I need to know whether an automatic pressure pump (Water pump + motor on/off control unit) will work?

The details are as follows:


1. Dimension of the loft tank: length X width X height = 1095mm X 720mm X 435mm


2. Loft tank capacity: 270 liters


3. Height of the tank above the tap (if that matters): 4.5 feet (1372mm)





Since water from this tank does not have enough pressure required (Specifications describe the adequate pressure as that created by a vertical tank containing 700/800 liters of water) to operate a washing machine, I plan to install a water pump and a automatic control unit that turns on and off the water pump when the tap is turned on to provide the required pressure.


However, the automatic control unit requires that water have a minimum pressure of 1.5 bars to operate the control unit itself. I would like to know if the control unit itself will operate with the tank dimension that I have when this control unit and the water pump is fitted immediately below the tank?


My second question is whether a 1 horse power motor will provide the adequate pressure required by the washing machine?


Can someone provide the formula to calculate the water pressure (in bars) for the given dimension of the tank?I need to know whether an automatic pressure pump (Water pump + motor on/off control unit) will work?
formula for pressure is


density x height x gravitational constant (9.81)


u have to put parameters in untis accordingly to get answer in bars


1 bar= 1kg/cm2


density of water is 1000kg/m3.


pls do the calculation accordingly.


THEORATICALLY PRESSURE DEPENDS UPON HEAD OF WATER AND NOT THE QUANTITY OF WATER( that means u can increase the pressure by increasing height. capacity of loft tank would matter for capacity of p/p


1 hp motor seems quiet big.


hw much is ur pump capacity get motor accordingly.


choose the p/p according to size of washing m/c and loft tank.


I don't understand why ur washing machine requires additional pressure, I mean in washing m/c ( i guess house hold) u just need to accumulate water so that clothes can be soaked. if this is case pressure by gravity would do good for u only thing it may take more time to fill the water.


In this problem u have to consider many design aspects. communicate with engineers for same.I need to know whether an automatic pressure pump (Water pump + motor on/off control unit) will work?
Good.


Interesting question.





What i feel is the control unit itself will provide you the required pressure as its being set in the air-set of the final control element.
make easy your process
I wouldn't be tinkering with pumps, pressure switches and pressure vessels. You can buy mains pressure water pump units in different capacities ready to hook up and good to go no hassles and a warranty it will work to boot.





Another question that passes my mind is what evidence do you have that the pressure from an overhead tank is insufficient to run a washing machine, granted it will take a bit longer to fill at a lower pressure but it should work reliably without pumps and stuff. Give it a try before you start spending money.