Hi Ray, In OpenPlant Modeler, length of flow arrow is calculated as 1.5 x Nominal Diameter of pipe. So, for 200mm pipe, flow arrow length would be 300mm and similarly flow arrow length for 100mm pipe should be 150mm. In order to accommodate flow arrow in piece of pipe so that it can be oriented in both directions, the minimum length required is 2 x Flow Arrow Length or 3 x Nominal Diameter of Pipe. Hope this helps! Regards, Harpreet
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