Optimizing Fluid Flow into Tanks: Pressure, Diameter, and Length Considerations

[Moolan]

Hi,

I got a puzzling question. In a scenario where I have a pipe connected to an empty atmospheric tank and the flow is from the pipe into the tank.

Pressure at the pipe inlet is 500kPag and the pipe diameter and length is 6" and 5m respectively.

There are no fittings in between. I can safety assume that the pressure loss from pipe is negligible (including entrance loss).

So, can I say the pressure of the liquid just after it left the pipe is 500kPag or atm? If atm, does this energy gets converted to velocity?

Thanks.

Edit: Forgot to add the flow is at 180m3/hr, so not excessive to cause massive pressure loss.

 

[ank_gl]

pressure loss in a pipe is not only due to fittings, the loss is inherently embedded into the flow itself. whenever there is a flow, some loss would be here.

Pressure at outlet will be equal to inlet pressure only when there is no flow.

 

[ank_gl]

oops! apologies, i didnt read OP carefully :D

If the pipe is exhausting into atmosphere(ie pipe outlet is at atmospheric pressure), pressure will be 1 atm.

If the pipe is exhausting into the tank filled with the liquid, pressure at pipe outlet is above atmospheric.

And yes, the pressure energy gets converted to flow energy & a bit of it is used to overcome friction.