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[feeutfo]

had the plumber round today, with a thermal imaging camera, inconclusive. hot spots present on all the joins, but the join that was repaired had no lagging, and the signature is the same on the repaired joint when compared to all the existing ones.

Our heating pipes are under the concrete floor as you may have seen elsewhere on here, and we still seem to have a leak. We're loosing about 0.3bar a day on the heating system. although the system was opened and drained down completely, so it could just be settling in. it did seem to settle at 0,8 bar over the last couple of day, except the las time i checked the heating was on flat out.

so question is, how much would the heating in the system increase the pressure from cold?

we have a press pack on the central heating, instead of a stop cock and tank, this allows us to measure the mains fead pressure in the central heating, and see if the pressure drops in the system, indicating a leak. i'm also trying to allow for expansion as the heating chimes in, but there doesnt seem to be any. should there be? and if so how much?

we'll continue to monitor the pressure daily. i've almost worn the loft ladder out

[redelitev6]

Might be worth checking the pressure relief valve , they can sometimes weep if a speck of dirt gets trapped in the sealing faces

[feeutfo]

Might be worth checking the pressure relief valve , they can sometimes weep if a speck of dirt gets trapped in the sealing faces

yes the plumber was hoping/praying that might be the case, sadly not that lucky, over flow is dry as a bone.

[Shackeng]

This any use Chris: http://inspectapedia.com/plumbing/Hot_Water_Expansion.htm

[Kevin Wood]

Depends how large the system is relative to the size of the pressure vessel really.

Try it. Fill it to 1 bar stone cold, then fire up the heating to maximum temperature with all radiators on. Once the boiler has cut out, check the pressure rise. I'd say 0.5 BAR more, maybe more.

[Marks DTM Calib]

Its the expansion vessel OK and large enough?

[Kevin Wood]

Might be time for the Radweld soon.

[feeutfo]

This any use Chris: http://inspectapedia.com/plumbing/Hot_Water_Expansion.htm

ooh good lord, a quick glance and i'll need some to digest that.

thanks Shak

[feeutfo]

Depends how large the system is relative to the size of the pressure vessel really.

Try it. Fill it to 1 bar stone cold, then fire up the heating to maximum temperature with all radiators on. Once the boiler has cut out, check the pressure rise. I'd say 0.5 BAR more, maybe more.

yes its nowhere near that much, 0.1 maybe, but as the heating is in use its hard to measure, its on 24/7 atm

[feeutfo]

Its the expansion vessel OK and large enough?

looks almost new, no leaks, takes the expansion from zero to 1.5 bar with no problems afaict

[feeutfo]

Might be time for the Radweld soon.

it might work now, as the main leak has been fixed. it was loosing all pressure over 24 hours, previously.

except the system is now sealed. although i do have a pot of said mischief in the garage.

[TheBoy]

Depends how large the system is relative to the size of the pressure vessel really.

Try it. Fill it to 1 bar stone cold, then fire up the heating to maximum temperature with all radiators on. Once the boiler has cut out, check the pressure rise. I'd say 0.5 BAR more, maybe more.

yes its nowhere near that much, 0.1 maybe, but as the heating is in use its hard to measure, its on 24/7 atm

Easy fixed. Dig out her coat, then turn the switch off

[Marks DTM Calib]

Its the expansion vessel OK and large enough?

looks almost new, no leaks, takes the expansion from zero to 1.5 bar with no problems afaict

Do you know what size it is and have you checked the air pressure on it?

[feeutfo]

Its the expansion vessel OK and large enough?

looks almost new, no leaks, takes the expansion from zero to 1.5 bar with no problems afaict

Do you know what size it is and have you checked the air pressure on it?

give me 5 mins

[feeutfo]

its at 20psi

no obvious indication of size on the label, but its almost the exact same size as a pressure cooker, maybe slightly bigger. 1foot x1foot minimum