What is the formula to calculate pump capacity and liters per minute (lph) calculation for high rise bulidings?
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1) Every pump manufacturer provides a Head-Capacity curve or a Table to tell you how much water you can expect from what depth for a given HP and efficiency range. Obviously deeper you install a pump, less water it pumps. Please note that higher the HP you use does not mean that more water you get. Ideally, a pump should extract only that much water as much as the yield rate of the aquifer permits so as to maintain a steady state in the pumping water level..
2) Calculating the HP HP/Pump Efficiency
[Total Head (for Submersible Pump) = Total Delivery Head = Pumping Water Level below Ground level + Delivery Head above ground level]
of submersible pump as 'BHP of Pump' as follows:
Water Horse Power (WHP) = Discharge (lt/sec.)X Total Head (m) / 76
Break Horse Power (BHP) = Water
[Note: Suction Head = 0, for submersible pump Pumping Water Level below groundwater level = water level below ground level (before pumping) + Steady State Drawdown (during pumping)]
3) Correct size of submersible pumpset
To decide about the correct size of submersible pumpset, the details regarding Discharge(LPS) Total Head i.e Pumped water level(Static water head + Drawdown) in metres to discharge point on groundlevel required. Discharge data of winter season and pumped water level date of summer season is necessary as these are the maximum values based on which we can calculate H.P of pumpset.
Other option is, take the data of discharge and total head of your borewell to pump dealer. By using pump curves, the dealer can suggest you the correct size of pumpset. You have to select the pumpset which consumes less power.
To calculate the HP of pumpset, the following formula can be used.
Q in LPS X Total Head in metres
H.P = ----------------------------------------
76 X Pump efficiency
The no. of stages can be calculated by dividing the total head by 4 metres (after deducting several losses, it is assumed single stage pumpset can lift the water upto 4 metre which generally some manufacturers adopt)
2) Calculating the HP HP/Pump Efficiency
[Total Head (for Submersible Pump) = Total Delivery Head = Pumping Water Level below Ground level + Delivery Head above ground level]
of submersible pump as 'BHP of Pump' as follows:
Water Horse Power (WHP) = Discharge (lt/sec.)X Total Head (m) / 76
Break Horse Power (BHP) = Water
[Note: Suction Head = 0, for submersible pump Pumping Water Level below groundwater level = water level below ground level (before pumping) + Steady State Drawdown (during pumping)]
3) Correct size of submersible pumpset
To decide about the correct size of submersible pumpset, the details regarding Discharge(LPS) Total Head i.e Pumped water level(Static water head + Drawdown) in metres to discharge point on groundlevel required. Discharge data of winter season and pumped water level date of summer season is necessary as these are the maximum values based on which we can calculate H.P of pumpset.
Other option is, take the data of discharge and total head of your borewell to pump dealer. By using pump curves, the dealer can suggest you the correct size of pumpset. You have to select the pumpset which consumes less power.
To calculate the HP of pumpset, the following formula can be used.
Q in LPS X Total Head in metres
H.P = ----------------------------------------
76 X Pump efficiency
The no. of stages can be calculated by dividing the total head by 4 metres (after deducting several losses, it is assumed single stage pumpset can lift the water upto 4 metre which generally some manufacturers adopt)
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