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[Johnny English]

Hi mates,
I would like to increase power of watering pump of my garden without buying a new one, so I'm thinking of decreasing diameter of sucker pipe from 3/4" to 1/2". If my theory correct the power of suck will grow. It is on the family farm where you can find just a hundred yrs old hand digged well, in which the water level sometimes low a bit ...Though I'm not sure of how sucker and pressure side diameters relate to each other and what I should do at the pusher/pressure side of pump... any advice welcomed! Thx Laszlo

[pscocoa]

I would have thought reducing sucker pipe diameter would have made things worse as you are still working with same inlet size on the pump itself. The lift classification of the pump is relevant particularly if water level now lower.

[Mr Skrunts]

As allready said, reducing the inlet pipe size I doubt would improve the pumps performace, where as reducing the delivery pipe diameter would would effectivly increase the distance it sprayed if say it were used as a hose pipe.

[Kevin Wood]

Indeed. To get maximum flow from the pump (which is, I assume, the aim), you need to minimise the pressure difference across it, so as little restriction at input and output as possible.

[Varche]

Have you checked for any obstructions and cleaned the filter?

[Johnny English]

Yes, filter is checked, right  tried some variation of diameters the most effective solution was all the time when input and output size were the same as you said above. In case of low water level there is no such hydrostatic pressure as the pump would need for proper work so I'm considering of buying a new and double strong pump... as an experiment it was qiute good one though... thx for responses guys! 

[flyer 0712]

Yep..the same applies to air as water ..to reduce size will have a detrimental effect 

[cem_devecioglu]

if you decrease the diameter the fluid velocity will increase which will also increase the fluid flow resistance
 
http://www.pumpfundamentals.com/tutorial3.htm
 
http://www.ajdesigner.com/phppump/pump_equations_water_horse_power.php

[Johnny English]

if you decrease the diameter the fluid velocity will increase which will also increase the fluid flow resistance
 
http://www.pumpfundamentals.com/tutorial3.htm
 
http://www.ajdesigner.com/phppump/pump_equations_water_horse_power.php

Be welcomed Cem!  Best sites ever in connection with pump systems and fluids    thx mate !

[cem_devecioglu]

if you decrease the diameter the fluid velocity will increase which will also increase the fluid flow resistance
 
http://www.pumpfundamentals.com/tutorial3.htm
 
http://www.ajdesigner.com/phppump/pump_equations_water_horse_power.php

Be welcomed Cem!  Best sites ever in connection with pump systems and fluids    thx mate !

 

[Johnny English]

Just a quick report guys, it was not too easy to reveal reasons of misworking of the pump. Finally I had to buy a new one as the previous pump played up. It's occurred by three reasons in the same time :1. wounded cable that caused low voltage of electricity 190-200V instead of the standard 230V that caused the pump to be burned off, 2. semi-closed and rusted manual valve,which decreased the inside diameter of waterpipe that caused continous overloading for pump 3. tired and worn spring in pressure switch that caused misworking of the unit and indirectly also continous overloading. At the end I swapped not only a pump but cabling and press switch as well... ...and now everythink work properly.