Pipe-in-pipe

[oldkettle]

While watching other people work on YouTube I saw something that makes a lot of sense to me - pipe-in-pipe flexible water feed which basically guarantees if an internal pipe starts leaking it will just drain into the external one and out. Ran a search here and found nothing - maybe used wrong terms. Is there any reason not to use it for anything running inside a wall? Or is it just not well known? 

Edited February 5, 2023 by oldkettle

[dpmiller]

why would a pipe start leaking?

[oldkettle]

8 minutes ago, dpmiller said:

why would a pipe start leaking?

 

No idea. Manufacturing defect, degradation with time due to temperature changes, chemicals in water? 

 

BTW, watched further and the guy points out it is also possible to replace the leaking pipe without getting behind the wall. I am sold TBH. I always look at how something is to be serviced once things inevitably go wrong. 

[markc]

It’s called ducting, certainly nothing new. 

[Gone West]

2 hours ago, oldkettle said:

Is there any reason not to use it for anything running inside a wall?

 

I used it for all my pipe runs from the manifold to the various appliances. You can just see the red ducting for some of the hot water feeds.

 

 

 

[oldkettle]

4 hours ago, markc said:

It’s called ducting, certainly nothing new. 

 

Not sure. Ducting - usually - is just a sleeve which facilitates feeding a cable or a pipe through. This one also prevents leaks by draining them by design. 

Anyway, seems to be something they use in Sweden. 

[Onoff]

Pipe in pipe? I had that done on Monday!

[Nickfromwales]

 

Is there any way we can destroy this picture? This immaculate bit of plumbing excellence is giving me an inferiority complex. I'd only just started to go outdoors again, and here the bloody thing is again.

Tidy.  

[Nickfromwales]

7 hours ago, Onoff said:

Pipe in pipe? I had that done on Monday!

Just spat my beer out. PMSL x3 🤣

[Iceverge]

On 05/02/2023 at 13:40, oldkettle said:

While watching other people work on YouTube

That Swedish guy Mindsparx?

[Onoff]

9 hours ago, Nickfromwales said:

Just spat my beer out. PMSL x3 🤣

 

As I've said, I'm living proof 22mm does go into 15!

[Nickfromwales]

4 minutes ago, Onoff said:

 

As I've said, I'm living proof 22mm does go into 15!

Ouch. 

[Pocster]

6 hours ago, Onoff said:

 

As I've said, I'm living proof 22mm does go into 15!

Sore 

[oldkettle]

15 hours ago, Iceverge said:

That Swedish guy Mindsparx?

 

Yes, for this specific tip. But there are a few I started following because it's easier than actually doing anything. 

[Onoff]

2 hours ago, pocster said:

Sore 

 

Nah, couldn't look, didn't see a thing. 

[JohnMo]

I've use pipe in pipe, but not on anything domestic.  Marine diesels use pipe in pipe if the pipe, should it leak, would allow fuel or lubricant on the turbo charger or exhaust system.

 

Don't really see any reason to waste your money in a domestic situation for water.

[Onoff]

I have run some 15mm Pex/PB inside 25mm galv electrical conduit. This was in the corner of a wall but that was more for mechanical protection against someone deciding it would be a good spot for a shelf bracket. It'd be a bit moot if someone decides to use a Bosch multi construction bit!