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bonding a short section of water supply pipe

wallywombat
In a victorian terrace house, a lead water supply pipe enters the damp cellar, runs about a meter along the wall to the main brass stopcock, then converts to plastic pipe before exiting the cellar to the rest of the house (which is likely to be a mixture of copper and plastic). The stopcock is a couple of feet away from the CU. Should the supply pipe be bonded? My feeling is no, but I'd be interested in other opinions.


While I'm on the subject, a more general question. Why must any bonding be done after the main stopcock? For example where the supply tees off immediately after the stopcock, is it better to bond one of the tees, or bond just before the stopcock? Where there is a long run of supply pipe before the stopcock, is it better to bond after, with a long MPBC run back to the MET, or bond it near the MET even where that's before the stopcock?
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    PME was never a good idea, it is a bodge. But we are stuck with it now it seems, more patches on patches.


    This thread seems to have got to a ridiculous point, whilst there MAY BE a theoretical risk of a bond carrying hundreds of Amps for an extended period, I have never seen one in any way melted or fused, and I expect this is the same for everyone here. The risk imagined by Zoomup is not reasonable, this simply does not happen, and with plastic service pipes and mains never will in the future.


    If you want something to worry about, consider the MAD idea to distribute Hydrogen in the Gas system. First Hydrogen causes embrittlement to steel pipes and leaks through the smallest space in fittings, valves, etc. When it leaks it is very dangerous due to lack of any smell (the Hydrogen will leak out but not the smell gas), and it forms a fairly wide range of explosive mixtures with Air. It is also debatable whether it will leak through plastic pipes even with fusion joins, which is most of the Gas distribution system. The metal plumbing in most houses with compression joints will probably leak to some extent, and most appliances with valves almost certainly will, because the Hydrogen will react with the grease which is used for the moving part seals. Again we see that those in positions of power as so bereft of knowledge that they make suggestions that are impractical on simple Engineering grounds. They then say that Engineers should invent something to make them actually work! Electric everything is unworkable unless we have many years and "a magic money tree". Hydrogen is dangerously unworkable and very energy inefficient. Batteries are a serious problem in the supply of materials, the danger of fire, and the inability to recycle them economically. Heat pumps are too complex, very expensive, not very efficient at winter temperatures, and air source ones noisy. If you want an instant problem ask a GREEN politician, so green they know nothing!


    Now all that is really something to worry about because they are hell-bent on wrecking our entire infrastructure and lifestyle!


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  • 0
    PME was never a good idea, it is a bodge. But we are stuck with it now it seems, more patches on patches.


    This thread seems to have got to a ridiculous point, whilst there MAY BE a theoretical risk of a bond carrying hundreds of Amps for an extended period, I have never seen one in any way melted or fused, and I expect this is the same for everyone here. The risk imagined by Zoomup is not reasonable, this simply does not happen, and with plastic service pipes and mains never will in the future.


    If you want something to worry about, consider the MAD idea to distribute Hydrogen in the Gas system. First Hydrogen causes embrittlement to steel pipes and leaks through the smallest space in fittings, valves, etc. When it leaks it is very dangerous due to lack of any smell (the Hydrogen will leak out but not the smell gas), and it forms a fairly wide range of explosive mixtures with Air. It is also debatable whether it will leak through plastic pipes even with fusion joins, which is most of the Gas distribution system. The metal plumbing in most houses with compression joints will probably leak to some extent, and most appliances with valves almost certainly will, because the Hydrogen will react with the grease which is used for the moving part seals. Again we see that those in positions of power as so bereft of knowledge that they make suggestions that are impractical on simple Engineering grounds. They then say that Engineers should invent something to make them actually work! Electric everything is unworkable unless we have many years and "a magic money tree". Hydrogen is dangerously unworkable and very energy inefficient. Batteries are a serious problem in the supply of materials, the danger of fire, and the inability to recycle them economically. Heat pumps are too complex, very expensive, not very efficient at winter temperatures, and air source ones noisy. If you want an instant problem ask a GREEN politician, so green they know nothing!


    Now all that is really something to worry about because they are hell-bent on wrecking our entire infrastructure and lifestyle!


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