Right now I am modeling a backflow preventer using a check valve and a general purpose valve. Is this the best way to model a backflow preventer? I read in the help menu that this is a way to model it.
I also noticed that I don't have any headloss curves in my engineering library. I know that I can create libraries, so where is the best place to get information to add to these libraries? Thanks.
Matt N.
What you are doing sounds right.
Information on the actual backflow preventer curves can be obtained from teh manufacturers. They often have it on their web pages.
I assume you are modeling the system of a user that buys water from a larger wholesale system. What is your application?
It is actually a small independent system using a hydropneumatic tank. One of the buildings has only a humidifier and an aboveground backflow preventer is required.
One of the design requirements is that we use 6" HDPE for the main loop of the system. Our problem is we are having trouble meeting the minimum velocity requirements since the flow to the buildings isn't all that big. Do you have any suggestions on to increase the velocity in the main? We have thought about using booster pumps, but we want to avoid using these. Thanks.
Where did you get the "minimum velocity requirements "? I've never heard of minimum velcoity requirements for clean water. Usually they only pertain to solids ladden flows like sewers, sludge lines, raw water pipes...
Where did you get the "design requirement" of 6 in. pipe? Does the humidifier need that much flow or is that some requirement meant for fire lines?
What is the range of velocites you will have in the 6 in. pipe.
Question assumptions.