32mm MDPE to brass double check valve?

[flanagaj]

I am trying to source the parts to install a temporary water supply on site.  Pipe is 32mm MDPE, and I need to put a double check valve in, but I balked at the cost of an MDPE one, and was thinking of going MDPE to brass dcv and then back to MDPE, before having a 90 degree elbow and tap.

 

So far, I've only found 

 

https://www.pipestock.com/double-check-valve-brass-threaded

https://www.pipestock.com/mdpe-male-adaptor

 

And wasn't sure whether a bspp male works with a bsp female and you simply don't need to use PTFE?

Edited November 11, 2024 by flanagaj

[Conor]

Reduce to 25mm MDPE. You can then fit a 25mm tap. You don't need 32mm for a site supply.

 

Do you need a double check valve? Surely if this is a new connection you'll have a modern meter box with integrated non return valve?

 

[flanagaj]

14 minutes ago, Conor said:

Reduce to 25mm MDPE. You can then fit a 25mm tap. You don't need 32mm for a site supply.

 

Do you need a double check valve? Surely if this is a new connection you'll have a modern meter box with integrated non return valve?

 

Southern Water sent me the attached diagram.

TBS Standpipe .pdf

[Nick Laslett]

@flanagaj, my standpipe was the first step in my plumbing journey. 
 

This is what I ordered to satisfy the Anglian Waters stand pipe requirement

Polyfast 32mm to 25mm Reducer

https://www.bes.co.uk/32-mm-x-25-mm-polyfast-mdpe-reducing-coupling-compression-9859/

 

Brass Stop Cock - 25mm MDPE to 15mm

https://www.bes.co.uk/brass-stop-cock-mdpe-x-copper-25mm-x-15mm-10484/

 

JG Speedfit Tee

https://www.bes.co.uk/jg-speedfit-push-fit-tee-15mm-7080/

 

Brass drain cock 15mm

https://www.bes.co.uk/drain-cock-type-a-15mm-brass-21822/

 

Brass Double Check valve 15mm

https://www.bes.co.uk/double-check-valve-non-return-15mm-dzr-8151/

90° tape connector elbow 
https://www.bes.co.uk/1-2in-bsp-x-15-mm-bent-tap-connector-jg-speedfit-push-fit-7090/

 

Brass Bib Tap 15mm

https://www.bes.co.uk/hose-union-bib-tap-1-2in-9317/

 

I also had to get tools, a piece of 15mm barrier pipe, piece of 25mm MDPE pipe, pipe inserts for 15mm, 32mm and 25mm. 
 

There is a very good thread on here already, which I based my purchases on, I will try to find it. 
 

*Edit here they are:

 

 

Edited November 11, 2024 by Nick Laslett

[JohnMo]

53 minutes ago, Conor said:

You don't need 32mm for a site supply.

Do you really need it for any domestic property unless your distance from mains to stop cock is about a mile or two.

[flanagaj]

3 minutes ago, JohnMo said:

Do you really need it for any domestic property unless your distance from mains to stop cock is about a mile or two.

I want a shower with a 50 litre/ minute flow rate

[JohnMo]

7 minutes ago, flanagaj said:

I want a shower with a 50 litre/ minute flow rate

That's nice for you.

Hope you aren't on a meter then. And have a BIG cylinder. 

Have a suitably rated drainage system 

And it doesn't comply with building regs.

[marshian]

6 minutes ago, flanagaj said:

I want a shower with a 50 litre/ minute flow rate

 

Wow that's a heck of a flow rate for a shower - last time I checked ours when looking at water consumption it was 9L per min and I regard that as a decent shower

 

I my concern for our house water usage I did fit a restrictor to reduce the flow to 6L per min and that was fine for me I couldn't notice the difference

 

SWMBO who also didn't notice started whining that it was taking longer to rinse her hair (shampoo and conditioner) so the pump must be going and I should replace it asap.................

 

I timed her showers with flow restrictor and without and it was a tiny reduction in water usage but it did increase the time in the shower by 50% and as I have to wait for her to finish in the shower before I can get in there I decided life was too damn short and I'd look for water savings elsewhere.

[flanagaj]

It was a joke.  Good point regarding the 32mm, but that part is done now, and I don't want to go back to Southern Water and get it changed.

[flanagaj]

https://www.bes.co.uk/shalloduct-water-service-pipe-insulation-835-x-32mm-19170/

 

£19 for 800mm foam!  They have stipulated a 4" external pipe with the internal pipe insulated.