pumping over . any clues

[mysteryman]

Any system which is pumping over is wrong, regardless of blockages. You need to get this sorted, as all sorts of problems are there, which will shorten the life of the whole heating system.

 

[45yearsagasman]

View media item 39013Look for problems in this area. Use a magnet to detect any blockages. The magnet will attract to the copper.

 

[Agile]

Magnets dont normally attract to copper!

 

[JohnD]

the magnet will be attracted towards the copper pipe because of the black magnetite iron corrosion sediment inside it

 

[45yearsagasman]

I didn't think I had to explain it to you Mr Glazier when the details are on the drawing. !!!!!
Or is that your infamous sense of humour?

 

[mysteryman]

The point is that pumping over is always wrong. If a system pumps over when partially blocked, the layout is still and always was wrong.

 

[PowerFlushAssociation]

This is more common that people think. There is a hard sludge build-up where the vent and down feed pipe meets the return pipe just before the pump. It has to be cut out and cleaned or replaced.

 

[Agile]

The blockage at this point is not normal sludge but seems to contain calcium which makes it very hard indeed.

HCl will dissolve it but thats not a good thing to use on copper pipework so it always has to be cut out. Its also virtually impossible to drill through it.

Tony

 

[bluegambler]

We cannot assume that your assessment of the conditionn of the header tank is adequate.

Please post a picture looking at an angle downwards into the header tank.

Pumps dont detach themselves during the night and refit themselves the wrong way ro9und!

Tony

The pump was changed about eighteen months ago, which may have coincided with the pumping over starting - thats why I'm wondering if its possible to fit a pump the wrong way round .Thanks