The drawback is that if electricity is cut off, u may not be able to get water.

hi all

need advise on the water piping connection for my house. the black line is originally from main source to the house. i then added water filter and water pump to use the water from water tank. blue colour is the newly added and installed by the plumber.

problems i face:-

1. after using the water pump which pump out the water from the tank into the house i somehow feel the water pressure is not as good as the original direct source. water pump capacity not good enough? now running water pump, so valve 01 is close all the while.

2. plumber told me when i want to backflush the water filter, i need to off pump, closed valve 02 & valve 04 and open valve 01. this is to use direct water source. he says if i didnt do this the pressure from water pump might damage the water filter

3. when there is power outage, i need to do the same for above to run direct water source. because no power, the pump not running there will be no water in the house unless switch to direct water source.

i somehow feels that this is not very convenient as u need to turn this on and off here and there. is this common for all water pump users?

there is one time at night raining heavily and suddenly power outage. i have to use umbrella go outside of house to turn all the valve to switch to direct line in order to use water inside the house

anyone can advise or any modifications to be done?

1. Checkvalve just before valve 01.
2. Checkvalve rarely spoil so can leave valve 01 open if check valve present.
3. Filter bypass and tank bypass and pump bypass. Good for maintainence and flexibility. Of course need a valve at the bypass. Tank bypass need to have a checkvalve.
4. Check the pressure reading at the pump. Check the pump model and spec and see if the pressure is at what it should be. Sometimes the automatic pump controller need to adjust the pressure setting if it is not properly set.
5. Check valve just after the output of the tank.

This with above modification, all the valves can remain open all the time with all the bypass closed all the time except for the tank bypass.
If power outage, you will have pressure of the main.
And can just backwash without on or off any valve.

wow. thanks for the helpful advise.

1. & 2. - if install checkvalve do i still need to have the valve 01? or can remove/replace with the checkvalve?

3. sorry what does it means do u mean by "bypass" for the filter, tank and pump. is it another piping system?

4. ok will check on the pump model and spec

Best to leave the valve in place. Valves are still useful for maintainence. Also check valves may fail in future thus having valves as backup is good.

Bypass means a pipe connection that bypasses something. Like a pipe connection that passes between input and output of filter without going through the filter. In case filter leaking or need to remove for maintainence, the bypass is useful. Close connection to filter, open connection of bypass and the whole filter can be easily removed for repair or maintainence.
Water tank bypass is for maintainence of water tank if needed and if pump fail, you will have pressure of mains.
Pump bypass is for easy maintainence of pump in future.

oh. now i know what is bypass

if i were to make a bypass line for the filter, tank and pump, the valve will be for both the line and bypass line? or the valve on the equipment itself is sufficient.

Bypass must have valve. So both.

And also check if pump still pumping even when all the faucet or water outlets are closed.

If pump still pumping means there is a leak or pump pumping water into tank through one of the pipes which is not supposed to happen. If pump on and off cycling means there is a slow leak.

something went up my mind.

my previous connection is either 2 way:
1. main water to house (without pump)
2. using water from tank (with pump function)

from ur proposal above, both line are running. so meaning every water usage is pressure from the pump? correct me if im wrong?

To me your current setup is already every place after tank is pump pressure.
My setup is just to allow both lines to be open at the same time with checkvalve to prevent water from pump to go to the parts before tank.

have a look at the drawing.

normal daily operation is all valve open, water pump on. (except bypass line)

if no power, pump will not works, there will still water from main source into the house.
if washing filter, backflush, there will be no pressure from water pump to water filter because have check valve.

red colour line is the bypass line for water filter. if water filter damage/repair V-F1 & 2 close. V-BP1 & 2 open. normal operation V-BP1 & 2 will be close.

if water tank need repair/maintenance, V-02 & V-03 close. still will have water from main source. valve 04 need close? need install check valve here? water will go to pump?

if water pump need repair/maintenance, V-04 & V-03 close. water from main source will still go to tank. and also go to house.

is this correct? hmm.gif

Seems about right. But the filter bypass only need 1 valve for the bypass. No point having 2.
For tank maintainence no need close v4.

okok. thanks. if thats the case V-BP2 will be remove

another thing that still makes me wondering is on the daily operation water usage. the water will be both from water tank and also main source right? then what pressure am i getting? the pressure from the water pump or the pressure from the main source? and everytime water used in the house pump will operate right?

can i just off the pump then only using water from main? when there is no water from main, only i turn on the pump to use water from the tank and pressure from the pump?

That’s entirely up to you.
If you find the pressure from the main satisfactory, you may off the pump. Water pressure will be from main mostly and only if you open a lot of faucet then maybe some water from the tank will flow pass checkvalve(the one just after tank)
and pump due to pressure drop(from the water usage) until the water pressure less than pressure of water from tank. Ie, mostly from main pressure. When there is water interruption from main, water will naturally flow from water tank passing the checkvalve and pump to provide water to house.

If main not supplying adequate pressure, just keep the pump on.

If no water coming from main(water interruption).....that will depend on the water pump, make sure it has dry run protection, if it doesn’t , at least make sure there is a freaking big tank that can have enough water all the time, aka never dry run the pump.

There is a tangki in the roof?

Seems like the checkvalve before V03 should be after pump not before. It can be before or after V04 even before the T junction to the house. By right just use either main or big water tank. When there rationing, open V04 and close V01. Allowing simultaneous flow from mains and pump not ideal. Adopt either or. V01 and V04 should be close together so that from one location you can close one and open the other.

This post has been edited by halcyon27: Aug 3 2018, 03:46 PM

If no water from main then water will be pump from tank right? Unless it's few days no water from main and the water tank empty by that time then water pump might damage if no water to pump? I'm not sure if my pump have dry run protection

Why the check valve need to be after pump?
Why simultaneous flow from main and tank not ideal?

Simultaneous flow creates a pressure build up along the pipes where there two flows will meet usually at the junction.

Check valves prevent contra (opposite) flow. On a cold inlet of a hot water storage heater it prevents the heater from running dry due to siphoning. In a solar heater in the roof, it prevents hot water being siphoned from its inlet into the cold water line to the end point when pump operates which can be disastrous if the cold pipe is not rated to withstand high temperature.

In all cases I've seen, check valves are located after pump but more importantly it's located at a hot water heater or solar water heater cold inlet.

This post has been edited by halcyon27: Aug 4 2018, 08:26 AM

that don't really answer the questions