Flowrate through reduced pipe diameter
Flowrate through reduced pipe diameter
(OP)
Hi all.
I have a slurry pipeline 150dia Steel Pipeline 40 km long which will need to tie in to a 90dia Steel pipeline 12 metres long at the discharge end to make use of existing valves and instrumentation. Im now trying to calculate whether there will be any changes to the flowrate.
Pump Q = 16 Lps
Slurry SG = 1.94
Am I expecting any change of flowrate? How do I calculate this? Tried treating this as an orifice flow but doesnt give a convincing result. Is the reduction in pipe diameter significant enough to impact the pump performance?
Thanks everyone!
I have a slurry pipeline 150dia Steel Pipeline 40 km long which will need to tie in to a 90dia Steel pipeline 12 metres long at the discharge end to make use of existing valves and instrumentation. Im now trying to calculate whether there will be any changes to the flowrate.
Pump Q = 16 Lps
Slurry SG = 1.94
Am I expecting any change of flowrate? How do I calculate this? Tried treating this as an orifice flow but doesnt give a convincing result. Is the reduction in pipe diameter significant enough to impact the pump performance?
Thanks everyone!





RE: Flowrate through reduced pipe diameter
Calculate your pressure drop over the 12 meter long section using that velocity and hope your pump can provide the same flowrate at the new total differential pressure of both the 46 Km + 12 m lengths. Check your pump curve at the same flowrate and new differential pressure to be sure.
Only put off until tomorrow what you are willing to die having left undone. - Pablo Picasso
RE: Flowrate through reduced pipe diameter
To clarify, V2 will be calculated on the assumption that Q1 = Q2. I would have thought at some point the flowrate will change. How do we determine this?
Thanks.
Nimajoef
RE: Flowrate through reduced pipe diameter
The study of how long it will take Q2 to equal Q1 is transient flow.. or a temporary unsteady state flow.
Only put off until tomorrow what you are willing to die having left undone. - Pablo Picasso
RE: Flowrate through reduced pipe diameter
Thanks a lot for your input.
Nimajoef
RE: Flowrate through reduced pipe diameter
Only put off until tomorrow what you are willing to die having left undone. - Pablo Picasso