question but if not, we might need to get a copy of your model for analyis.&lt;/p&gt;
&lt;p&gt;Thank-you,&lt;br /&gt;Larry Abla&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item></channel></rss>