5 replies to this topic

[Tween]

One water pump with suction/discharge 1" & Head 1m pump connected to 3" header which goest to tank.The tank dimension is dia x height = 14.2 m x 6 m .Vol=820 m^ 3.Help me to calculate time to fill the whole tank.

Please see the attached file for Block diagram.

 

Thank you.

 

Attached Files

•  Pump flow.xlsx   11.03KB   83 downloads

[fseipel]

First, obtain the pump curve for the 1" pump.

 

Then calculate the pressure drop in the piping; if it is short, the vertical head (6 m) will predominate; and for an initial estimate, you can read pump flow rate off curve at this discharge head less the 1 m at suction.

 

Then divide tank volume by fill rate, making sure volume units cancel, to calculate fill time. 

 

Refine results by calculating pressure drop in pipe at this flow rate -- if fluid is not water or is viscous this formal calculation is important -- then re-read curve at the new head that includes these friction losses.  If you want just an estimate of friction loses for water, simply consult a pressure drop vs flow table to estimate pressure drop component due to friction (most suitable for water) vs that due to the elevation change.

 

Filling through bottom is faster since you will be further right at all times on pump curve.  If you do that, you may want to include one or more check valves to prevent backflow.  Typically flow in a 1" pipe has excessive pressure drop at a flow of over 25-30 GPM; since tank is ~216,000 gal it would take a very long time to fill with a 1" pump -- probably 5 days or more at minimum, but obviously pump curve and friction loses determine this.

[Tween]

Thank you Fseipel..

 

I expect more sugestions in different point of view.

[varunpassi]

Rough method.

 

filling time = volume of tank / pump capacity.

 

but as specified earlier by fseipel, 1" pipe will take lot of time as flow rate thr' pipe is very less.

Sample calculation correct em if wrong.

 

 

Vol 820 m3   Pipe size 1 in     33.4 mm   thickness 4.55 mm   inner dia 24.3 mm   area of pipe 0.000464 m2   velocity assumed considering water 3 m/sec    Flow rate 0.001391 m3/sec     5.008713 m3/hr   Selected pump capacity 6 m3/hr   Time taken to fill Volume fo tank / Pump capacity   136.6667 hr  

[Shannoncomp]

You can calculate the time loading speed of tank. you can use the water indicator pipe to check and show the exact location of water in tank.If the water supply is high speed then you will check the filling speed in MM indicators.Normal reading is set to be the flow of water in tank.

[tushar.patil84]

Dear for this you have to known the pump capacity & Pump performance curve then by pipe pressure drop calculation you will calculated

approx timing of tank filling as said by fesipl