Green Building Bible, Fourth Edition |
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Posted By: RexI plan to bury (only a few inches but sufficient to prevent damage and hide it) a pipe from close to the current eternal tap
Posted By: Rexclose to the current eternal tap
Posted By: Doubting_ThomasWe could tee off vertically from this point for a garden tapI did exactly this during my build. You can get MDPE to brass tap fittings with an inbuilt double check valve. I put a stopcock inline below the tap (in fact this might be what has the check valve in it). MDPE direct to tap pretty much eliminates damage due to frost but I always turn off the stopcock and open the tap when the weather is cold as water in the brass tap could in theory crack it.
Posted By: borpinMDPE direct to tap pretty much eliminates damage due to frost but I always turn off the stopcock and open the tap when the weather is cold as water in the brass tap could in theory crack it.
Posted By: RexI don't know the legal details, but if you are intending to have potable water from a garden standpipe, surely there is little to no chance of contamination working its way back along the pipe?
Posted By: RexIt was all installed during the build and the BCO never had any comments, so not overly worried.
Posted By: Mike1The consequences can also be serious. 20°C to 45°C is the ideal breeding temperature for legionella bacteria, and more-or-less the same temperature range that an outside tap / exposed pipe is likely to reach in the summer.
Posted By: Doubting_ThomasIs a non-return valve enough to stop this?
Posted By: revorQuite some time ago I had a discussion about check valves with some workers who were working on our mains in the road. I expressed a concern that I might end up getting dirty water from the farm across the road and whether they ever audited users to see if they had check valves. I was told not to concern myself as there was no risk, as the supply system ensured it could not happen. Whether this is general or just my area I do not know.
Posted By: owlmanperhaps into meters
Posted By: djhI suspect it all depends on the maintenance of continuous pressure to keep flows going the right way,That's my understanding. It's because that can fail that they're so keen to have air gaps or double check valves anywhere “wholesome” water comes close to mucky water, e.g., water in an open loft tank, in a bath or shower where it's been mixed with filthy humans or that's been standing for days in a hose. Those are both to prevent backflows within the home but also back into the public water supply.
Posted By: owlmanIt has me interested so I'll do some checking with an engineer friend who works in the industry.
Posted By: djhI suspect it all depends on the maintenance of continuous pressure