Syphoning problem with column radiator on single pipe system

[Whyme]

a proper trv has the same bore as a standard valve so either or. The baffles usually just inject the flow further into the rad to stop the water short cutting..You have got the baffles in the flow side of the rad haven't ya ??

 

[E4gas]

That rad is big .

 

[happyflyer]

The new rad will have a known pressure drop across it for the correct flow to give the output, if the circulating pressure available on the single pipe system
will not give that, then it wont get hot, in an old cast iron rad the pressure drop would be low and most and I say most not all had TBOE this helped, having said all
that connection were normally 3/4"

BTW none of those elbows help your plight, in old single pipe systems some used tongue tees these had a scope in them helped to divert the flow from the main
into the branch, yours are not tongue I can see from the photos.

 

[happyflyer]

Well Canyondust we are all waiting with baited breath so we can learn from it all, did you get chance to do any mods on the pipework

 

[Canyondust]

Hi Happyflyer.

Thank you for your response.

I am unware of what the pressure drop across the radiator is or should be but I can say that the radiator is within 8 feet of the central heating pump and is the first radiator on the main pipe.

The original radiator was a pressed steel type without convectors - 15mm entry/exit ports. The inlet went directly into the base of the radiator (BL) via a 90 degree entry. The exit had a 90 degree flow regulator and directly to the single pipe system (the original single pipe T's have not been altered).

I am not quite sure how I can work around not have 90 degree junctions.

Would you be able to provide a link to a tongue T ? I dont think I have come across them.

I was contemplating producing a 90 degree, curved pipe (short) to fit inside the single pipe system as a kind of pick up tube to assit the flow - and possibly a similar idea on the exit.

Many thanks.

James.

 

[happyflyer]

The tongue tee had almost gone out of production when I was starting my apprenticeship 55 yrs ago, your idea of a scope elbow has been tried before many times, the problem is it
dependent on how fast the water is flowing in the SP main, your in a catch 22.

 

[Whyme]

Happyflyer is the tongue tee the same as an injector tee? like we used to have on back boilers with pumped heating gravity primary's shared return?

 

[happyflyer]

Happyflyer is the tongue tee the same as an injector tee? like we used to have on back boilers with pumped heating gravity primary's shared return?

No I will draw you one and post it, I tried to find one on tinternet some time back for someone else, but there isn't one..

 

[Best]

No I will draw you one and post it, I tried to find one on tinternet some time back for someone else, but there isn't one..

Happyflyer, is a tongue tee basically a swept tee?

 

[happyflyer]

No best I will draw you one today and post it, its a tee that has a bulged in it , if you look down inside it, it has a piece protruding into the water flow
and the is small hole in it, it basically diverts some water up into the tee, Canyon even if he could find one wouldn't be able to fit one getting it into the
steel pipe run would be easier to strip the whole think out and put new copper in.