Is there a maximum 15 mm pipe length from the 22 mm ring?

llChopperll · 29 Jan 2017

Hi,

I'm wanting to add 2*1783 watt (6084 BTU) radiators to my existing central heating system. Assuming that the boiler is large enough to accommodate the addition is there a maximum length of 15 mm pipe that can be run from the 22mm ring?

I am planning two individual flow and returns as I doubt that two radiators of this size would work properly off one (correct me if I'm wrong).
The 22 mm ring is on the first floor and the two 15mm flow and return running to the radiators on the ground floor (approximately 9m horizontal and 2.4 vertical for each flow and each return).
Would there be enough pressure in the system or would I have to extend the 22 mm ring?

Thanks for any constructive input

IIChopperII

stem · 29 Jan 2017

If you have a 22mm pipe run as a "ring" then this is what is known as a 'one pipe system' and the ring should be extended so that it runs underneath the radiators, so that they sit atop it like this.

The 'T' going directly up from the ring to the radiator will be in 15mm, but it will be very short.

muggles · 29 Jan 2017

You've not given us any information about the spec of your central heating pump so I'm afraid it's a little difficult to advise whether it's capable of pumping that far or not

Agile · 29 Jan 2017

Quite apart from telling us if it is a condensing boiler or not!

Apparently some heating aspects are not quite so simple!

Tony

45yearsagasman · 29 Jan 2017

Tell us more about your system and its age.

slippyr4 · 29 Jan 2017

If he has a one pipe system, it shouldn't be extended, it should be replaced!!!

Agile · 29 Jan 2017

I don't see any evidence of it being likely to be a one pipe!

slippyr4 · 29 Jan 2017

Me either but it's what stem said,above. Horrible things.

stem · 29 Jan 2017

Agile said:
I don't see any evidence of it being likely to be a one pipe!

It's quite simple the OP described it as:

llChopperll said:
the 22mm ring

A one pipe system is a 'ring' of pipe that flows from the boiler and back to it in a loop as per the diagram I posted. Other systems have separate pipes for flow and return, they are not configured as a ring.

It maybe that the OP has used the wrong terminology, but his post does state that it is a ring.

Agile · 29 Jan 2017

And he has twice mentioned a flow and return!

Unlikely he is using the correct terms but my bets would be a conventional system!

BigSnoopy01 · 29 Jan 2017

one pipes are fine on modern boilers although not ideal. no need to rip the lot out. more important to get the right vavles and balance system.

stem · 30 Jan 2017

Agile said:
And he has twice mentioned a flow and return! Unlikely he is using the correct terms but my bets would be a conventional system!

The OP's question is "Is there a maximum 15 mm pipe length from the 22 mm ring?"

He does mention flow and returns, but the post states that he wants to add the "flow and returns" to the "ring". He doesn't say that they are there already. Maybe he has used the wrong term, but 'ring' is hardly a technical word, the OP's question is "Is there a maximum 15 mm pipe length from the 22 mm ring?" Perhaps the OP will confirm what he has, then we can all stop guessing.

llChopperll · 30 Jan 2017

Thanks for the reply's and sorry for the wrong use of terminology.

The system is a conventional one with a 22mm flow and return with the 15mm flow and returns 'T'd off this. I've attached a diagram of current and proposed set up.
I think the boiler is a Feroli domicompact F30 B (making it a condensing boiler Agile), and a 30kw output.
muggles I'm unsure of the pump spec, but have attached what I think is a relevant page from the manual.
FYI There is a 12ltr external expansion tank in the set up.

Radiator Extension.pdf
3540B282.pdf

Hope this clears up any ambiguity

IIChopperII

Agile · 30 Jan 2017

The usual rule of thumb for non condensing boilers was that you could take about 3 kW from 15 mm pipes up to about 3-4 m from the 22 mm.

With a condensing boiler set to a differential of nearly 20C then you could almost double the distance or power.

Tony

Steelmasons · 30 Jan 2017

Agile said:
The usual rule of thumb for non condensing boilers was that you could take about 3 kW from 15 mm pipes up to about 3-4 m from the 22 mm.

With a condensing boiler set to a differential of nearly 20C then you could almost double the distance or power.

Tony

15mm tube will carry a 6kw load @ 10c dt. (0.14 x 4.2 x 10c = 5.8 kW)
15 mm tube @ 20 dt (0.14 x 4.2 x 20c = 11.6 kW)
Tony , had you of recieved the correct training then you wouldn't be making these school boy errors.

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Is there a maximum 15 mm pipe length from the 22 mm ring?

llChopperll

stem

muggles

Agile

45yearsagasman

slippyr4

Agile

slippyr4

stem

Agile

BigSnoopy01

stem

llChopperll

Attachments

Agile

Steelmasons

DIYnot Local

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