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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>PMP-1 exceeds the maximum operating point specified for the pump curve</title><link>https://communities.bentley.com/products/hydraulics___hydrology/f/haestad-hydraulics-and-hydrology-forum/240435/pmp-1-exceeds-the-maximum-operating-point-specified-for-the-pump-curve</link><description>getting following errors please guide how to solve 
 1. PMP-1 exceeds the maximum operating point specified for the pump curve 
 2. Also while running pump Failure case getting Cavitation 
 
 Regards,</description><dc:language>en-US</dc:language><generator>Telligent Community 12</generator><item><title>RE: PMP-1 exceeds the maximum operating point specified for the pump curve</title><link>https://communities.bentley.com/thread/749293?ContentTypeID=1</link><pubDate>Fri, 13 Jan 2023 13:48:39 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:d3a01f49-c497-4341-bb30-2c7869bbacdf</guid><dc:creator>Jesse Dringoli</dc:creator><description>[quote userid="1375304" url="~/products/hydraulics___hydrology/f/haestad-hydraulics-and-hydrology-forum/240435/pmp-1-exceeds-the-maximum-operating-point-specified-for-the-pump-curve"]2. Also while running pump Failure case getting&amp;nbsp;Cavitation[/quote]
&lt;p&gt;Assuming you are referring to a transient simulation in HAMMER, cavitation is an expected phenomenon when the pressure drops below the vapor pressure limit (this is set in the calculation options and defaults to -10 m)&lt;/p&gt;
&lt;p&gt;You can read more about how HAMMER models vapor pocket formation and collapse here:&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;&lt;a href="/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/21174/assumptions-and-limitations-of-tracking-air-or-vapor-pockets-in-hammer"&gt;Assumptions and limitations of tracking air or vapor pockets in HAMMER&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;a href="/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/22669/how-does-hammer-calculate-vapor-pocket-formation-and-collapse"&gt;How does HAMMER calculate vapor pocket formation and collapse?&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;Preventing this from happening is where the engineer&amp;#39;s job comes in. There are many possible mitigation strategies for preventing cavitation/vapor pockets but the &amp;quot;correct&amp;quot; one depends on your design and space requirements, budget and engineering judgement. For example for a pump shutdown, a hydropneumatic tank on the discharge side of the pump can often (but not always) help, but there are many other things to consider: &lt;a href="/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/2740/transient-protection-strategies"&gt;Transient Protection Strategies&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;You may also need to consider how long the pump will be off, in case the topography is such that a tank would drain as long as the pump remains off. See: &lt;a href="/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/8420/negative-pressures-occur-during-a-transient-simulation-no-matter-what-protection-is-used"&gt;Negative pressures occur during a transient simulation no matter what protection is used&lt;/a&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: PMP-1 exceeds the maximum operating point specified for the pump curve</title><link>https://communities.bentley.com/thread/749161?ContentTypeID=1</link><pubDate>Thu, 12 Jan 2023 17:08:49 GMT</pubDate><guid isPermaLink="false">6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:9b280c01-451c-4330-b846-c85d4691083c</guid><dc:creator>Larry Abla</dc:creator><description>&lt;p&gt;D Pradhan,&lt;/p&gt;
&lt;p&gt;This Wiki article should explain and help resolve the error you are seeing regarding your pump &lt;a href="/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/24830/user-notification-pump-exceeds-the-maximum-operating-point-specified-for-the-pump-curve"&gt;exceeding the maximum operating point specified for the pump curve&lt;/a&gt;.&lt;/p&gt;
&lt;p&gt;Which product and version are you running when you see the Cavitation?&amp;nbsp; Are you receiving a User Notification?&amp;nbsp; If so, what else does it tell you?&lt;/p&gt;
&lt;p&gt;Please let me know.&lt;/p&gt;
&lt;p&gt;Thanks,&lt;br /&gt;Larry&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item></channel></rss>