ToughButterCup Posted March 4, 2020 Share Posted March 4, 2020 Come on then.... what's the half degree for? Come to that, what's two and a half degrees for? Tell me that plumbers ? Dare ya. Link to comment Share on other sites More sharing options...
Jeremy Harris Posted March 4, 2020 Share Posted March 4, 2020 It's to allow for a 2.5° fall on the roughly horizontal bit of pipe. 2 Link to comment Share on other sites More sharing options...
ToughButterCup Posted March 4, 2020 Author Share Posted March 4, 2020 ? Link to comment Share on other sites More sharing options...
Temp Posted March 4, 2020 Share Posted March 4, 2020 The EU have 100 degrees in a right angle so you get these odd half degree amounts when you do the conversion to "imperial degrees". 3 Link to comment Share on other sites More sharing options...
ToughButterCup Posted March 4, 2020 Author Share Posted March 4, 2020 Quatschkopf ! Link to comment Share on other sites More sharing options...
Temp Posted March 4, 2020 Share Posted March 4, 2020 11 minutes ago, AnonymousBosch said: Quatschkopf ! Didn't know you spoke German. Link to comment Share on other sites More sharing options...
ToughButterCup Posted March 4, 2020 Author Share Posted March 4, 2020 Echt? Didn't know you were a plumber. Link to comment Share on other sites More sharing options...
ToughButterCup Posted March 5, 2020 Author Share Posted March 5, 2020 Moving swiftly on , an 87.5 degree bend is 87.5 because....? Link to comment Share on other sites More sharing options...
dpmiller Posted March 5, 2020 Share Posted March 5, 2020 it's the opposite angle- they add up to 180... Link to comment Share on other sites More sharing options...
ToughButterCup Posted March 5, 2020 Author Share Posted March 5, 2020 I'm no good at this am I? I just don't see it (yet). I'll get there. Link to comment Share on other sites More sharing options...
joe90 Posted March 5, 2020 Share Posted March 5, 2020 8 minutes ago, AnonymousBosch said: I'm no good at this am I? I just don't see it (yet). I'll get there. that’s why we are all here, to learn. Link to comment Share on other sites More sharing options...
Temp Posted March 5, 2020 Share Posted March 5, 2020 (edited) 6 hours ago, dpmiller said: it's the opposite angle- they add up to 180... I couldn't immediately think where you would do that? I mean if you have a pipe run that descends vertically, then goes horizontally (with a fall), then descends vertically again you need two 92.5 degree bends not one of each. Perhaps if you were going around three sides of a building? Edited March 5, 2020 by Temp 1 Link to comment Share on other sites More sharing options...
ToughButterCup Posted March 9, 2020 Author Share Posted March 9, 2020 On 05/03/2020 at 16:07, Temp said: [...] if you have a pipe run that descends vertically, then goes horizontally (with a fall), then descends vertically again you need two 92.5 degree bends not one of each. [...] Thanks @Temp Caught a naiscent error for me ... I'm try to plumb this bit of soil pipe from upstairs, through the wall down through the wet room and thence outside (follow the blue line) The top bend is 92.5 (just below the POSI - although the angle is not drawn to scale) and once the pipe is through the concrete from the office into the Wet Room, the next bend will be a 92.5. The next two are also 92.5s. Double sockets I think. So you stopped me making three errors. Thanks. I thought the next bend after a 92.5 should automatically be an 87.5 (following the logic pointed out by @dpmiller). Its my inability to see what a packed lunch needs to do on its way from the loo to the digester..... not @dpmiller's explanation of the obvious once its been pointed out. Ian Link to comment Share on other sites More sharing options...
BotusBuild Posted March 9, 2020 Share Posted March 9, 2020 (edited) Erm, if you have a 92.5 degree (more than a right angle) bend at the top "stuff" will surely collect in a small pool. Wouldn't you want all those bends in the marvellous drawing to be around 45 degrees each? Edit: Doh!! Put's on dunces cap and shuffles into the corner ? Edited March 10, 2020 by BotusBuild Link to comment Share on other sites More sharing options...
Mr Punter Posted March 9, 2020 Share Posted March 9, 2020 Unless this a joke and I don't "get" it, 92.5 and 87.5 degree bends are the same - they are slightly less than a right angle. One measurement is the bend itself, the other is between the original direction and the new one. Just like a 45 degree is the same as a 135 degree. Link to comment Share on other sites More sharing options...
ToughButterCup Posted March 9, 2020 Author Share Posted March 9, 2020 Hmmmm, got me worried for a minute, but have a look at this .... The blue line is the line of flow. The office and wetroom walls are parallel, so each pair of angles on each wall must add up to 180 Unless I'm missing something, and that wouldn't be the first time either..... Instinctively I thought 45s would do the job . It was only this morning that I tried to make the damn thing work - and found that a 45 degree bend , wouldn't lead the pipe through the hole I had cut in the concrete.... the hole was too 'square' to the floor. In this case 2 lots of 92.5 double sockets should do the job(bie) . But if I get a rush of blood to the head, then with a load more concrete hammering , 45s will do just as well. Link to comment Share on other sites More sharing options...
joe90 Posted March 9, 2020 Share Posted March 9, 2020 Personally I would use two 45’ bends if it’s possible to get them in, if not 90’ (ish!) ones will do but maybe more prone to blockages ? 1 Link to comment Share on other sites More sharing options...
ToughButterCup Posted March 9, 2020 Author Share Posted March 9, 2020 The waste only has about 300mm to travel at 2.5 degrees ..... but that would tend to be noisier than a couple of 45s wouldn't it? And knowing my luck if it has a tendency to block more easily, it will. Merde, Scheisse, Poo, Merda.? 'Nother steep shitty learning curve innit? Bugger. Thanks @joe90 : its obvious, you are right. Coffe and then the SDS. Damn! Cant take a joke? Don't start a self-build. 1 Link to comment Share on other sites More sharing options...
Jeremy Harris Posted March 9, 2020 Share Posted March 9, 2020 You might get away with it, after all, a soil stack usually has a swept 92.5° bend at the base. If you can fit a swept bend in at the bottom of the top vertical bit, then the second 92.5° bend turning that back down to the vertical isn't a problem. Blockages occur when the velocity slows right down, and although bends do slow things a lot, the vertical bit will mean that the velocity at the bend will be pretty high to start with. I've only ever seen bends cause a serious flow problem when they are near-horizontal, not when they are vertical, TBH. Link to comment Share on other sites More sharing options...
ToughButterCup Posted March 10, 2020 Author Share Posted March 10, 2020 Well @joe90, here's what I did last night.... making the hole slope at 45 degrees took much longer than I thought it would While I agree with @Jeremy Harris point that in terms of flow, I might have got away with two 92.5 degree bends, might have isn't good enough. And when I considered the noise aspect - the prospect of living for ever more with a noisy loo flush all because I couldn't be bothered to make a bit more effort ... Whats the point of doing it on your own and cutting corners? Exerience shows me I can pay other people and have corners cut aplenty. Harsh way of find out what 92.5 degree bends are for innit? ? 1 1 Link to comment Share on other sites More sharing options...
BotusBuild Posted March 10, 2020 Share Posted March 10, 2020 (edited) 19 hours ago, Mr Punter said: Unless this a joke and I don't "get" it, 92.5 and 87.5 degree bends are the same - they are slightly less than a right angle. One measurement is the bend itself, the other is between the original direction and the new one. Just like a 45 degree is the same as a 135 degree. Got my 87.5 (less than 90) and 92.5 (more than 90) the wrong way round. I am wearing the dunces cap for the day But I see that my suggestion of using 45 degree bend has been adopted ? Edited March 10, 2020 by BotusBuild Link to comment Share on other sites More sharing options...
ToughButterCup Posted March 10, 2020 Author Share Posted March 10, 2020 1 hour ago, BotusBuild said: [...] But I see that my suggestion of using 45 degree bend has been adopted ? For which I am very grateful indeed. 1 Link to comment Share on other sites More sharing options...
Construction Channel Posted March 11, 2020 Share Posted March 11, 2020 On 09/03/2020 at 14:02, AnonymousBosch said: walls are parallel, so each pair of angles on each wall must add up to 180 I'm a bit late to this party. But this sounds similar to the missing pound riddle. You don't want to get to 180. Else you would be going straight back up, (in that case you would want the 87 bend) You want to get back to 0. Hence a 92 and a - 92 being what you want. Link to comment Share on other sites More sharing options...
Oz07 Posted March 12, 2020 Share Posted March 12, 2020 We are all aware you can link the pipe in the fitting probably 5 degrees each way! I've never heard a plumber say go get me a 87.5, it's an elbow! Link to comment Share on other sites More sharing options...
ToughButterCup Posted March 13, 2020 Author Share Posted March 13, 2020 On 12/03/2020 at 06:53, Oz07 said: We are all aware you can link the pipe in the fitting probably 5 degrees each way! ...! Thanks for that. I didn't know that the tolerance was quite so great. I spent an hour yesterday chipping out concrete all for a couple of degrees misalignment. Bloody German heritage....it's a curse sometimes Link to comment Share on other sites More sharing options...
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