Vinn. Firstly, I work for a Water Company, and I deal with sewerage on a daily basis. I am also trained in the use of high pressure water jetting and Confined Space access, so I do feel that I have an idea of what I'm talking about. You have told Newboy he is wrong on 2 counts and now I am wrong on 3, so obviously I, and my colleagues have been getting it wrong for the last 25 years... I fail to see where Newboy attempted to correct you, his posts are factual and are relevant to this thread.
I merely pointed out the use of the rodding eye, as you have wrongly stated "There should be another manhole at the point where your house sewer joins the common sewer at the bottom of your garden". Frequently 'blind connections' were made from the house drainage system to the main sewer, the whole purpose of the rodding eye is to allow rodding/jetting access beyond the interceptor. Regs require all parts of the system to be accessible for rodding should the need arise, there are various methods of providing that access, otherwise there would be a chamber at every house connection in some streets!
The term surcharging or surcharged, is used by drainage engineers to describe a sewer that is running at or above full capacity. With drains of that era often being on a combined system, during times of heavy rainfall surcharging can and does occur, which is often why the clay stoppers are missing from interceptor rodding eyes. They have been dislodged in the past, usually falling into the bottom of the trap, thus causing a blockage. Secondly, the use of high pressure water jetting to clean sewers can also result in the dislodging of such a stopper, hence why I feel it unwise to fit a replacement bung in that rodding eye.
Furthermore, you are encouraging people to enter chambers in order to fit a bung. Whilst it appears the OP's chamber in the supplied picture is not very deep, there are chambers considerably deeper out there. Someone else reading this may get the idea to go and fit a bung in their chamber. I will ask, what is your knowledge of H2S (Hydrogen Sulphide) and other gases relevant to the industry?
I merely pointed out the use of the rodding eye, as you have wrongly stated "There should be another manhole at the point where your house sewer joins the common sewer at the bottom of your garden". Frequently 'blind connections' were made from the house drainage system to the main sewer, the whole purpose of the rodding eye is to allow rodding/jetting access beyond the interceptor. Regs require all parts of the system to be accessible for rodding should the need arise, there are various methods of providing that access, otherwise there would be a chamber at every house connection in some streets!
The term surcharging or surcharged, is used by drainage engineers to describe a sewer that is running at or above full capacity. With drains of that era often being on a combined system, during times of heavy rainfall surcharging can and does occur, which is often why the clay stoppers are missing from interceptor rodding eyes. They have been dislodged in the past, usually falling into the bottom of the trap, thus causing a blockage. Secondly, the use of high pressure water jetting to clean sewers can also result in the dislodging of such a stopper, hence why I feel it unwise to fit a replacement bung in that rodding eye.
Furthermore, you are encouraging people to enter chambers in order to fit a bung. Whilst it appears the OP's chamber in the supplied picture is not very deep, there are chambers considerably deeper out there. Someone else reading this may get the idea to go and fit a bung in their chamber. I will ask, what is your knowledge of H2S (Hydrogen Sulphide) and other gases relevant to the industry?
