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  Reply # 1120545 2-Sep-2014 15:23
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It doesn't go through a flashing or anything, so it'd be pretty simple. I managed to pull the pipe away from the wall to give it a quick paint, but if I really need to get it off in future I'll just cut it and either join or replace it.

What's a terminal vent? Is that a vent for the actual sewer pipe which is around 20cm away from it?




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  Reply # 1120623 2-Sep-2014 17:38
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timmmay: It doesn't go through a flashing or anything, so it'd be pretty simple. I managed to pull the pipe away from the wall to give it a quick paint, but if I really need to get it off in future I'll just cut it and either join or replace it.

What's a terminal vent? Is that a vent for the actual sewer pipe which is around 20cm away from it?



I learnt my plumbing from a builder father ( rather than professional plumber) so this is my interpretation.

The terminal vent is based on the assumption that (a) Bad vapours/gases rise like hot air and (b) like pouring a full can of beer on the ground, it gurgles unless there is a second hole to let air in
So

 

  • Your house connects to a sewer
  • so that vapours dont rise up your connection and come out of the sink, bath or toilet to poison you, there is a u-bend on each that holds water to stop this.
  • however as a safety, at the highest point away from your sewer connection you have a terminal vent, i.e. a pipe that rises to a higher point than your other connections so the vapours will vent there first.
  • I understand like the beer example, it also helps water/solids to flow.
From your picture it looks like the toilet has a connection to the terminal vent but as other have said, it is often dispensed with now

The bit i am unsure of is the old houses used to have a water trap at the point your house connection connected to the sewer or Buchan. this had air entry 
but I think  this has been done away with?
love to know if i am wrong anyone
FYI - my house has one that i keep clear in the garden



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  Reply # 1120634 2-Sep-2014 17:48
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Hi timmmay, can you take another pic showing the top of the vertical pipe?




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  Reply # 1120678 2-Sep-2014 18:12
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Thanks D. DK I can take a photo tomorrrow as it's dark, but it's just a 100mm pipe with a little cap on top to stop birds nesting in it. It goes to just above roof level, maybe 3 meters high.




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  Reply # 1120908 3-Sep-2014 00:19
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D1023319:
timmmay: It doesn't go through a flashing or anything, so it'd be pretty simple. I managed to pull the pipe away from the wall to give it a quick paint, but if I really need to get it off in future I'll just cut it and either join or replace it.

What's a terminal vent? Is that a vent for the actual sewer pipe which is around 20cm away from it?



I learnt my plumbing from a builder father ( rather than professional plumber) so this is my interpretation.

The terminal vent is based on the assumption that (a) Bad vapours/gases rise like hot air and (b) like pouring a full can of beer on the ground, it gurgles unless there is a second hole to let air in
So

 

  • Your house connects to a sewer
  • so that vapours dont rise up your connection and come out of the sink, bath or toilet to poison you, there is a u-bend on each that holds water to stop this.
  • however as a safety, at the highest point away from your sewer connection you have a terminal vent, i.e. a pipe that rises to a higher point than your other connections so the vapours will vent there first.
  • I understand like the beer example, it also helps water/solids to flow.
From your picture it looks like the toilet has a connection to the terminal vent but as other have said, it is often dispensed with now

The bit i am unsure of is the old houses used to have a water trap at the point your house connection connected to the sewer or Buchan. this had air entry 
but I think  this has been done away with?
love to know if i am wrong anyone
FYI - my house has one that i keep clear in the garden




First of all that pipe joining into the side is most likely just a waste pipe from another fixture. Probably a basin. As for whether it is a "terminal vent" This only depends on what it's purpose is. Only venting just that toilet or fixture. Or Venting the entire drainage system on the property. You only need to worry about things like that if you are designing a new drainage system. Or modifying an existing one. But timmmay only wants to remove then reinstate it to how it was before.

And yes the U bends underneath fixtures are to keep drain gasses out of your house. But the vent pipes are only there to keep the air pressure inside the drains the same as what is in your house. To stop the water seals either getting sucked down the pipes. Or smelly sewer gasses getting pushed into your house.





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