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Darcy Weisbach roughness

I entered the the Darcy Welsbach roughness heights for my pipes but after doing some research I found out that the roughness can be negligible in certain depending on the Reynolds number. So I ran my scenarios with all the roughness's set to zero to see how that would impact my results and I noticed it had no impact compared to when I used the roughness associated with the pipe materials. This would indicate to me that the roughness heights are negligible in my my situation. Is that a correct assumption?