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PostPosted: Tue Sep 26, 2017 1:30 pm 
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Can I replace old leaking central heating pipes (about 1.5 inch diameter at a guess) that go under the carpet and floorboards for a distance of perhaps 20 feetm without taking everything up?

This section of pipe ends at the hot water cylinder and begins about 15 feet from the boiler itself.

Do I need to replace it with an equivalent gauge length of piping and does it have to be made of the same material (rusty steel about 50 years old) or is it best to replace everything from the boiler up as far as the cylinder(there are quite a few corners to navigate?


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PostPosted: Tue Sep 26, 2017 5:59 pm 
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1. If its 1 1/2" steel pipe it suggests it was (originally?) a gravity system. With a pumped system you wouldn't need anything like that size for a normal property.
2. Try to avoid mixing steel and copper on a system, as you will get galvanic action causing corrosion.
3. Any replacement pipe, whether copper, plastic or steel, will need to be clipped at regular intervals. This suggest the floor will have to come up to install the pipe and clips, and also to remove the steel pipe if this is a requirement.
4. The nearest equivalent copper pipe size is 35mm, but note point 1 above.
5. I don't think anyone makes 35mm plastic pipe, 28mm seems to be the maximum.
6. The 1 to 2 metres of pipe nearest to the boiler needs to be copper (or steel, not plastic).
7. I think you'd be advised to get a professional to look at what you've got and advise the best route forward.


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PostPosted: Tue Sep 26, 2017 6:32 pm 
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andy48 wrote:
1. If its 1 1/2" steel pipe it suggests it was (originally?) a gravity system. With a pumped system you wouldn't need anything like that size for a normal property.
2. Try to avoid mixing steel and copper on a system, as you will get galvanic action causing corrosion.
3. Any replacement pipe, whether copper, plastic or steel, will need to be clipped at regular intervals. This suggest the floor will have to come up to install the pipe and clips, and also to remove the steel pipe if this is a requirement.
4. The nearest equivalent copper pipe size is 35mm, but note point 1 above.
5. I don't think anyone makes 35mm plastic pipe, 28mm seems to be the maximum.
6. The 1 to 2 metres of pipe nearest to the boiler needs to be copper (or steel, not plastic).
7. I think you'd be advised to get a professional to look at what you've got and advise the best route forward.

Thanks, very much appreciated.


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PostPosted: Wed Sep 27, 2017 8:01 am 
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If the pipes have rotted through in one spot, then chances are they are waiting to rot through in another place as well.

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www.drlgas.co.uk


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