Around gas pipes

[Gitarrist]

Hello!
We have an eroded wall and need help. I have bought 222 and FA 180 construction and wet room silicone.
The guy from the energy company said it was just a matter of chipping away and smearing 222 all the way onto the pipe. There is cork further inside the wall, to the right in the hole. We can't afford to drain.
Four questions:
1. Since it's some kind of experimental concrete in the wall from 1934, which eats itself up, it doesn't seem so smart, does it?
2. Should I have cork around the pipe?
3. If it's a bad idea to smear directly on the concrete, and cork is wrong, what material should I use then?
4. Do you have any other tips before I tackle it?
Thank you very much for the help!

Kind regards
G

 

[David-O]

Is it a pipe with flammable gas?
Is some form of fire sealing required?

To repair plaster/cement/concrete, I would recommend husfix (or for example weber maxfix) which is cement-based.
Silicone-based sounds like a bad idea unless there is something special about the gas pipe?

And where does drainage come into the picture?
I would think water is worse for the pipe than whatever you seal with.

 

[David-O]

Incidentally, it resembles my basement wall of cement and large stones. It also weathers. Generally, you should not apply a harder mortar on top of a softer one, so skip concrete.

 

[justusandersson]

The cork is insulation on the inside of the concrete wall. Inside of that, there's plaster that has deteriorated due to moisture. You might be able to push some mineral wool around the pipe where the cork is and then fill it up with a soft mortar that doesn't contain cement. I've never encountered any specific fireproofing around gas pipes.

 

[Gitarrist]

Is it a pipe with flammable gas?
Is any form of fireproofing required?

To repair plaster/cement/concrete, I would recommend husfix (or for example, weber maxfix) which is cement-based.
Silicone-based sounds like a bad idea unless there's something special about the gas pipe?

And where does drainage come into the picture?
I would think water is worse for the pipe than whatever you seal with.

Thanks

 

[Gitarrist]

Resembles my basement wall of cement and large gray stones. It's also weathering. Generally, you shouldn't apply a harder mortar on top of a softer one, so skip concrete.

Oh dear.

 

[Gitarrist]

The cork is thermal insulation on the inside of the concrete wall. Inside that, there is plaster that has deteriorated due to moisture. You can probably push in some mineral wool around the pipe where the cork is and then fill it up with a soft mortar that does not contain cement. I have never encountered any specific fireproofing around gas pipes.

Thanks!