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    Myson TRVs - are they any good?

    Myson TRV are fine. I don't think that they are actually made by Myson anymore but they are still better than the real cheap ones. The more expensive ones have a faster response, less resistance to flow, tend to make less noise and don't seize up so easily. If properly fitted, Myson are about...
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    22 x 22 x 15 OR 22 x 15 x 22 ?

    Isn't the moderator supposed to say at this point : Please see rule no. 9 or something similar..... anyway I thought tallow was sold by weight not volume. I tend to think big distances in miles, medium ones in feet and inches but small ones in millimetres. Volumes in m2, gallons, pints...
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    Extractor ducting condensation run off

    Why is a condensate trap required in a vertical duct? Surely the wetness that does condense out of the air stream will run down the duct wall and fall back into the shower enclosure.
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    Oso vs Megaflow

    I cant see any reason for putting two domestic boilers in tandem - to do it properly you will need sequencing control which most domestic boilers are not compatible with. Why not just put a larger boiler in if you have such a big heat load - You can get wall hung boilers up to 120kW now, and in...
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    Standard iron size?

    If it's iron the od range for 1/2" is 21.1 to 21.7mm with galvanising you can add another 0.1mm. If it is old then galvanising will be pitted and rusty in places. If you cant see any screwed joints, are you sure it's not lead? - try scratching it with a blade. ~If it is iron the joint threads...
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    I Need to make something for my business

    You may be able to use a centrifugal filter. Printing ink is strange stuff, thixotropic, in fact which means that it behaves differently to water when you try to pump it. It has a very high shear stress so centrifugal pumps will tend to spin without actually moving much fluid; pumps for printing...
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    self defeating chillers? in this weather?

    Crafty - I am guessing, but the reason that self contained chillers have been installed is probably to do with the refrigerant. If the original system is more than say 5 years old, it is likely to have R22 in it. No modern kit is made for R22 anymore, it's all R410A or 407C (zero ozone depletion...
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    Which hot water boiler - electric or LPG?

    Zip do a 13 kw instantaneous heater : ILX12 is the largest for a single phase supply. (about 60A). - Should be fine for your intended use, it's tiny to at 330 x 210 x 110.
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    Copper water pipe covers/sheafs.

    B&Q sell chromed plastic split sleeves for 15mm pipe in 1m lengths, finish off with chromed plasic or brass wall/floor plates - all for less than a tenner.
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    Outdoor Lockable Taps

    Stinkwheel (anything to do with Stinkwheel MCC ?) - you could fit one to an Ital but it would look a bit silly, it might double the value of the car though...
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    Outdoor Lockable Taps

    If you want a proper lockable tap have a look at Edwards Standpipes on the interweb, we use them for marinas, caravan parks etc.
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    Guestimating Water Pressure?

    Ian, The rate of jug filling is not a proper indicator of pressure. The thressure is used to drive the volume of water through the resistance imposed by your pipes, valves and taps. As a VERY rough guide; unless you are a champion arm wrestler or similar, if you can hold your thumb over...
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    Back boiler conversion

    It's just aa bit of physics: The maths for the quoted recovery time ddoes work ie. 120 x 70% = 84l 84 x 4.2 x 45 = 15876 15876/(60 x 23) = 11.5 kW BUT incoming water temperature is unlikely to be as high as 15 deg, except during heat waves, much more likely to be around 10 deg...
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    low flow lockshield valve

    Whistling valves are often a problem when trying to squeeze flow rates. I always specify good quality valves : Samson ones have a contoured seat which seems to work well. Others worth the extra expense are Oventropp and Herz. Why not use a proper flow control valve such as a double regulating or...
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    Wood for bossing mallets

    If you go to car boot sales, look out for old skittles sets - I don't know what wood is used for these (possibly beech) but they can make really good mallet heads. Bowling balls used to be made from lignum but I suspect most modern ones are resin.
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    Lead Pipe Mains Supply

    nstreet : yes, there are ways of replacing buried pipework in-situ. for larger sizes, pipeline bursting is used where a 'pig' is forced through the existing pipe, tearing it apart as it goes, the pig pulls a plastic (mdpe) replacement pipe behind it. Another method, used by water companies...
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    bra wire

    If the AEG has a plastic outer drum (I think some have) you could try to locate the wire with a strong magnet and possibly move to the front in order to get to it through the drum seal. I had a similar problem years ago, cant remember the make of machine but it had a galvanised steel outer...
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    Purpose of Gate valve on hot-water tank

    Just a couple of points here.. The resistance of a gate valve is not particularly proportional to the position of the gate ie. at half open flow will not be restricted to 50% to get 50% typical gate valves would need to be about 15% open. Gate valves should not be used for balancing for this...
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    Mira 80 leak

    Andy, the internals of mira mixers can be replaced, you can buy service kits from good plumbers merchants or direct from Mira. For the spindle sealing there is an O-ring which you get with the service kit. To get the thing apart you need to pull off the outer and inner control knobs and...
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    Uncombining a Combi?

    Thanks Dark.. The shower works really well from the combi ar the moment as long as no toilets are flushed or taps opened within a 5 mile radius so I'll keep that and perhaps the washing machine on the combi and use the cylinder for the rest, with S-plan as you suggest - I'm sure I have an auto...
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