Answer / carl_ellis

I want to know if flowrate increases in 16' pipe line what
will happen to upstream pressure and why?

There can be flow only if there is a differential pressure
to create the flow.

To increase flow rate, the differential pressure has to
increase.

To increase the differential pressure:
- the downstream pressure can decrease
- the upstream pressure can increase
- both upstream and downstream pressures can move in the
same direction, but vary in the magnitude of the change so
that the DP increases.

This principle applies to any flow, the size of the pipe
doesn't matter.

Carl Ellis
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