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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Selectring central heating pipe
Hi
I'm going to be using quite a bit of (22mm and 15mm) plastic barrier pipe for central heating and wondered if anyone can advise on the following. Q1. I used a coil of Speedfit a few years ago and it was a bu**er to work with because it was so springy and wanted to return to its coiled shape. Are coils of other makes any better in this respect (I have Hep2O and Equator in mind)? Q2. Presumably the different makes have slightly different internal diameters. I calculate that if an internal diameter increases, for example, from 11mm to 13mm then the internal cross-sectional area increases nearly 40% (area being proportional to diameter squared). This would give a significant reduction in resistance. Are any of the available barrier pipes of significantly greater internal diameters than their competitors? Cheers Steve |
#2
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Selectring central heating pipe
On 2008-08-02 13:13:51 +0100, "Steve" said:
Hi I'm going to be using quite a bit of (22mm and 15mm) plastic barrier pipe for central heating and wondered if anyone can advise on the following. Q1. I used a coil of Speedfit a few years ago and it was a bu**er to work with because it was so springy and wanted to return to its coiled shape. Are coils of other makes any better in this respect (I have Hep2O and Equator in mind)? Not really. Warming it can help a little but a better solution is just to buy straight 3 or 6m lengths. Q2. Presumably the different makes have slightly different internal diameters. I calculate that if an internal diameter increases, for example, from 11mm to 13mm then the internal cross-sectional area increases nearly 40% (area being proportional to diameter squared). This would give a significant reduction in resistance. Are any of the available barrier pipes of significantly greater internal diameters than their competitors? They are supposed to be standard according to the BS specs. The critical thing is to use the inserts that relate to the fittings as these are not interchangeble between brands Finally, it is advised to use a proper tube cutter and not a hacksaw for cutting the tube in order to retain system continence and your reputation. |
#3
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Selectring central heating pipe
In an earlier contribution to this discussion,
Andy Hall wrote: Finally, it is advised to use a proper tube cutter and not a hacksaw for cutting the tube in order to retain system continence and your reputation. Ecxept that one gentleman(?) whom we haven't seen much recently maintains *his* reputation *by* using a hacksaw! g -- Cheers, Roger ______ Email address maintained for newsgroup use only, and not regularly monitored.. Messages sent to it may not be read for several weeks. PLEASE REPLY TO NEWSGROUP! |
#4
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Selectring central heating pipe
"Andy Hall" wrote in message news:48945127@qaanaaq... On 2008-08-02 13:13:51 +0100, "Steve" said: Hi I'm going to be using quite a bit of (22mm and 15mm) plastic barrier pipe for central heating and wondered if anyone can advise on the following. Q1. I used a coil of Speedfit a few years ago and it was a bu**er to work with because it was so springy and wanted to return to its coiled shape. Are coils of other makes any better in this respect (I have Hep2O and Equator in mind)? Not really. Warming it can help a little but a better solution is just to buy straight 3 or 6m lengths. The JG speedfit is in my experence the most springy. I have never used Equador. I have used Hep 2O and PolyPlumb. They both seem easier to use than JG. I have no preference over either of these, but as the same person designed both Hep and Poly they are probably the same thing in all but name and patent numbers. Finally, it is advised to use a proper tube cutter and not a hacksaw for cutting the tube in order to retain system continence and your reputation. The JG Speedfit pipe cutter is the best I have used on any plastic pipe. Adam |
#5
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Selectring central heating pipe
On Sat, 02 Aug 2008 13:13:51 +0100, Steve wrote:
Hi I'm going to be using quite a bit of (22mm and 15mm) plastic barrier pipe for central heating and wondered if anyone can advise on the following. Q1. I used a coil of Speedfit a few years ago and it was a bu**er to work with because it was so springy and wanted to return to its coiled shape. Are coils of other makes any better in this respect (I have Hep2O and Equator in mind)? The JG Speedfit pipe is made using PEX which is a lot less flexible than Hep2O whcih is made using PB there is at least one other manufacturer that uses PB (PolyPlumb IIRC?). The difference is very marked. The 15mm PB stuff will nicely follow a 300mm radius without too much work. Q2. Presumably the different makes have slightly different internal diameters. I calculate that if an internal diameter increases, for example, from 11mm to 13mm then the internal cross-sectional area increases nearly 40% (area being proportional to diameter squared). This would give a significant reduction in resistance. Are any of the available barrier pipes of significantly greater internal diameters than their competitors? You must use the same manufacturer for the end supports as for the pipe. IME the PB pipes use stainless steel supports which offer less resistance than the plastic ones from JG (and others). I've not had an issue with the flow resistance of plastic pipe relative to Cu. -- Ed Sirett - Property maintainer and registered gas fitter. The FAQ for uk.diy is at http://www.diyfaq.org.uk Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html |
#6
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Selectring central heating pipe
"Steve" wrote in message ... Hi I'm going to be using quite a bit of (22mm and 15mm) plastic barrier pipe .. .. .. Thanks all. Very helpful. I'll be opting for the Hep2O. Cheers |
#7
Posted to uk.d-i-y
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Selectring central heating pipe
"Steve" wrote in message
... Hi I'm going to be using quite a bit of (22mm and 15mm) plastic barrier pipe for central heating and wondered if anyone can advise on the following. Q1. I used a coil of Speedfit a few years ago and it was a bu**er to work with because it was so springy and wanted to return to its coiled shape. Are coils of other makes any better in this respect (I have Hep2O and Equator in mind)? Q2. Presumably the different makes have slightly different internal diameters. I calculate that if an internal diameter increases, for example, from 11mm to 13mm then the internal cross-sectional area increases nearly 40% (area being proportional to diameter squared). This would give a significant reduction in resistance. Are any of the available barrier pipes of significantly greater internal diameters than their competitors? Cheers Steve Thanks all. Very helpful. I'll be using Hep2O. Steve |
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