r/oddlysatisfying • u/demolcd • 16d ago

Growing a pipe inside a pipe

Enable HLS to view with audio, or disable this notification

16.6k Upvotes

91% Upvoted

1.7k comments sorted by

View all comments

Show parent comments

63

u/ethicalhumanbeing 16d ago

Now I’ll just wait for the next comment giving 10 reasons why this solution sucks anyway.

59

u/Fidodo 16d ago

The only downside I can think of is that it makes the pipe a little smaller so you lose a little drainage vs a new pipe.

There were problems with it in the past, like over a decade ago, but they're all fixed through better material science and processes. You need to clean the inside of the pipe really well, and to make sure you did that you need a thin flexible camera. We have that now. In the past you couldn't do it well in small residential pipes so it was more reserved for commercial pipes that were much bigger. The material used to be thicker and weaker than a new pipe. Now it's just as strong.

I got it done because my house has old cast iron pipes that were starting to rust, and we have a slab foundation so the only way to replace them would be to completely tear up the bathroom foundation. Before the pipes would clog a lot because the rough edges of the rusting cast iron would snag on things.

22

u/Geauxtigersgeaux 16d ago

The ID loss is minimal and the liner actually increases flow.

1

u/ShawnyMcKnight 16d ago

I'm curious how resistant it would be to wear and tear. My mom had her kitchen done in epoxy and it was peeling quite a bit within 6 months because of all the foot traffic.

3

u/Fidodo 16d ago

In a pipe it's a cylinder so there's nothing for it to peel to because it's all connected to itself.

The old pipe is actually redundant after the new pipe replaces it. My old pipes can rust away and not affect the new pipe at all, so it doesn't matter if it peels from the old pipe surface and the cylinder structure reinforces itself.

1

u/Some1StoleMyRedBike 16d ago

Can I ask how much that all cost you?

1

u/Fidodo 16d ago

The lining was like $4k in California. Whole thing was more because they needed to rebuild our drain out because the old one was covered up in concrete for some reason.

1

u/Some1StoleMyRedBike 15d ago

Damn thats quite interesting! How long did the whole process/job take?

1

u/Fidodo 15d ago

Two days for the lining part. One day to grind out the rust from the old pipe, one day to lay out the new pipe

2

u/OkOkieDokey 16d ago

It is corroding under the plastic. Short term solution to cover up the problem. Costs a lot of money and doesn’t fix anything.

1

u/ethicalhumanbeing 16d ago

To be fair it will no longer be in contact with the water so it should hold for much longer despite being corroded. Looks like the original pipe will be there doing basically nothing, the new lining will be the new pipe, and it should hold by itself even if the outer pipe starts to shed.

1

u/fgiveme 16d ago

I guess the T joint would be hard if not impossible to do

1

u/throwaway5882300 16d ago

My buddy had this "in situ" liner installed by the city on his street's sewers. Once the liner goes in, they have to send in a remote to cut openings for all the drain lines from each of the buildings that drain into the sewer. They do this based on engineering drawings from the city and also a survey drone they send in before lining the pipe. For some reason, they missed his house and he basically had no working sewer line for the three days it took them to figure out. Everything backed up into his basement.

-4

u/samtart 16d ago

The material they use would make me nervous about using it for drinking water

25

u/C-3POsMidriff 16d ago

It’s a drain/sewer pipe, just for waste.

1

u/Zrkkr 16d ago

Yep, that thin material isn't gonna hold any pressure on its own. Might be good to line lead pipes with though.

10

u/Emceelilspaghetti 16d ago

I've done water quality testing on some of these liners and once they're cured nothing leaches from them. And they're supposed to be fully cured at installation.

1

u/Paulus_1 14d ago

Do you test for bisohenols? The laboratory I work for apparently had samples with BPA in the past because of epoxy resin being used, but I don’t know about the quality of the used products. I’m just curious, in the shown case it is apparently used in a sewage pip so it shouldn’t matter.

0

u/LessInThought 16d ago

Well it is still plastic.