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Post by rocketmanbkk on Apr 15, 2019 18:02:18 GMT
Hello
I don’t do much unvented work but might have a job.
The combination valve - states the main cold needs to be on 22mm but it exits after the stopcock in 15mm.
I can obviously increase this to 22mm but will this be ok? Should I increase the pipe size as soon after the stopcock as I can or is nearer to the combi valve also acceptable?
Cheers all
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Post by cylinderfella on Apr 15, 2019 18:37:35 GMT
Here's a vid. You can watch it with the sound down it's less annoying!! Suppose either would be fine once it's 22 after valve.
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Post by tomplum on Apr 15, 2019 18:55:38 GMT
You'll see loads of these with just 15mm to the valve if they've been done by a DIY man or even by plumbers if the original cylinder was vented because, in the days before unvented a 15mm water main was all we ever installed in new house builds, To upgrade it is an expensive job because, The 22mm water main must go direct to the cylinder with only the kitchen sink being tee'd off, then all the appliances fed from after the combi valve, So make it clear to the customer to do the job right will be expensive doing the cheaper way will invalidate the warrantee of the cylinder and valve, So the bullshit over, It will still work ok from 15mm.  |
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Post by rocketmanbkk on Apr 15, 2019 19:09:19 GMT
You'll see loads of these with just 15mm to the valve if they've been done by a DIY man or even by plumbers if the original cylinder was vented because, in the days before unvented a 15mm water main was all we ever installed in new house builds, To upgrade it is an expensive job because, The 22mm water main must go direct to the cylinder with only the kitchen sink being tee'd off, then all the appliances fed from after the combi valve, So make it clear to the customer to do the job right will be expensive doing the cheaper way will invalidate the warrantee of the cylinder and valve, So the bullshit over, It will still work ok from 15mm. Cheers. I’ve told them exactly that, I’ve told them it needs doing properly & doing once. They’re nice people & it’s a decent house. Cheers all |
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Post by Deleted on Apr 15, 2019 19:22:45 GMT
My unvented ticket runs out next month, more money for a worthless card.  |
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Post by rocketmanbkk on Apr 15, 2019 19:27:53 GMT
My unvented ticket runs out next month, more money for a worthless card. More money out PB! I went out on Saturday with an old chum who moved away, we went to see Alexander O’Neal, anyway he’s good at doing stuff & did his bungalow up, full refurb with loft conversion, he did a great job, all self taught including plastering, anyway he did a couple of unvented installs for a cafe, I told him about getting a ticket & he thought I was joking! |
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Post by Deleted on Apr 15, 2019 19:34:28 GMT
Love it !!! |
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Post by crowsfoot on Apr 16, 2019 6:14:18 GMT
The firm that I work for maintains a lot of these units/systems for the local government and all of them have 15mm incoming mains Rocky.
The increase in size from 15mm is normally near the unvented cylinder, even in the same cupboard.
You do need a good mains pressure though, if it's under 2 bar fit something else is the advice given.
That pressure reducing valve is to protect the cylinder because the mains pressure can fluctuate and in the night it can reach 5 or 6 bar of pressure which you don't want to subject the unvented cylinder too.
I've only seen the pipework on the cold mains in new properties controlled by a pressure reducing valve; it's mainly left as it is on older properties, unprotected, because the rising main can take these large fluctuations of mains pressure whilst the cylinder can't.
Tappy,
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Post by crowsfoot on Apr 16, 2019 6:25:48 GMT
I watched the video after posting so sorry for repeating what that that plumber parts guy tells us. My unvented ticket expires in 2022 which is also when I reach retirement age so I guess that will then be it for me and unvented cylinder work. I've just noticed that it's called the "European Registration Scheme for Personnel Competence" so after brexit will it be still valid? I might after do another one yet!!  |
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Post by DIYDafty on Apr 16, 2019 15:56:52 GMT
Can you get unvented without being gassafe first ?
If so do you basically need to be a plumber to get it due to a requirement of practical evidence? How much is it?
I wish there was something inbetween a fat nothing and full on commercial GasSafe/unvented that just allowed the home owner to do his own work. I've said before whilst I think all this is definitely not for idiots it is no more dangerous than messing around with electrics or even crossing the road.
Maybe an afternoon's course on the theory just to get the privilege to work on your own stuff. (Note definitely 100% NOT saying all the stuff that needs to be learned could be done in an afternoon but the main safety stuff could be rammed home e.g. gas tightness test and CO venting AND I'm also pretty sure those straight from a 5 day gassafe course who've paid thousands would still be nowhere near as competent as a time served plumber.
Sadly the wind of nanny state has been blowing the other way for years and soon we'll need a ticket just to buy copper pipe.
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Post by crowsfoot on Apr 16, 2019 19:48:56 GMT
You can certainly be unvented without being gas safe DD (I am for one).
I would think that you would need a plumbing qualification though to take the unvented exam.
It's just a one day test really, the morning will be taken up by the instructor chatting to you telling you a few of his stories and exchanging a bit of banter plus telling you answers to the questions that you're most likely to slip up on.
In the afternoon we paired up to answer an open book exam during which the instructor will ask you if everything's all right several times and put you on the right lines if you are struggling with anything.
The gas safe exam was once like this, but it's now more intense, I know this because there was a miserable guy in another room retaking it and his examiner came in our room saying "he's got more questions wrong the second time than he had the first time - I don't know what to do with him" ?
NB There is something in the air from the gods above right now which is about proving competence and it's not a card with a picture on it of the person who is said to be competent on it , so who knows? Maybe these type of tests days are numbered, everything changes in time.
I have a little bit more info on this somewhere so I'll post it up when I find it.
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Post by Deleted on Apr 16, 2019 20:09:25 GMT
I don't think I'll bother renewing my unvented to be honest, sick to death of plumbing the industry is going to shit !!!
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Post by tomplum on Apr 16, 2019 20:31:01 GMT
I never renewed mine, I did mine once and no one ever asked for it so i said fuck um, bunch o pen pushing,deskjockys, they do fuck all for thier money, gassafe is bad enough but i had to pay them to register boiler installs, |
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Post by crowsfoot on Apr 17, 2019 6:25:16 GMT
My gas safe days ended around 20 years ago in an argument with the gaffer who said that he wouldn't pay any extra money for employees who only spend 20% their time doing gas work - I told him what to do with his gas safe assessment!!  Glad I'm out of it these days, boilers where fast moving on in their technology even at that time and leaving the old design (thermostat, thermo couple, burner) of gas boiler behind which had been a constant for almost 40 years. I don't get paid anymore for being unvented certified either (no matter what % time I spend on it), I guess that's different though! |
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Post by dickpuller on Apr 17, 2019 20:14:16 GMT
My unvented ticket runs out next month, more money for a worthless card. My G3 lasts a lifetime here in Jockoland PB!! I did it that long ago I can’t even remember!! It’s on my ACS card from Gas Safe👍👍 Fucking Jocks get everything mate😄😄😄 I’ve even got a Gift Card for the local Pop-Up Brothel!! |
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