What size pipe is this?

[GreyBana]

This is the rising main into my property (the spectacular image below). After the conclusion reached in my previous post, I'm looking at replacing the (currently 15mm) feed with 22mm throughout the house; this requires me to change the main stopcock, as the stopcock itself goes from this blue pipe (MDPE?), straight to 15mm copper (like this).

For whatever reason, I had assumed that this MDPE was 25mm in diameter, but after measuring the circumference (below) at about 65mm, it's looking like it's 20.7mm in diameter. If it was 25mm diameter pipe, I'd be looking at closer to 75.5mm circumference and my measuring isn't that far out!

I assume it's probably 20mm, but I don't see anything that would allow me to go from 20mm MDPE to 22mm copper/plastic. I assume there's some adapter or insert or something that I need to take a 25mm to 22mm stopcock down to 20mm to 22mm?

It's also got me thinking that the wall thickness of the MDPE probably isn't too far off 2.5mm (I'm guessing, I have no experience here), which would give an inner diameter of about 15mm... therefore, I guess I'm also back at the original question of whether it's worth the effort?

Any help would be greatly appreciated

 

[kidgreen61]

20mm

 

[GreyBana]

Thanks for confirming. Any chance you could comment on the other bits?

I assume there's some adapter or insert or something that I need to take a 25mm to 22mm stopcock down to 20mm to 22mm?

It's also got me thinking that the wall thickness of the MDPE probably isn't too far off 2.5mm (I'm guessing, I have no experience here), which would give an inner diameter of about 15mm... therefore, I guess I'm also back at the original question of whether it's worth the effort?

 

[avonmouth]

20mm MDP has an internal bore of 15.2mm

 

[GreyBana]

Thanks for the info, should have thought to look it up myself. The below are the copper pipe dimensions if anyone else ever comes across this.

15mm copper has an inner diameter of 15 - (0.7 x 2) = 13.6mm.

Upgrading from the existing 15mm to 22mm would only give me another 1.6mm (15.2 - 13.6) of inner diameter, but...:

13.6mm inner diameter = 581mm2
15.2mm inner diameter = 726mm2

That is still a 25% increase in size...

25% seems like a non-trivial amount. So I may still upgrade, but I'm still unsure on how I'd go from the 20mm MDPE to 22mm copper/plastic?

source

 

[Madrab]

I don't see anything that would allow me to go from 20mm MDPE to 22mm copper/plastic.

https://www.diy.com/departments/mdpe-fittings-to-copper-pipe-connectors-20mm-straight-22mm-copper-/5060449709440_BQ.prd

Basically a 20mm MDPE to 3/4" female with a 3/4" male to 22mm compression

 

[GreyBana]

Thanks, I've also since found this that looks like it would do the job too:

Amazon.co.uk

Any reason to prefer one over the other?

 

[Madrab]

None at all, that I can see.

 

[GreyBana]

Thanks! Now I've just got to execute on the plan!

 

[dilalio]

Thanks! Now I've just got to execute on the plan!

What is your purpose doing this?
If you have poor flow and pressure from the supplier, then upgrading your 15 won't make much difference.

Ask supplier to check your flow and pressure at their stopcock and compare it against measurements at your stopcock.