how many litres should drain from one radiator?

[glasgowm8]

hey guys

trying to drain a radiator (via bleed valve) so can take out the half nut to input some sentinel via a funnel. ive put the trv to 0 and shut off lockshield valve but now ive drained like 7 litres from the radiator and now wondering is this normal? the radiator is a 600 by 500 smallish one. how many litres of water is normal to be drained from this radiator?

 

[durhamplumber]

one or both of your valves must be passing.

 

[glasgowm8]

even though the radiator was stone cold and both pipes cold when i turned the heating on?

 

[D_Hailsham]

how many litres of water is normal to be drained from this radiator?

A 600 mm high single rad holds about 0.1 litre per section (vertical channel), a double about 0.2 litres per section.

A 500mm wide single will be about 1.65 litres; a double about 3.3 litres.

 

[glasgowm8]

so basically if i try other radiators i should be lookin at no more than say 5ish litres?

 

[Dean744PiN5]

As has been said your valves are letting by and even if they weren't you won't drain a sufficient amount from the top of the rad to administer the inhibitor.
Choose another rad, release bleed nipple till flow stops then get a tub under a valve and crack open a nut on the valve till a couple of litres drained and then Put the inhibitor in.

 

[GavThePlumber]

Pump the inhibitor in under pressure using a pressure sprayer, premix it, that is how plumbers do it with f*cked up valves.

http://www.screwfix.com/p/pressure-sprayer-7ltr/51100

 

[glasgowm8]

ive got a radiatr in the bathroom that has two wheel movable lockshield valves. i think this mite be the bypass radiator...can i go ahead and turn this radiator off and use this to put in inhibitor then put lockshields back on after anticlockwise?

 

[GavThePlumber]

Put it in any radiator bud. I don't even use inhibitor in my own house, never have.

 

[glasgowm8]

surprised a plumber like ur self wont use inhibitor?

 

[GavThePlumber]

Refer to first principles, what causes reaction in a heating system? Oxygen.

 

[glasgowm8]

when i open the 1/2 nut at the top to put in inhibitor via the funnel will the 1/2 nut screw bac in as normal or do i need pfte tape to wrap round the nut before putting back in?

 

[onlyfitidealboilers]

Refer to first principles, what causes reaction in a heating system? Oxygen.

Oh dear.

 

[45yearsagasman]

FFS, don't resurrect that old argument. Fernox and Sentinel obviously don't know anything about water treatment!!!