Attic cold water tank - anti-freeze measures?

[Onoff]

57 minutes ago, readiescards said:

Sorted through a few boxes on the farm and got it connected - easy peazy this plumbing lark!

 

Especially when @Nickfromwaleshas our backs!

[readiescards]

Went back 5 hours later and pressure had fallen to 6 bar - odd given there is a one way check valve in the system and no obvious leak.

 

Does 6-7 bar mean there is enough pressure not to worry about cold water tanks in loft etc?

[ProDave]

That is plenty of pressure. The "leak" is probably the NRV being imperfect as there is no reservoir for it to charge up.

 

I would say you are good to go with an accumulator.
 

[readiescards]

I hope so!

 

The zero-flow pressure is good, but it quickly tails off when opening a tap, as per this video

https://dl.dropboxusercontent.com/u/55058337/2016-11-10 08.06.52.mp4

 

Still viable to avoid the cold water tank option?

 

[Nickfromwales]

3 hours ago, readiescards said:

I hope so!

 

The zero-flow pressure is good, but it quickly tails off when opening a tap, as per this video

https://dl.dropboxusercontent.com/u/55058337/2016-11-10 08.06.52.mp4

 

Still viable to avoid the cold water tank option?

 

The dynamic pressure and dire flow rate are irrelevant as you know you need to reinforce it by whatever means . 

Id fit an accumulator, as Dave says, and size it around 500ltr ( so around 300ltr useable water volume ) and fit a pressure reducing valve set to around 4.5 bar. 

The important thing now is to plumb the house accordingly in anticipation of an acc being installed. 

Can you get a pipe between the garage and the house easily enough so the vessels can go in the garage out of the way?

[Nickfromwales]

FYI the video shows the mdpe pipe acting exactly as the accumulator would, just with near zero means to hold the pressure for any meaningful period. The pipe is swelling slightly under static pressure and 'inflating' ever so slightly. The tap being opened just releases that tiny bit of stored energy and then it's back to normal dynamic potential. 

The accumulator would offer a means to store that energy but with much greater capacity and sustain. 

[readiescards]

Brilliant I'm beginning to understand now. Yes easy to get pipe from garage to house with room for large tank. got a link to an accumulator I can see specs on please?