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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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De-sludging a CH system
Any suggestions for doing so please?
We will be replacing the aged back boiler in a couple of months. The chap that will do the job has suggested that desludging prior would be a good idea. I fully agree but don't know how best to do so. Conventional fully pumped system. Two motorised valves (CH & DHW), TRV's fitted to all but one rad. Two zones. Will probably replace all TRV's in the process as they are donkeys years old. System always has inhibitor, Fernox or Sentinel (can't remember), but hasn't been flushed for more than 20 years. I could go for a professional powerflush as I can't do it myself. Too many years & not enough diy time. I can drain the system completely and add chemicals. Then drain again, add more (other,if needed) chemicals and do this repeatedly. Given that I have at least a couple of months, this seems a good option as I would prefer to do it myself if at all possible. I realise that such drastic treatment will show up any potential weaknesses in the system (rusting rads etc), but now is the time for me to get it done. I hope this may not cause too many problems. I have been told that hydrochloric acid might be a good starter and also to be careful with it. I have a fair quantity of HCL as we use it regularly. I would not know what rate to administer this at. Alternatively Fernox DS-40 or similar. Any thoughts or recommendations would be very much welcomed. Time is not of the essence, but now is a good time to start. Best wishes to all for a very happy and preposterous new year. Nick. |
#2
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De-sludging a CH system
"Nick" wrote in message ... Any suggestions for doing so please? We will be replacing the aged back boiler in a couple of months. The chap that will do the job has suggested that desludging prior would be a good idea. I fully agree but don't know how best to do so. Conventional fully pumped system. Two motorised valves (CH & DHW), TRV's fitted to all but one rad. Two zones. Will probably replace all TRV's in the process as they are donkeys years old. System always has inhibitor, Fernox or Sentinel (can't remember), but hasn't been flushed for more than 20 years. I could go for a professional powerflush as I can't do it myself. Too many years & not enough diy time. I can drain the system completely and add chemicals. Then drain again, add more (other,if needed) chemicals and do this repeatedly. Given that I have at least a couple of months, this seems a good option as I would prefer to do it myself if at all possible. I realise that such drastic treatment will show up any potential weaknesses in the system (rusting rads etc), but now is the time for me to get it done. I hope this may not cause too many problems. I have been told that hydrochloric acid might be a good starter and also to be careful with it. I have a fair quantity of HCL as we use it regularly. I would not know what rate to administer this at. Alternatively Fernox DS-40 or similar. Any thoughts or recommendations would be very much welcomed. Time is not of the essence, but now is a good time to start. Best wishes to all for a very happy and preposterous new year. http://www.hss.com/g/51610/Central-Heating-Flusher.html HTH |
#3
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De-sludging a CH system
On Dec 30, 7:24*pm, "A Plumber" wrote:
"Vass" wrote in message ... "Nick" *wrote in ... Any suggestions for doing so please? We will be replacing the aged back boiler in a couple of months. The chap that will do the job has suggested that desludging prior would be a good idea. I fully agree but don't know how best to do so. Conventional fully pumped system. Two motorised valves (CH & DHW), TRV's fitted to all but one rad. Two zones. Will probably replace all TRV's in the process as they are donkeys years old. System always has inhibitor, Fernox or Sentinel (can't remember), but hasn't been flushed for more than 20 years. I could go for a professional powerflush as I can't do it myself. Too many years & not enough diy time. I can drain the system completely and add chemicals. Then drain again, add more (other,if needed) chemicals and do this repeatedly. Given that I have at least a couple of months, this seems a good option as I would prefer to do it myself if at all possible. I realise that such drastic treatment will show up any potential weaknesses in the system (rusting rads etc), but now is the time for me to get it done. I hope this may not cause too many problems. I have been told that hydrochloric acid might be a good starter and also to be careful with it. I have a fair quantity of HCL as we use it regularly. I would not know what rate to administer this at. Alternatively Fernox DS-40 or similar. Any thoughts or recommendations would be very much welcomed. Time is not of the essence, but now is a good time to start. Best wishes to all for a very happy and preposterous new year. http://www.hss.com/g/51610/Central-Heating-Flusher.html HTH Power flushing will certainly find the weak spots in the system, if your on meter they use a lot of water,personally if you've had fernox in I would drain down, take each rad off (can inspect) in turn, flush with hose pipe until water is clean, refit and refill and run heating for w hile then drain down again. then fill again with inhibitor when new boiler is fitted I certainly wouldn't put hydrocloric acid in, don't think it would do the system much good.- Hide quoted text - - Show quoted text - The above is right. Much better to drain down & remove the rads. Take them outside & give a good blast with the hose pipe. If you can remove the blanking plugs, so much the better. If they are more than say twenty years old I would consider replacing them if money is not an issue. Especially if there's been no inhibitor in the system. (It's supposed to be changed/boosted regularly) When you remove them be ready to catch the black gunge that runs out. If there is huge quantities of gunge, I would replace all of them & save future heartache. The black gunge being the remains of your radiators. I f possible give your system pipes a blastout with the hose pipe too. I refuse to believe these chemicals do as good a job. |
#4
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De-sludging a CH system
On Dec 30, 5:33*pm, "Nick" wrote:
Any suggestions for doing so please? We will be replacing the aged back boiler in a couple of months. The chap that will do the job has suggested that desludging prior would be a good idea. I fully agree but don't know how best to do so. Conventional fully pumped system. Two motorised valves (CH & DHW), TRV's fitted to all but one rad. Two zones. Will probably replace all TRV's in the process as they are donkeys years old. System always has inhibitor, Fernox or Sentinel (can't remember), but hasn't been flushed for more than 20 years. I could go for a professional powerflush as I can't do it myself. Too many years & not enough diy time. I can drain the system completely and add chemicals. Then drain again, add more (other,if needed) chemicals and do this repeatedly. Given that I have at least a couple of months, this seems a good option as I would prefer to do it myself if at all possible. I realise that such drastic treatment will show up any potential weaknesses in the system (rusting rads etc), but now is the time for me to get it done. I hope this may not cause too many problems. I have been told that hydrochloric acid might be a good starter and also to be careful with it. I have a fair quantity of HCL as we use it regularly. I would not know what rate to administer this at. Alternatively Fernox DS-40 or similar. Any thoughts or recommendations would be very much welcomed. Time is not of the essence, but now is a good time to start. Best wishes to all for a very happy and preposterous new year. Nick. Have a look at this: http://www.youtube.com/watch?v=pYURwv4Ci2A Protect the system afterwards with Sentinel X100 or Fernox MB-1/Fernox Protector F1. So are you not replacing the radiators? |
#5
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De-sludging a CH system
"VAG_dude" wrote in message
... On Dec 30, 5:33 pm, "Nick" wrote: Any suggestions for doing so please? We will be replacing the aged back boiler in a couple of months. The chap that will do the job has suggested that desludging prior would be a good idea. I fully agree but don't know how best to do so. Conventional fully pumped system. Two motorised valves (CH & DHW), TRV's fitted to all but one rad. Two zones. Will probably replace all TRV's in the process as they are donkeys years old. System always has inhibitor, Fernox or Sentinel (can't remember), but hasn't been flushed for more than 20 years. I could go for a professional powerflush as I can't do it myself. Too many years & not enough diy time. I can drain the system completely and add chemicals. Then drain again, add more (other,if needed) chemicals and do this repeatedly. Given that I have at least a couple of months, this seems a good option as I would prefer to do it myself if at all possible. I realise that such drastic treatment will show up any potential weaknesses in the system (rusting rads etc), but now is the time for me to get it done. I hope this may not cause too many problems. I have been told that hydrochloric acid might be a good starter and also to be careful with it. I have a fair quantity of HCL as we use it regularly. I would not know what rate to administer this at. Alternatively Fernox DS-40 or similar. Any thoughts or recommendations would be very much welcomed. Time is not of the essence, but now is a good time to start. Best wishes to all for a very happy and preposterous new year. Nick. Have a look at this: http://www.youtube.com/watch?v=pYURwv4Ci2A Protect the system afterwards with Sentinel X100 or Fernox MB-1/Fernox Protector F1. So are you not replacing the radiators? If the radiator have a "top bung" then if you remove that you can screw in a straight coupling (I used a shut off valve) that is then connected to a bit of pipe and then a hose pipe. No need to remove the radiator. |
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