I have placed a FCV before pumpins station for flow control. I created a valve setting pattern same as the node on the downstream side to analyse it in EPS. but it is showing following errors:
1. FCV cannot deliver flow.
2. Maximum trials exceeded.System may be unstable.
3. Negative pressure at FCV.
4. Negative pressure at downstream junction.
5. Negative pressure at downstream pump
How can i fix these issues?
You can fix this by not using a flow control valve. While they my sound nice to a modeler, they are almost never installed in real systems and they are very expensive. There is almost always a better solution. What exactly are you trying to accomplish with the FCV?
Placing an FCV in front of a pump will cause NPSH problems which is what this model is telling you.
This Wiki article was created by Dr. Walski to support his comments in this post.