boiler kettling?

[mac1]

did you ever get an rgi in to inspect? see many problems on low water content heat exchangers fitted to old open vent systems where pipework is not suitable owing to feed/expansion and pump orientation not being suitable.

If it was this I suspect water would be so full of sludge etc it would no longer work

I had it flushed through twice at a great expense. Its allways had this problem. Had it serviced in December and the engineer didnt seem to b eto concerned about it. But it appear sto be getting noisier.My question is. Is it dangerous not to rectify the kettling?Whats th eworst that could happen.
Thanks

 

[Agile]

About the worst that could happen is for the expensive heat exchanger to burst and the resulting spilled water to blow up the PCB and for the leaking water to bring down a ceiling if its fitted upstairs.

Tony

 

[DP]

I wonder if kettling is due to poor circulation instead of sedimentation. System water has to flow through the main heat exchanger at a rate such that heat generated is removed from the heat exchanger. If the flow is too slow, knocking will take place.

What is the system pressure?

Once had a boiler kettle when a well known brand of inhibitor was used- instead of inhibiting the additive became very dark and viscous to result in knocking boiler.

Cannot visulise extensive property damage from burst main HE in the Ideal. Once system pressure zero, no more water from boiler to bring ceiling down (unless my understanding is flawed)

 

[mac1]

Thanks for all your replies. Do you then think I should just leave it or would you get in a trades. Bearing in mind that the last time the boiler was serviced the kettling didnt seem to bother them.

 

[Agile]

I was giving the worst case!

Whilst in a sealed system the amount of water to leak is limited to a maximum of the total water content of about 80 litres one has to consider the actual worst case in arriving at a risk assessment.

That is achieved when the filling loop has been left open which I find in about 10-20% of installations. In that case the leaking water will continue at up to about 10-15 li/min which can cause a lot of damage.

In the OPs case this kettling might be caused by lime deposition as a result of incorrect commissioning.

The feature of gas creation indicated ongoing corrosion and that does need investigation.

Afterwards dosing with X200 might reduce/stop the kettling.

Tony

 

[mac1]

I was giving the worst case!

Whilst in a sealed system the amount of water to leak is limited to a maximum of the total water content of about 80 litres one has to consider the actual worst case in arriving at a risk assessment.

That is achieved when the filling loop has been left open which I find in about 10-20% of installations. In that case the leaking water will continue at up to about 10-15 li/min which can cause a lot of damage.

In the OPs case this kettling might be caused by lime deposition as a result of incorrect commissioning.

The feature of gas creation indicated ongoing corrosion and that does need investigation.

Afterwards dosing with X200 might reduce/stop the kettling.

Tony

thanks for all your knowledgable replies, great stuff. Ive noticed you lot are very competitive with each other as to who is right and wrong. I would say you were all right given the individual circumstances which is changeable. so thanks again for all your help.