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Post by Mauro Andreini on May 27, 2020 18:32:55 GMT
I'm about to run water and heating pipes to what is going to be my new studio/garage building and trying to choose the type of pex for the job.
I would like to use blue and red for the cold and hot water but I have noticed that it only comes in 1/2" rather than 15mm.
Now, as I see pex and pex-al-pex in 15mm, 16mm and 1/2" sizes my question is simply . . . can I use 1/2" pex instead of 15mm pex?
Furthermore, is by any chance 16mm equal to 1/2" which is in fact 15.8mm ?
Many Thanks
Maz
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Post by rocketmanbkk on May 27, 2020 18:39:45 GMT
I'm about to run water and heating pipes to what is going to be my new studio/garage building and trying to choose the type of pex for the job.
I would like to use blue and red for the cold and hot water but I have noticed that it only comes in 1/2" rather than 15mm.
Now, as I see pex and pex-al-pex in 15mm, 16mm and 1/2" sizes my question is simply . . . can I use 1/2" pex instead of 15mm pex?
Furthermore, is by any chance 16mm equal to 1/2" which is in fact 15.8mm ?
Many Thanks |
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Post by dickpuller on May 27, 2020 19:00:33 GMT
It’s really depends on the availability of fittings the pipe you select.
15mm OD is the most common.
Are you looking at pre-insulated Pex perhaps?
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Post by logic28 on May 27, 2020 21:24:47 GMT
It’s really depends on the availability of fittings the pipe you select. 15mm OD is the most common. Are you looking at pre-insulated Pex perhaps? Thanks, I've had thoughts about that but I have to run everything inside a 110mm pipe for future potential servicing so my question remains the same, I hear that one can use 1/2" and 15mm interchangeably with the exact same fittings but, being an engineer, I consider 0.8mm quite a substantial increase in OD. Just hoping that someone has successfully done the same for confirmation. |
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Post by cylinderfella on May 27, 2020 21:32:49 GMT
16mm will not be equal to half inch. You'll need special fittings to join them together. How far are the pipes running to the new studio?
You might save yourself a lot of trouble by getting a separate boiler for the out building.
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Post by tomplum on May 28, 2020 8:01:28 GMT
Its not something I would consider, These ' vougue' systems are designed to make the manufactures wealthy, there are many advantages using traditional pipes and fittings and as Cylinder man says, you're making life difficult for the future and its going to cost more all through the project, But Hey, its your money, please take pics and show us how its going and at the end, you may well be able to say, na na na na, told you so, We are all here to learn and this is breaking new ground to me,  |
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Post by logic28 on May 28, 2020 9:09:26 GMT
16mm will not be equal to half inch. You'll need special fittings to join them together. How far are the pipes running to the new studio? You might save yourself a lot of trouble by getting a separate boiler for the out building. Thanks, I have a second diesel boiler, much bigger than the gas one indoors but it is my intention to run that as primary for both and keep the gas as a backup system hence the pipes running between buildings with adequate electrical switching valves . My question still stand, according to some, 15 mm and 1/2" can be used with the same fittings, just looking fore more testimonials after watching this: |
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Post by logic28 on May 28, 2020 9:21:52 GMT
Its not something I would consider, These ' vougue' systems are designed to make the manufactures wealthy, there are many advantages using traditional pipes and fittings and as Cylinder man says, you're making life difficult for the future and its going to cost more all through the project, But Hey, its your money, please take pics and show us how its going and at the end, you may well be able to say, na na na na, told you so, We are all here to learn and this is breaking new ground to me,  Traditional is the confusing issue here . . What is traditional and where ? Where I am in the Uk it seems to be 15 mm & 22 mm pex or copper (beside the mdpe in various sizes) in the USA its imperial 3/8" 1/2" 3/4" 1" etc same as in most parts of Europe . . so ? I have been confused by different opinions expecially after the video below just like to get to the bottom of it, not worried so much about which type I have to use. |
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Post by DIYDafty on May 28, 2020 12:35:21 GMT
Wow. Didn't realise what a huge difference the old pipe was. Clearly the new one was specified to improve flow rates. Hmmmmmmmm.......  Edit: And sorry OP I'm not qualified to answer your question although if it was me I'd do it in copper. |
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Post by cylinderfella on May 28, 2020 20:40:05 GMT
16mm will not be equal to half inch. You'll need special fittings to join them together. How far are the pipes running to the new studio? You might save yourself a lot of trouble by getting a separate boiler for the out building. Thanks, I have a second diesel boiler, much bigger than the gas one indoors but it is my intention to run that as primary for both and keep the gas as a backup system hence the pipes running between buildings with adequate electrical switching valves . My question still stand, according to some, 15 mm and 1/2" can be used with the same fittings, just looking fore more testimonials after watching this: You can mix the half inch with 15mm but be careful with 22mm mixed with three quarter inch. |
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Post by dickpuller on May 28, 2020 22:22:49 GMT
Just to confuse things a little more;
15,22,28mm are OD sizes & referred to as ‘Tube’.
1/2”, 3/4”,1” are ID sizes & referred to as ‘Pipe’.
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Post by tomplum on May 29, 2020 14:01:00 GMT
and if you like puzzles, 1/2 black alkthene is 3/4 dia then we can start on steel pipe sizes |
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Post by DIYDafty on May 29, 2020 15:44:35 GMT
I sent the link to Tom's tip on copper pipe thickness to my step dad. I got the question back " Do pin-hole leaks just occur by themselves, are they
they brought on by some physical stress?".
I said I thought/guessed that powerflushing and maybe "upgrading" to combi boiler might be the trigger but not 100% sure so would ask here. Do all the aggressive chemicals and crap in a heating system eat the copper over time too?
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Post by tomplum on May 29, 2020 18:49:23 GMT
my theory of pinholes , a combination of cheap chinese copper with ultra thin walls and active flux used on first fixing plumbing, The first fix plumbing was traditionally done before the floors went in, So it was months and maybe years, before any water was introduced into the pipes to flush it out, In that time the active flux was eating into the copper, years later pin holes formed,  |
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Post by DIYDafty on May 29, 2020 19:08:14 GMT
Sounds like those 1st fixers must have been pretty confident of their solders. Or maybe they'd air test them ?
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