Sleeve for 28mm pipe

[hotponyshoes]

I wouldn't sleave it in Alloy.
Even if they don't react I can see the inside of the alloy condensating and growing corrosion. And aluminium corrosion can be nasty sharp pointy stuff.

Why not just stick the copper in, wrap a couple of strips of cardboard around each end of the plain copper and stuff them up in the hole to center it then fill up the outsides with sealer.
If you have to rip it out and replace it in 10yrs time it's not the end of the world.

Or, I might have some thin wall heatshrink that will roll up to go in the post

 

[Screwdriver]

Rifling through the back of the end shed where my scrap metal is, I have found some aluminium tube. Its about 31-32mm diameter and the inside is about 28.5mm. The 28mm copper pipe will slide inside it. So, I could run this in the hole and then the copper pipe inside it. Would there be any issues with this? Do aluminium and copper corrode when in contact with each other? Is the very snug fit a problem as the copper heats and expands?

Failing that, I might just order a length of this - https://www.jtmplumbing.co.uk/pipe-...low-coated-copper-pipe-straight-lengths-p7248. I measured the hole and its 1070mm needed so one length will do the job.

@hotponyshoes - thanks for that - I wont be passing till mid January now but I appreciate the offer.

For galvanic corrosion, you couldn't pick two worse materials.

That's a "no" from me I'm afraid.

You used to be able to get that icky gooey tape that plumbers used to wrap around pipework. Don't think that's what it's called but you know what I mean...

 

[scottmk1]

Denso tape?

 

[Screwdriver]

Denso tape?

Yeah that's the fella. Give yourself a biscuit.

 

[reb78]

Glad I asked about the ali/copper combo! Sounds like that would have been a bad idea.

So I have gone for a length of that plastic coated pipe I linked to earlier. It wasnt cheap but peace of mind on these two bits of pipe will be worth it. Its about 30mm total diameter and the coating is tough.

Good review for the company I linked to selling it as well. They were cheapest I could find, answered my query about the overall diameter within an hour or so. Order placed at about 1530 and with me by midday the next day. I stuck some tubes of silicone on the order to get the free delivery.

 

[reb78]

Or, I might have some thin wall heatshrink that will roll up to go in the post

Thanks for that. Appreciate the offer. The plastic covering on the pipe i have bought will be pretty tough - I was a little worried about whether heatshrink would tear.

 

[hotponyshoes]

Thanks for that. Appreciate the offer. The plastic covering on the pipe i have bought will be pretty tough - I was a little worried about whether heatshrink would tear.

The thick wall stuff won't.
I use it on horsebox stuff and they struggle to chew through it!

You need a pretty good heat gun to shrink it down though plus it's in 1m ridgid lengths so not particularly economical to post!

 

[Pigeon_Droppings2]

I was a little worried about whether heatshrink would tear.

A bit of damp proof membrane might work....it's tough plastic and designed to last a long time!

I've got an outside tap to do this week....am thinking about doing it in plastic pipe instead of copper....dunno if 28mm plastic is an option for what you are doing...maybe just thro the wall. Plastic will require a lot less expansion room than copper.

 

[reb78]

A bit of damp proof membrane might work....it's tough plastic and designed to last a long time!

I've got an outside tap to do this week....am thinking about doing it in plastic pipe instead of copper....dunno if 28mm plastic is an option for what you are doing...maybe just thro the wall. Plastic will require a lot less expansion room than copper.

Its flow and return for a rayburn. Should sit around 80 ish C but has tge potential to go quite a bit hotter on the flow so the plumber is worried it might get near/above the heat limit for plastic pipe. Hence the need for copper.

 

[reb78]

The thick wall stuff won't.
I use it on horsebox stuff and they struggle to chew through it!

You need a pretty good heat gun to shrink it down though plus it's in 1m ridgid lengths so not particularly economical to post!

ah! Pretty tough stuff then. I will bear that in mind when swmbo asks me to do something with her horse trailer where it might be needed!

 

[gaz1]

to be honest reb you dont need anything

your hole is too small anyway for a proper heat shielding from the walls and to protect properly

my advice is fit the pipe into the wall and just use the fire foam instead normal wall foam will do as well

if you want to protect it and allow for expansion use exhaust wrap

if you want to center that pipe just use 2mm wedges on 4 sides of the pipe and foam it up that will center the pipe in the middle of the hole then pull the wedges out
it will allow 2mm of expansion in all directions

 

[Pigeon_Droppings2]

Yea I suspected it might be high temp stuff....I wouldn't risk it with plastic either.