# Technical Pressure Question

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#### muggles

Absolute drivel

So come on then, if that's drivel, what's the explanation according to Namsag??

#### doitall

Did you know you could improve circulation by raising the pressure in the system

C

#### cantaloup63

Did you know you could improve circulation by raising the pressure in the system
So why stop at 1 to 2 bar?

#### Dan Robinson

Safety, production cost, practicality, user incompetence, disperate origins of parts....the list is endless.

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#### cantaloup63

Safety, production cost, practicality, user incompetence, disperate origins of parts....the list is endless.
I note that you curiously omitted "installer incompetence" - or is that within the "endless list"

#### Dan Robinson

See "disperate" & "origins" .

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#### rebuilder

The original question was...."So why do so many recommend that a closed system be pressurised up to 1 to 1.5 bar cold?"

To my knowledge 1 bar is one atmosphere, which is the weight of the air at sea level. If the sealed pipes are 1 bar then the pressure inside is the same as at sea level?

If the pressure gauge is downstairs and set to 1 bar with the house having three floors which is maybe approximately 30 foot in height (which is 1 bar in pressure) to the highest system point will the pressure at the top be less than at the bottom in a sealed system? By 1 bar? Gravity comes into play even in a sealed piped system. Gravity is always there. If it is 1 bar at ground level then it stands that it must be 0 bar 30 foot above it. Is that so?

In a normal 2 floor house, and most 3 floor house I would assume, 1 bar will get you up to the highest level with no problems. I suspect this is why they stipulate the system being set to 1 bar cold.

I am open to correction as I am going by what I learnt in school and applying to this question.

#### Dan Robinson

Yes but we are talking about pressureabove atmospheric.

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#### cantaloup63

Yes but we are talking about pressureabove atmospheric.
But it's all relative 1 bar above local atmospheric would presumably be 2 bar if local atmospheric was 0 bar and you then decided to move the whole thing 30' down to the beach.

Maybe that's what it's all about - aeroplanes and spacecraft. So installing a pressurised heating system on a plane would involve significant pressure changes depending where in relation to sea level it currently is.

So you see, it is rocket science after all

#### doitall

I'm 600ft above sea level, what should my gauge read.

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#### cantaloup63

I'm 600ft above sea level, what should my gauge read.
minus 20 bar, silly

#### Nige F

[quote="cantaloup63";p="2257862Maybe that's what it's all about - aeroplanes and spacecraft. :[/quote] Don`t forget the conveyor

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#### rebuilder

Yes but we are talking about pressureabove atmospheric.

Interesting. So are you saying a gauge reading 1 bar at ground level is really 2 bar? The pressure in the system plus atmospheric which is 1 bar?

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