Hi,
[Apologies if this has been requested before - I see quite a few pipe sizing questions but not much on plastic variants]
I am about to install new hot and cold pipework for a new floor on a house in Switzerland. This will involve:
- Running H & C supply up two floors from basement to 1st manifold - roughly 4m rise.
- 3m runs from this to main Bathroom Bath/Shower/Basin/WC.
- Another trunk line from 1st manifold to 2nd manifold (4m) and ensuite items (Shower/Basin/WC).
I prefer manifolds over trunk/branch to avoid burying any junctions in walls or floors.
This is a very simplistic schematic - sorry for the lack of 3D or or other details but I didn't have time to do something more sophisticated.
We have a vented HW tank in basement, with both H &C are fairly balanced pressure of at least 4 bar.
I've settled on using Geberit Mepla PEX/alu/PEX pipework as it seems to be increasingly the standard here. As the new extension is entirely in wood, not waving a blowtorch about is also quite appealing.
So (finally) to my question!
Mepla comes in three smaller 'domestic' sizes with outside (inside) diameters in mm of 16(11.5) , 20 (15), 26 (20) : http://catalog.geberit.com/public/product.aspx?cat=GB_GB-en_1&ch=212&p=38107
Starting from the 'rule of thumb' for 22mm/15mm copper pipes I've seen quoted/in books and matching inside diameters, these would be the closest match:
- 26mm Mepla for supply lines, bath & shower
- 20mm Mepla for basin & WC
However given the layout, the fact there are very few/no junctions on pipes to create pressure drops, and based on other installations I've seen I suspect the pipe sizes are excessive. I'm leaning more towards using 20mm & 16mm instead. Current shower on ground floor has a 20mm plastic pipe for some of it's run and has very acceptable pressure & flow.
Can anyone give me some advice / thoughts on this, or direct me to a good resource?
Thanks very much
Richard
[Apologies if this has been requested before - I see quite a few pipe sizing questions but not much on plastic variants]
I am about to install new hot and cold pipework for a new floor on a house in Switzerland. This will involve:
- Running H & C supply up two floors from basement to 1st manifold - roughly 4m rise.
- 3m runs from this to main Bathroom Bath/Shower/Basin/WC.
- Another trunk line from 1st manifold to 2nd manifold (4m) and ensuite items (Shower/Basin/WC).
I prefer manifolds over trunk/branch to avoid burying any junctions in walls or floors.
This is a very simplistic schematic - sorry for the lack of 3D or or other details but I didn't have time to do something more sophisticated.
We have a vented HW tank in basement, with both H &C are fairly balanced pressure of at least 4 bar.
I've settled on using Geberit Mepla PEX/alu/PEX pipework as it seems to be increasingly the standard here. As the new extension is entirely in wood, not waving a blowtorch about is also quite appealing.
So (finally) to my question!
Mepla comes in three smaller 'domestic' sizes with outside (inside) diameters in mm of 16(11.5) , 20 (15), 26 (20) : http://catalog.geberit.com/public/product.aspx?cat=GB_GB-en_1&ch=212&p=38107
Starting from the 'rule of thumb' for 22mm/15mm copper pipes I've seen quoted/in books and matching inside diameters, these would be the closest match:
- 26mm Mepla for supply lines, bath & shower
- 20mm Mepla for basin & WC
However given the layout, the fact there are very few/no junctions on pipes to create pressure drops, and based on other installations I've seen I suspect the pipe sizes are excessive. I'm leaning more towards using 20mm & 16mm instead. Current shower on ground floor has a 20mm plastic pipe for some of it's run and has very acceptable pressure & flow.
Can anyone give me some advice / thoughts on this, or direct me to a good resource?
Thanks very much
Richard