I have a bunch of pumps but the water is in low pressure. Is it a bug?
Factorio – How to Deal with Water Low Pressure Issues
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Best Answer
Factorio's fluid simulation is rather quirky and you should not take the numbers on pipes too seriously. (It currently simulates equalizing amount of fluid in adjacent containers, like water sloshing in an open tank, not realistic pressure/velocity. The number you are looking at is the amount of fluid.) Look at how much production you're getting from the machines on the other end, not the exact number. That said, there's some definite room for improvement in your picture:
You have too many offshore pumps per pipe, so you aren't getting the most output from your pumps because it's limited by the pipe maximum flow rate. If I remember correctly, the ratio is about one offshore pump per pipe, but you can get a little bit more by using two per pipe (wasting most of the capacity of the second pump, but maximizing the flow in the pipe).
Run multiple pipelines in parallel from pumps to consumers.
For long runs, use underground pipes whenever possible. The reduction in flow depends on the number of pipe segments, and underground pipes count as 2 segments no matter how much distance they span.
Here's an example of some pumps I built:
This information is current as of Factorio 0.16.51. A new fluid system is planned for version 0.17, though that is of course still in development.