Recent content by crosbie

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    Maximum deviation from horizontal before air lock?

    For the experiment, I should add that as the circuit is at 1m head pressure, then the supply tank (simulating a circulator of 5m head) would have to be at 3-3.5m and the end of the pipe would have to go up from the ground to a 1m high outflow.
  2. C

    Maximum deviation from horizontal before air lock?

    Thanks for the tips. I knew about the mains filling one, but shutting down rads to maximise flow through certain parts of the circuit is a good one. As to the key heights, unless someone with the requisite figures or formula posts them (eventually), I guess it may be a matter of setting up an...
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    Maximum deviation from horizontal before air lock?

    Yes, good practice avoids high points, so in pursuit of good practice (and a lack of problems), I need to know what a 'high point' is in terms of rise & fall height, and how high a high point has to be that a vent should be incorporated where one occurs.
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    Maximum deviation from horizontal before air lock?

    [spurious duplicate]
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    Maximum deviation from horizontal before air lock?

    I agree that there's no need to be sarcastic (I intended none). I'm not here for a flame war, but for informed advice & opinion. I agree that any air pocket could cause an issue, and that no size of air lock is ok. It's at what height of rise & fall that these things occur that's the mystery. :-/
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    Maximum deviation from horizontal before air lock?

    My system is open vented. I'm concerned that to avoid "Rise and fall to any degree" would require the use of a theodolite. I suppose I could pass a run of transparent polythene hose down the intended route, fill it with fizzy fluorescent yellow Gatorade and see which end bubbles drift toward...
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    Maximum deviation from horizontal before air lock?

    Thanks, but it's how one defines 'rise & fall' or how high a 'high point' is that concerns me. Is a 'rise & fall', a brief change in height of 1mm? 1cm? 10cm? What? As to automatic vents, I was assuming they'd be appropriate if a high point was in an awkward location.
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    Maximum deviation from horizontal before air lock?

    I know a level pipe will be fine, even at 30m. The hypothetical question (that influences how careful I'll be when it comes to installation) is what height of bump in the pipe ceases to be negligible and potentially can become a problem.
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    Maximum deviation from horizontal before air lock?

    For example, lets say there's a 10m stretch between two radiators, and the supply pipe is perfectly level, but for the need to temporarily rise H cm halfway between the two rads in order to avoid something (a steel girder say). Assume a circulation pump of 5m head (and consider that it regularly...
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    Maximum deviation from horizontal before air lock?

    In a pumped radiator circuit, in long horizontal-ish stretches of pipework (say 15mm dia), what's the maximum typical rise/fall before air pockets become persistent (aren't moved on by pumped flow) and cause noise/gurgling, and before air locks prevent flow? Apologies if this is a common query...
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    Anti-return or check valves on secondary circuit

    That's a good idea. Moreover, there is also a shut-off valve for the secondary from the shower, so I can close it, and see if it makes a difference. I may get round to posting a diagram of my water circuit in due course. Incidentally, it is a mains fed DHW supply, indirectly heated via a coil...
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    Anti-return or check valves on secondary circuit

    In my configuration, it's more like a star topology than a ring topology, and all the secondary pipes are joined together not far from the check valve at the pump. So, given that all secondaries can flow in both directions, by being fed from their respective primaries, I'm fairly confident it's...
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    Anti-return or check valves on secondary circuit

    I've only a single check valve before my circulating pump (for secondary DHW circuit). However, I've noticed a problem. When I have my pump turned off (to save heat loss), I find that for a given tap (especially the shower), when the hot water arrives, it is warm rather than hot, and only later...

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