oranjeboom Posted August 30, 2017 Share Posted August 30, 2017 In this 'renoextension' the original MDPE supply was 20mm which I had to pull out during structural works and now looking to pull back in. It's a private water supply coming in from landowner next door in 20mm MDPE (no chance to replace that all the way to source at the moment). Not noticed any issues with water pressure living in the static, but I recall reading somewhere on BH that it's probably best to opt for 22mm in the house itself (after stopcock) if there is a chance of low incoming pressure. The landowner next door rents out various commercial units units next door (so there is a potential for a drop in pressure but I haven’t noticed so far) so just want to insure myself against pressure issues. I need to get my UFH pressure tested soon, so just need a connection in the house again and may as well get it right from the very beginning. I was looking to go for 20mm MDPE to 22mm but options seemed very limited (though typically did find an option last night, typically here https://www.drainagepipe.co.uk/products/mdpe-water-pipe-fittings/mdpe-to-universal-copper-adaptor/20mm-x-15/22mm/) I can either stick with the 20mm MDPE or would it be best to replace my incoming MDPE from the boundary with 25mm? Not sure what I'm going for in terms of UVC, boiler, TS etc etc but was reading that 20mm is a safer bet (for runs to bath at least), but that will be more questions in another post. TIA Link to comment Share on other sites More sharing options...
Nickfromwales Posted August 30, 2017 Share Posted August 30, 2017 Can you do a flow rate. ? Get a bucket and a stopwatch. Link to comment Share on other sites More sharing options...
Onoff Posted August 30, 2017 Share Posted August 30, 2017 I've got 25mm coming up into a 22mm stopcock. It then tees off to an outside tap so no loss of pressure. Then a PRedV. Goes to 15mm at the mo. Will shortly change to 22mm. Link to comment Share on other sites More sharing options...
PeterW Posted August 30, 2017 Share Posted August 30, 2017 Go from 20mm MDPE to a 20/15 stopcock, then straight into a 15/22 copper reducer and run the rest in 22mm Negligible impact on flow as you've got a 100mm restriction at most. Link to comment Share on other sites More sharing options...
Gone West Posted August 30, 2017 Share Posted August 30, 2017 (edited) I have 20mm MDPE from under the road to our water meter and then into the bungalow. I have teed off that in 25mm MDPE to the new house and then used a 25mm MDPE to 22mm adapter. Edited August 30, 2017 by PeterStarck Link to comment Share on other sites More sharing options...
oranjeboom Posted August 30, 2017 Author Share Posted August 30, 2017 (edited) 3 hours ago, Nickfromwales said: Can you do a flow rate. ? Get a bucket and a stopwatch. I was hoping for an easy answer @Nickfromwalesas I did not want to venture out in this not so fine weather. But my flow rate a la bucket method is 14L in 20secs, so 42L/minute, so does not seem to be an issue. However, like I said, I have a number of commercial units next door so maybe the flow rate is improved by the landlord during the day, so I will do another test a bit later this evening. So okay to stick to the original 20mm MDPE? Edited August 30, 2017 by oranjeboom Link to comment Share on other sites More sharing options...
oranjeboom Posted August 31, 2017 Author Share Posted August 31, 2017 19 hours ago, Onoff said: I've got 25mm coming up into a 22mm stopcock. It then tees off to an outside tap so no loss of pressure. Then a PRedV. Goes to 15mm at the mo. Will shortly change to 22mm. Thanks! Those Honeywell's aren't cheap are they!!! Just found one on fleabay for around £17 (*unused*....) 16 hours ago, PeterStarck said: I have 20mm MDPE from under the road to our water meter and then into the bungalow. I have teed off that in 25mm MDPE to the new house and then used a 25mm MDPE to 22mm adapter. Well if it works for you! I thought there may be issues going from 20mm-->25mm MDPE and then 22mm. Off to the 'station to get my adaptors then! Link to comment Share on other sites More sharing options...
Onoff Posted August 31, 2017 Share Posted August 31, 2017 17 minutes ago, oranjeboom said: Thanks! Those Honeywell's aren't cheap are they!!! Just found one on fleabay for around £17 (*unused*....) I could not, for love not money get the 25mm MDPE to stopcock joint to seal until I got some Jet Blue Plus. http://www.plumbcenter.co.uk/product/center-center-jet-blue-plus-500-g/ Wouldn't use anything else now. Link to comment Share on other sites More sharing options...
oranjeboom Posted August 31, 2017 Author Share Posted August 31, 2017 2 hours ago, Onoff said: I could not, for love not money get the 25mm MDPE to stopcock joint to seal until I got some Jet Blue Plus. http://www.plumbcenter.co.uk/product/center-center-jet-blue-plus-500-g/ Wouldn't use anything else now. Now you tell me!! Just got back from the 'station. Actually, yes, I saw you had problems with yer plumbing in another post. Will see how/if mine has the same issues. Thanks! Link to comment Share on other sites More sharing options...
Nickfromwales Posted August 31, 2017 Share Posted August 31, 2017 Always best to use an mdpe stopcock on mdpe. . I'm an avid hater of anything ( metal ) compression going onto anything other than metal. The olives just chew through. 1 Link to comment Share on other sites More sharing options...
oranjeboom Posted September 4, 2017 Author Share Posted September 4, 2017 @Onoff I see that you installed the PRV vertically like I intend to also (MDPE up through the slab, then copper vertically up the whole into attic). However, now in receipt of my Honeywell PRV and I see the instructions state it can be fitted vertically or horizontally but "In vertical installation position spring bonnet with adjustment knob facing upwards". Not had a drop tonight but if I follow that instruction, then the flow in the PRV will be in the wrong (downwards) direction. Have you had any issues with this @Onoff? Wondering whether that will affect the pressure setting/reading and also debris collection filter? Maybe the resident plumber, @Nickfromwales can clarify? My preference is to have a nice straight run, rather than adding in a horizontal section. Link to comment Share on other sites More sharing options...
Onoff Posted September 4, 2017 Share Posted September 4, 2017 22 minutes ago, oranjeboom said: @Onoff I see that you installed the PRV vertically like I intend to also (MDPE up through the slab, then copper vertically up the whole into attic). However, now in receipt of my Honeywell PRV and I see the instructions state it can be fitted vertically or horizontally but "In vertical installation position spring bonnet with adjustment knob facing upwards". Not had a drop tonight but if I follow that instruction, then the flow in the PRV will be in the wrong (downwards) direction. Have you had any issues with this @Onoff? Wondering whether that will affect the pressure setting/reading and also debris collection filter? Maybe the resident plumber, @Nickfromwales can clarify? My preference is to have a nice straight run, rather than adding in a horizontal section. Problems, yes, it doesn't seem to be working properly as in it's bending the needle and twiddling the green knob doesn't seem to have any effect. Just assumed it needs a clean out which I've never done..... I might need a scan of your instructions! Link to comment Share on other sites More sharing options...
Nickfromwales Posted September 4, 2017 Share Posted September 4, 2017 Which valves have you got guys? There are many. Model & type please . Link to comment Share on other sites More sharing options...
oranjeboom Posted September 4, 2017 Author Share Posted September 4, 2017 1 minute ago, Nickfromwales said: Which valves have you got guys? There are many. Model & type please . Hi Nick. I have Honeywell D04FM. Yours the same @Onoff? If so, here are the instructions: http://www.honeywelluk.com/Documents/Installation-Guide/pdf/d04fm-ii-mu1h1054ge23r0215.pdf Page 4 section 5.1..... Link to comment Share on other sites More sharing options...
Onoff Posted September 4, 2017 Share Posted September 4, 2017 (edited) This one, same one: http://www.free-instruction-manuals.com/pdf/pa_1194760.pdf EDIT: I REALLY didn't follow those instructions! Edited September 4, 2017 by Onoff Link to comment Share on other sites More sharing options...
oranjeboom Posted September 4, 2017 Author Share Posted September 4, 2017 16 minutes ago, Onoff said: This one, same one: http://www.free-instruction-manuals.com/pdf/pa_1194760.pdf EDIT: I REALLY didn't follow those instructions! I was just going to follow your setup - only reason i read the instructions was because the boss asked me "do you know what you are doing?".... Link to comment Share on other sites More sharing options...
Nickfromwales Posted September 4, 2017 Share Posted September 4, 2017 If you read the words to the letter, it says 5. Assembly5.1. InstallationsGuidelinesIt is necessary during installation to follow the installation instructions, to comply with local requirements and to follow the codes of good practice. • Horizontal and vertical installation position possible "Codes of good practice" are the forces at work here. I'd say they're open to interpretation and the valve could be mounted and operate properly in the opposite orientation. It doesn't say that it won't work the other way, and it doesn't say it need to be mounted that way to comply with regs. I'd say it's a recommendation only to make service and repair most practical, and nowt else. . Link to comment Share on other sites More sharing options...
Onoff Posted September 5, 2017 Share Posted September 5, 2017 I reckon it's crud in mine. I really should isolate and clean it out. I was thinking the other day I need a stable pressure if I go for a UVC/TS later. (Another ship that's sailed! ) Link to comment Share on other sites More sharing options...
dpmiller Posted September 5, 2017 Share Posted September 5, 2017 I'd guess there's nore chance of crap falling down into the regulator portion in certain orientations. Link to comment Share on other sites More sharing options...
Nickfromwales Posted September 5, 2017 Share Posted September 5, 2017 2 hours ago, dpmiller said: I'd guess there's nore chance of crap falling down into the regulator portion in certain orientations. Not really as they're protected by a guaze filter. Link to comment Share on other sites More sharing options...
dpmiller Posted September 5, 2017 Share Posted September 5, 2017 that's on the inlet is it not? I'm pretty sure that anything loose in the post-reg plumbing could make it's way back into the reg under gravity. Link to comment Share on other sites More sharing options...
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