Problem with pressure in pipeline
Problem with pressure in pipeline
(OP)
Hi Folks;
As we all knew, and I used to experimentally observe it, as the temperature of water increases, pressure drop through pipeline (kPa/m) decreases. Now, I am getting the opposite, while the results are so consistent and reproducible !!! As the water temperature increases, pressure drop increases too !!! I have calibrated the pressure transducers, and those look fine. Any guess ? Has anybody seen such a situation ?
Also, as we all knew again, with decreasing velocity, friction factor increases (remember Moody diagram). Now for my case, I am getting decreasing trend for temperature range of 20 to 30, while the trend is increasing for above 30 !!!
I am running water in a 2" closed-loop pipeline of 46 m length, with a magnetic flow meter and digital pressure transducers.
Thanks;
As we all knew, and I used to experimentally observe it, as the temperature of water increases, pressure drop through pipeline (kPa/m) decreases. Now, I am getting the opposite, while the results are so consistent and reproducible !!! As the water temperature increases, pressure drop increases too !!! I have calibrated the pressure transducers, and those look fine. Any guess ? Has anybody seen such a situation ?
Also, as we all knew again, with decreasing velocity, friction factor increases (remember Moody diagram). Now for my case, I am getting decreasing trend for temperature range of 20 to 30, while the trend is increasing for above 30 !!!
I am running water in a 2" closed-loop pipeline of 46 m length, with a magnetic flow meter and digital pressure transducers.
Thanks;





RE: Problem with pressure in pipeline
If I take two cases at constant mass flow rate (or constant standard barrels per time) and I raise the temperature, the density will decrease slightly and the viscosity will increase, both those changes would directionally raise the pressure drop.
RE: Problem with pressure in pipeline
Your system sound like a test/lab bench?
Best regards
Morten
RE: Problem with pressure in pipeline
@ Morten: Yes, this is a 46m length closed-loop pipeline.
RE: Problem with pressure in pipeline