https://communities.bentley.com/products/building/performance/f/hevacomp-forum/109953/netsys-cws-flow-and-pressure-lossHello Group I am a returning user of Hevacomp. I haven&#39;t used it for several years and lost some knowledge and looking for some assistance. I have modeled a CWS system in Netsys, inserted a system marker which doesn&#39;t return any issues. The problemen-USTelligent Community 12https://communities.bentley.com/thread/334963?ContentTypeID=1Wed, 19 Aug 2015 08:42:36 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:45de37f8-97ca-4efb-b242-d5a7db4d6b6eDuncan BrownHi Neil - The NETSYS CWS program doesn&#39;t allow for the inclusion of a pump. The pipe section sizing is calculated from the initial pressure at the system marker, whether that be entered directly or calculated from the height of tank entry - you can consider this initial pressure as being the output from the pump if that helps clarify this.<br /> <br /> The maximum flow rate can be taken from the first section in the results page. For pressure drops, you would need to consider individual outlets.<br /> <br /> Please note that myself and my colleagues monitor the forum closely - there is no requirement to log a service request, a chat session and a forum post to get our attention! :)<div style="clear:both;"></div>