What a fantastic job you have done here. Could you please explain a bit about control scenario, and how you mange to control vfd in those pumps to keep them on optimum point of the curve.
Hi, many thanks for your support. I made another video to illustrate the control of pumps working in series in short pipelines, it is not published yet. I will make another one for pumps working on parallel. Thanks for the suggestion
Thanks for your comment, if you mean the VFD output frequency then i think the answer is yes and no. in brief: Output frequency defines motor speed, which define the pump curve, now the operating process point on the curve is defined by the process resistance. As long as your process resistance curve does not change you can predict the flow rate (with relative accuracy). The system resistance is the total losses in each system component (pipe, elbow, valve....) or gain (level change). Assume your pump is running at any speed, and now close the suction or discharge valve which will change the system resistance (forget about pump damage due to excessive heat or cavitation) the flow rate will change. For fixed speed pump, it is common to use the motor current as indication of the flow rate. if you need to discuss in details you can email me at "lunchnlearnchannel@gmail.com"
I am not entirely sure why you used a macro here instead of just a table with some if-then statements to create the values. I think I managed to do that. Maybe I missed something? Thanks
Hi Steve, Thanks to take the time to comment. it is matter of preference. the main idea of the video is discussing operating more than one pump in parallel. Macro is one way to use to calculate the net result. I found macros easier to debug, can accommodate more complex tasks, and a step for more easy to user interface (if Forms is used). Also to find the operating point (intersection between the two curves) it may be easier to use Macro.
I do not have access to my computer now however I am working on developing another one which does not use macro as Steve commented. If you are interested, I can send you this file which shall do the same
@@ianclark2097 Hi, sorry I am trying to fix this link. If you send your email or send me an email the the email included in the description, I will send the file to you. Cheers
@@LunchandLearnX I will send you an email directly and it should be in your inbox shortly. Much appreciate the swift response and your excellent content. Very helpful!
@@ianclark2097 I sent the file but I received the following: The response from the remote server was: 550 permanent failure for one or more recipients (ian.clark@ajay-sqm.com:blocked). Please unblock or use valid email
