What is an appropriate pressure for the pump outlet?
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Transporting tar from the dock to the tar tank, pump flow rate 300 m3/h； Pipe diameter DN200, length 3600 meters, elevation difference of 30 meters (the dock is at a lower level), 8 elbows, 2 valves ； Tar parameters: viscosity value (at room temperature) 30 m²/s, specific gravity 1
This post was last edited by 3983596_FPPZ on 2018-10-16 at 11:22. It’s not easy to calculate accurately; the head required is equal to the head needed to account for frictional losses plus the head needed to cover local losses, minus the height difference, plus a certain safety margin. Due to high viscosity, the head required to address frictional losses is the highest. For specific calculation methods, refer to materials on fluid mechanics; software can also be downloaded from the internet for such calculations, and it’s not very complicated. But pay attention to the highest point of the pipeline or the peak of the slope. The flow rate is 2.65 meters per second, which is relatively high; it is recommended to check the optimal flow rate for chemical raw materials to confirm this value
Does the expert have any software? Or could you help calculate it? Thank you so much~! ~! ~!
Are there any uphill sections in such a long distance?
If there are high points or uphill sections in between, especially near the dock, then the head loss of 30 meters should not be deducted
It’s a continuous slope, fairly gentle, with no sudden climbs!
I calculated that a discharge pressure of 2.5 MPa should be sufficient
How did you calculate it? Seeking advice!
This post was last edited by bfdlwolf on 2018-10-16 at 14:51. If a pump flow rate of 300 m3/h is considered normal, the total pressure drop in the pipeline is 2.06 MPa, with a pressure drop of 48.9 KPa per 100 meters, and the flow velocity is 2.653 m/s. Typically, the rated flow rate of a pump is set at 1.2 times the normal flow rate; in this case, the total pressure drop in the pipeline becomes 2.74 MPa, so the outlet pressure of the pump should be 2.74 MPa. According to standards, the design pressure for the pipeline should also be 2.74 MPa. Incidentally, choosing a pipe diameter that is too small is not economical from a design perspective.
This post was last edited by bfdlwolf on 2018-10-16 at 15:27. Tar is transported from the dock to the tar tank; since the dock is at a lower level, the height difference should not be reduced. Pump outlet pressure = Total pipeline resistance loss + Head difference
The dock is 30 meters low, not 30 meters high