When we typically size a mainline, they start larger (6" @ the point of connect) and decrease in size as they reach the end of system. We have a looped mainline that is primarily a 4" mainline however there are some areas that go from a 4" to a 6" then back to a 4" along the looped mainline. If the mainline is looped shouldn't it be one consistent size and not transition from a small pipe to a larger pipe then back to a small pipe. This is something we would like to avoid so we are manually changing the looped main to a 6", is there a way to avoid this moving forward so we do not have to manually change the pipe size?

I have attached an image of the issue I am having. you will see at the POC a 6" mainline then it changes to a 4" then back to a 6" after the crossing. Is there a way to have the 4" size to a 6" without manually changing it?