3. Partly reduce power and still pump more Bring pump power back down to the maximum power savings (1 above) then increase it but only while the flow remains laminar and no further. With this option you get a combination of lower power use and increased flow. Keep in mind this “optimal” pressure will always be less than they use now so we aren’t hitting any pressure limits, rather we are reducing pressure in the pipeline.
... finally explains why the company stated previously they could achieve "optimal" results with a different "power supply" than the one used in the TC test, which would have been a constant at that pump station at that point.
Exactly as earth1 has now pointed out to us:
I suspect that the third one would be pretty attractive to most. “Save money, reduce pipeline operating emissions and get more throughput – avoiding the [need] to build more pipelines – saving the company capital.”. This is effectively the exact sweet spot you referred to in your post.
The pieces of this puzzle are finally coming together.