Reducing water pump pipe from 1" to ½"?

[Dellian]

I'm getting nowhere searching and translating Pantip plaza and I could use some help.

 

The municipal water is always shutting off and I want to install some water tanks and a pump. Everything on my property is unfortunately ½" pipe. From the tanks to the pump it will be a 1" pipe that will then need to be reduced to attach to the house. The house is a single story with 2 bathrooms, a kitchen and a laundry. We have a large garden that gets watered everyday. 

 

The concerns and questions I have are:

Does reducing the pipe size mean I need to be mindful of how powerful the pump is? (I was thinking a Hitachi 250W but now erring on the side of a 150W/200W)

Can I reduce the pipe size soon after the pump? (there are pavers surrounding the house that will make replacing the existing ½" pipe a nightmare of a job)

Would it be better(safe?) to just reduce the inlet and outlet of the pump?

 

I've attached a rough diagram that shows I have a dedicated pipe surrounding the property for the garden and the mainline that will connect straight to the house. 

 

Any help would be appreciated immensely. Thank you. 

 

[Artisi]

Just reduce the discharge pipe to 1/2" where ever it best suits you.

 

Best pump to consider is a constant pressure type, these runa lot smoother than the bladder type pumps. 

[Dante99]

11 hours ago, Dellian said:

Can I reduce the pipe size soon after the pump?

Yes you can but I think you would get better flow and pressure if you ran the 1” thru the two T fittings and reduced after those fittings.  So you would reduce on the right side of the T to he house and on both sides of the garden T.

[SLOWHAND225]

Just remember:
Bigger pipe = reduced pressure/more volume
Smaller pipe = higher pressure /reduced volume

 

You'd be better off to run 1" all the way to the point of use. ** if your pump is big enough.
Always better to have too much pump than not enough

[carlyai]

'Always better to have too much pump than not enough'

Just have to be mindful of the people that origionally installed the .5" pipe.

 

You don't want a pump too big that it could break one of the pipe joints that are under the cement and tiles.

My .5" water pipes were installed by local farmers who swore they had Dr Degree in Water Flow and pipes.

300 W pump and a few under cement leaks.