WWilts Posted November 6, 2020 Share Posted November 6, 2020 Planned manhole is about 1.6m below existing manhole (on raised patio). Distance about 30m, 20m of which is garden. Anyone faced this challenge? What solution(s) would you consider? Link to comment Share on other sites More sharing options...
Dave Jones Posted November 6, 2020 Share Posted November 6, 2020 no drama. You need a pumped chamber, big barrel with a pump in it that works of a float (not floaters). They are not that expensive, oversize it. https://www.plasticdrainage.co.uk/underground-drainage/septic-tanks-and-sewage-treatment-plants/pump-chambers 2 Link to comment Share on other sites More sharing options...
PeterW Posted November 6, 2020 Share Posted November 6, 2020 Are you measuring lids or invert levels ..?? How deep is the existing manhole ..? Is the existing manhole the connection to the main sewer ..? Link to comment Share on other sites More sharing options...
WWilts Posted November 7, 2020 Author Share Posted November 7, 2020 16 hours ago, PeterW said: Are you measuring lids or invert levels ..?? How deep is the existing manhole ..? Is the existing manhole the connection to the main sewer ..? Lids (ground levels). Yes, invert of existing might well be far lower. Existing has drain connecting to mains sewer. Link to comment Share on other sites More sharing options...
PeterW Posted November 7, 2020 Share Posted November 7, 2020 Need to understand the inverts and also where the main run is as your sewage provider may not allow you to connect to an existing lateral drain. Link to comment Share on other sites More sharing options...
WWilts Posted November 8, 2020 Author Share Posted November 8, 2020 Mains sewer manhole on road approx 50m distant from likely pump location of new build. Receives 4" drain from single property (our house). Our house has manhole approx 30m distant from likely pump location. Link to comment Share on other sites More sharing options...
Dave Jones Posted November 9, 2020 Share Posted November 9, 2020 Just workout the head (how much higher the mains manhole pipe is from your pump in the bottom of the pumped chamber. Even the dirt cheap ones can cope with10m of head with little problem. 1 Link to comment Share on other sites More sharing options...
PeterW Posted November 9, 2020 Share Posted November 9, 2020 Sewage pumps are somewhere where cheap isn’t best, and you need to size them correctly to allow for power outages, blocked pumps etc. Twin rail pumps in large tanks, failure alarms, all sorts of considerations are needed before you go this way. The main consideration should be “do you need one”. You need to have a proper invert survey done, and get the invert levels of the sewer and any intermediate ICs/Manholes between your start point which you can assume as 600mm below target finished floor level, and the road. A 1:80 drop will mean you need to have a road invert of more than 1.25m, assuming there is a flat site. This would allow a standard connection which is much more preferable than a pump. Also bear in mind you cannot pump into a mains sewer so any connection would need an intermediate chamber and a road connection or if the sewage provider allows it, connection into the current house system. This is also a building regulations requirement and is one of the first things they usually ask for, the drainage plan. 1 Link to comment Share on other sites More sharing options...
Mr Punter Posted November 9, 2020 Share Posted November 9, 2020 I have installed a pump station in the past. Although you can go for very expensive pumps, 2 pump systems, rail mount etc I think it is sometimes more practical to just have a fairly inexpensive single pump with chain plus a spare stored in the house. Don't bother with servicing. If the pump fails, swap it out. 2 Link to comment Share on other sites More sharing options...
WWilts Posted November 9, 2020 Author Share Posted November 9, 2020 Many thanks, excellent pointers Link to comment Share on other sites More sharing options...
Mr Punter Posted November 9, 2020 Share Posted November 9, 2020 Also bear in mind that when these fail the tank full of sewage is not all that bad. Maybe I have poor sense of smell but lots of it will be water from showers, dishwasher, laundry. Obvs a fair mix of floaters but the contents are regularly pumped away. 2 Link to comment Share on other sites More sharing options...
TonyT Posted November 10, 2020 Share Posted November 10, 2020 Have a look at Kingspan, yes the insulation people! They supply and install small pumping chambers in lots of different configurations, single pump, dual pumps, float on/off/high level warning etc. 1 Link to comment Share on other sites More sharing options...
WWilts Posted November 12, 2020 Author Share Posted November 12, 2020 On 09/11/2020 at 12:36, Mr Punter said: Also bear in mind that when these fail the tank full of sewage is not all that bad. Maybe I have poor sense of smell but lots of it will be water from showers, dishwasher, laundry. Obvs a fair mix of floaters but the contents are regularly pumped away. On 10/11/2020 at 16:10, TonyT said: Have a look at Kingspan, yes the insulation people! They supply and install small pumping chambers in lots of different configurations, single pump, dual pumps, float on/off/high level warning etc. Thanks! Link to comment Share on other sites More sharing options...
WWilts Posted July 13, 2021 Author Share Posted July 13, 2021 On 09/11/2020 at 09:01, Mr Punter said: Although you can go for very expensive pumps, 2 pump systems, rail mount etc I think it is sometimes more practical to just have a fairly inexpensive single pump with chain plus a spare stored in the house. Don't bother with servicing. If the pump fails, swap it out. Is it reasonably easy and quick to swap out a pump? Link to comment Share on other sites More sharing options...
Mr Punter Posted July 13, 2021 Share Posted July 13, 2021 27 minutes ago, WWilts said: Is it reasonably easy and quick to swap out a pump? If the chamber is outside it is a matter disconnect mains, open the lid, pull out the pump, which will be attached to a chain or rail, disconnect waste pipe and cable, connect pipe to new pump and cable to mains, drop it back in and switch on mains again. You may like to take a shower after, or at least give your hands a quick rinse, before you go out to dinner with that nubile secretary from accounts. 1 Link to comment Share on other sites More sharing options...
AndrewFitton Posted September 11, 2021 Share Posted September 11, 2021 (edited) We’ve a klargester tank with a very good pump. We get it serviced annually as frankly poking around a 6ft tank of your own and others faeces or replacing a good pump which can be way over £500 when it costs 140 for the peace of mind of an annual service is no contest as far as I’m concerned. We’ve had one problem with it when my daughter conspired to wash pounds of dough down the sink two christmas ago which stuck to the float and the tank, tripped the fuse and brimmed - that was pretty horrible and completely avoidable if people did as they were asked and didn’t force literally handfuls of sticky dough repeatedly down the sink. It also highlights you really don’t want to be doing any repair on it unless you are mad as a box of frogs. Other than that it has been un-noticed and a picture of efficiency. Edited September 11, 2021 by AndrewFitton Link to comment Share on other sites More sharing options...
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