An old boiler (30 years or so) has been kettling increasingly over time, and is now doing so badly. It now kettles strongly while the flame is on, rather than when the pump stops. Previously it has been addressed by turning down the primary stat and fitting a pump overrun. Primary stat is at minimum.. The boiler weeps a bit at times, and is kept sealed up with sodium silicate in the primary, that's been in there for at least a decade. It still passes its tests, and replacement is planned for next year. But the level of kettling is now unacceptable.

I can only presume the cause of the problem is reduced flow. The question is why. Sludge? An ever growing lump of waterglass inside the boiler heat exchanger tubing? Gradual pump impellor disintegration? Something else? How can I find out, short of major dismantling?

All but one rads have a TRV. It's an S plan system.


NT

On 29/07/2016 19:18, wrote:
An old boiler (30 years or so) has been kettling increasingly over
time, and is now doing so badly. It now kettles strongly while the
flame is on, rather than when the pump stops. Previously it has been
addressed by turning down the primary stat and fitting a pump
overrun. Primary stat is at minimum.. The boiler weeps a bit at
times, and is kept sealed up with sodium silicate in the primary,
that's been in there for at least a decade. It still passes its
tests, and replacement is planned for next year. But the level of
kettling is now unacceptable.

I can only presume the cause of the problem is reduced flow. The
question is why. Sludge? An ever growing lump of waterglass inside
the boiler heat exchanger tubing? Gradual pump impellor
disintegration? Something else? How can I find out, short of major
dismantling?

All but one rads have a TRV. It's an S plan system.


NT

Some months ago, our very, very old Kingfisher boiler had been making
quite a lot of kettling noise. I separately replaced both the three-way
valve and the pump. Shocking how bad both were inside - amazing they
were working at all! Kettling reduced dramatically. I think the biggest
effect was the pump - I used an Alpha 2.

Thankfully, that system is no longer our responsibility.

--
Rod

On Friday, 29 July 2016 19:18:36 UTC+1, wrote:
An old boiler (30 years or so) has been kettling increasingly over time, and is now doing so badly. It now kettles strongly while the flame is on, rather than when the pump stops. Previously it has been addressed by turning down the primary stat and fitting a pump overrun. Primary stat is at minimum. The boiler weeps a bit at times, and is kept sealed up with sodium silicate in the primary, that's been in there for at least a decade. It still passes its tests, and replacement is planned for next year. But the level of kettling is now unacceptable.

I can only presume the cause of the problem is reduced flow. The question is why. Sludge? An ever growing lump of waterglass inside the boiler heat exchanger tubing? Gradual pump impellor disintegration? Something else? How can I find out, short of major dismantling?

All but one rads have a TRV. It's an S plan system.


NT

Kettling can be caused by several things.
One is local hot spots on the heat exchanger.
Caused by silt, corrosion and scale on the wet side.
(Prevents heat from transfering).
A chemical cleaning might fix it.
Might also start a leak or two!

On Friday, 29 July 2016 19:45:22 UTC+1, harry wrote:
On Friday, 29 July 2016 19:18:36 UTC+1, wrote:
An old boiler (30 years or so) has been kettling increasingly over time, and is now doing so badly. It now kettles strongly while the flame is on, rather than when the pump stops. Previously it has been addressed by turning down the primary stat and fitting a pump overrun. Primary stat is at minimum. The boiler weeps a bit at times, and is kept sealed up with sodium silicate in the primary, that's been in there for at least a decade. It still passes its tests, and replacement is planned for next year. But the level of kettling is now unacceptable.

I can only presume the cause of the problem is reduced flow. The question is why. Sludge? An ever growing lump of waterglass inside the boiler heat exchanger tubing? Gradual pump impellor disintegration? Something else? How can I find out, short of major dismantling?

All but one rads have a TRV. It's an S plan system.


NT

Kettling can be caused by several things.
One is local hot spots on the heat exchanger.
Caused by silt, corrosion and scale on the wet side.
(Prevents heat from transfering).
A chemical cleaning might fix it.
Might also start a leak or two!

Additionally, you need to add chemicals to the water in the system system which reduces corrosion and also reduces kettling in some cases by increasing the boiling point of the water, (read instructions).

On 29/07/2016 19:18, wrote:
An old boiler (30 years or so) has been kettling increasingly over
time, and is now doing so badly. It now kettles strongly while the
flame is on, rather than when the pump stops. Previously it has been
addressed by turning down the primary stat and fitting a pump
overrun. Primary stat is at minimum. The boiler weeps a bit at times,
and is kept sealed up with sodium silicate in the primary, that's
been in there for at least a decade. It still passes its tests, and
replacement is planned for next year. But the level of kettling is
now unacceptable.

I can only presume the cause of the problem is reduced flow. The
question is why. Sludge? An ever growing lump of waterglass inside
the boiler heat exchanger tubing? Gradual pump impellor
disintegration? Something else? How can I find out, short of major
dismantling?

All but one rads have a TRV. It's an S plan system.

Lob a can of sentinel boiler noise reducer in there... probably about
the only amount of effort worth wasting on it.


--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

On Friday, 29 July 2016 23:38:13 UTC+1, John Rumm wrote:
On 29/07/2016 19:18, tabbypurr wrote:

An old boiler (30 years or so) has been kettling increasingly over
time, and is now doing so badly. It now kettles strongly while the
flame is on, rather than when the pump stops. Previously it has been
addressed by turning down the primary stat and fitting a pump
overrun. Primary stat is at minimum. The boiler weeps a bit at times,
and is kept sealed up with sodium silicate in the primary, that's
been in there for at least a decade. It still passes its tests, and
replacement is planned for next year. But the level of kettling is
now unacceptable.

I can only presume the cause of the problem is reduced flow. The
question is why. Sludge? An ever growing lump of waterglass inside
the boiler heat exchanger tubing? Gradual pump impellor
disintegration? Something else? How can I find out, short of major
dismantling?

All but one rads have a TRV. It's an S plan system.

Lob a can of sentinel boiler noise reducer in there... probably about
the only amount of effort worth wasting on it.

That won't stop it deteriorating. I suppose the only way to really find out the cause is to dismantle each item to see what's in good shape & what isn't. I hate plumbing.


NT

On Fri, 29 Jul 2016 11:18:32 -0700 (PDT)
wrote:

An old boiler (30 years or so) has been kettling increasingly over
time, and is now doing so badly. It now kettles strongly while the
flame is on, rather than when the pump stops. Previously it has been
addressed by turning down the primary stat and fitting a pump
overrun. Primary stat is at minimum. The boiler weeps a bit at times,
and is kept sealed up with sodium silicate in the primary, that's
been in there for at least a decade. It still passes its tests, and
replacement is planned for next year. But the level of kettling is
now unacceptable.

I can only presume the cause of the problem is reduced flow. The
question is why. Sludge? An ever growing lump of waterglass inside
the boiler heat exchanger tubing? Gradual pump impellor
disintegration? Something else? How can I find out, short of major
dismantling?

All but one rads have a TRV. It's an S plan system.


NT

When our system started to make the dreaded noise, we got a local
plumber with a good reputation to clean the system with a pumped
chemical cleaner. It's now wonderfully silent, and has inhibitor in it.

Money well spent, in our opinion.

--
Davey.

In article ,
Davey wrote:
On Fri, 29 Jul 2016 11:18:32 -0700 (PDT)
wrote:

An old boiler (30 years or so) has been kettling increasingly over
time, and is now doing so badly. It now kettles strongly while the
flame is on, rather than when the pump stops. Previously it has been
addressed by turning down the primary stat and fitting a pump
overrun. Primary stat is at minimum. The boiler weeps a bit at times,
and is kept sealed up with sodium silicate in the primary, that's
been in there for at least a decade. It still passes its tests, and
replacement is planned for next year. But the level of kettling is
now unacceptable.

I can only presume the cause of the problem is reduced flow. The
question is why. Sludge? An ever growing lump of waterglass inside
the boiler heat exchanger tubing? Gradual pump impellor
disintegration? Something else? How can I find out, short of major
dismantling?

All but one rads have a TRV. It's an S plan system.


NT

When our system started to make the dreaded noise, we got a local
plumber with a good reputation to clean the system with a pumped
chemical cleaner. It's now wonderfully silent, and has inhibitor in it.

Money well spent, in our opinion.

we had our system professionally cleaned a few years ago. It all went
silent. Despite using inhibitor and noise reducer , kettling is now back.

--
from KT24 in Surrey, England

On Saturday, 30 July 2016 00:48:17 UTC+1, Davey wrote:
On Fri, 29 Jul 2016 11:18:32 -0700 (PDT)
tabbypurr wrote:

An old boiler (30 years or so) has been kettling increasingly over
time, and is now doing so badly. It now kettles strongly while the
flame is on, rather than when the pump stops. Previously it has been
addressed by turning down the primary stat and fitting a pump
overrun. Primary stat is at minimum. The boiler weeps a bit at times,
and is kept sealed up with sodium silicate in the primary, that's
been in there for at least a decade. It still passes its tests, and
replacement is planned for next year. But the level of kettling is
now unacceptable.

I can only presume the cause of the problem is reduced flow. The
question is why. Sludge? An ever growing lump of waterglass inside
the boiler heat exchanger tubing? Gradual pump impellor
disintegration? Something else? How can I find out, short of major
dismantling?

All but one rads have a TRV. It's an S plan system.

When our system started to make the dreaded noise, we got a local
plumber with a good reputation to clean the system with a pumped
chemical cleaner. It's now wonderfully silent, and has inhibitor in it.

Money well spent, in our opinion.

I'm told it's been quiet today. So I'll get a magnaclean type filter on it, and empty it when I'm up there.


NT

On 30/07/2016 00:27, wrote:
On Friday, 29 July 2016 23:38:13 UTC+1, John Rumm wrote:
On 29/07/2016 19:18, tabbypurr wrote:

An old boiler (30 years or so) has been kettling increasingly
over time, and is now doing so badly. It now kettles strongly
while the flame is on, rather than when the pump stops.
Previously it has been addressed by turning down the primary stat
and fitting a pump overrun. Primary stat is at minimum. The
boiler weeps a bit at times, and is kept sealed up with sodium
silicate in the primary, that's been in there for at least a
decade. It still passes its tests, and replacement is planned for
next year. But the level of kettling is now unacceptable.

I can only presume the cause of the problem is reduced flow. The
question is why. Sludge? An ever growing lump of waterglass
inside the boiler heat exchanger tubing? Gradual pump impellor
disintegration? Something else? How can I find out, short of
major dismantling?

All but one rads have a TRV. It's an S plan system.

Lob a can of sentinel boiler noise reducer in there... probably
about the only amount of effort worth wasting on it.

That won't stop it deteriorating. I suppose the only way to really
find out the cause is to dismantle each item to see what's in good
shape & what isn't. I hate plumbing.

If its being replaced anyway, how much do you care?

The causes are typically heavy scaling or other contamination of the HE
inner surfaces, or something that is producing inadequate flow
(obstruction or failing pump). You could replace the pump, check the
valves, and then flush the system, and finally give it a full de-scale.
Although I suspect that if I were going to that much trouble I would
replace the boiler and any knackered looking rads at the same time.




--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

On Saturday, 30 July 2016 11:34:32 UTC+1, John Rumm wrote:
On 30/07/2016 00:27, tabbypurr wrote:
On Friday, 29 July 2016 23:38:13 UTC+1, John Rumm wrote:
On 29/07/2016 19:18, tabbypurr wrote:

An old boiler (30 years or so) has been kettling increasingly
over time, and is now doing so badly. It now kettles strongly
while the flame is on, rather than when the pump stops.
Previously it has been addressed by turning down the primary stat
and fitting a pump overrun. Primary stat is at minimum. The
boiler weeps a bit at times, and is kept sealed up with sodium
silicate in the primary, that's been in there for at least a
decade. It still passes its tests, and replacement is planned for
next year. But the level of kettling is now unacceptable.

I can only presume the cause of the problem is reduced flow. The
question is why. Sludge? An ever growing lump of waterglass
inside the boiler heat exchanger tubing? Gradual pump impellor
disintegration? Something else? How can I find out, short of
major dismantling?

All but one rads have a TRV. It's an S plan system.

Lob a can of sentinel boiler noise reducer in there... probably
about the only amount of effort worth wasting on it.

That won't stop it deteriorating. I suppose the only way to really
find out the cause is to dismantle each item to see what's in good
shape & what isn't. I hate plumbing.

If its being replaced anyway, how much do you care?

The causes are typically heavy scaling or other contamination of the HE
inner surfaces, or something that is producing inadequate flow
(obstruction or failing pump). You could replace the pump, check the
valves, and then flush the system, and finally give it a full de-scale.
Although I suspect that if I were going to that much trouble I would
replace the boiler and any knackered looking rads at the same time.

Replacement is due in a year. I really don't want to do it now if it's avoidable, so much else to do. New pump & magnaclean are due for when the new boiler goes in anyway, so I can try and fit those in as soon as poss. Maybe if I don't post here for a month I'll have saved the time to do it! Did I mention I hate plumbing?

Would cleaning chemicals dissolve the waterglass? If so, it's gonna leak badly. If not, it might stay part blocked.


NT

Wrote in message:
On Saturday, 30 July 2016 11:34:32 UTC+1, John Rumm wrote:
On 30/07/2016 00:27, tabbypurr wrote:
On Friday, 29 July 2016 23:38:13 UTC+1, John Rumm wrote:
On 29/07/2016 19:18, tabbypurr wrote:

An old boiler (30 years or so) has been kettling increasingly
over time, and is now doing so badly. It now kettles strongly
while the flame is on, rather than when the pump stops.
Previously it has been addressed by turning down the primary stat
and fitting a pump overrun. Primary stat is at minimum. The
boiler weeps a bit at times, and is kept sealed up with sodium
silicate in the primary, that's been in there for at least a
decade. It still passes its tests, and replacement is planned for
next year. But the level of kettling is now unacceptable.

I can only presume the cause of the problem is reduced flow. The
question is why. Sludge? An ever growing lump of waterglass
inside the boiler heat exchanger tubing? Gradual pump impellor
disintegration? Something else? How can I find out, short of
major dismantling?

All but one rads have a TRV. It's an S plan system.

Lob a can of sentinel boiler noise reducer in there... probably
about the only amount of effort worth wasting on it.

That won't stop it deteriorating. I suppose the only way to really
find out the cause is to dismantle each item to see what's in good
shape & what isn't. I hate plumbing.

If its being replaced anyway, how much do you care?

The causes are typically heavy scaling or other contamination of the HE
inner surfaces, or something that is producing inadequate flow
(obstruction or failing pump). You could replace the pump, check the
valves, and then flush the system, and finally give it a full de-scale.
Although I suspect that if I were going to that much trouble I would
replace the boiler and any knackered looking rads at the same time.

Replacement is due in a year. I really don't want to do it now if it's avoidable, so much else to do. New pump & magnaclean are due for when the new boiler goes in anyway, so I can try and fit those in as soon as poss. Maybe if I don't post here for a month I'll have saved the time to do it! Did I mention I hate plumbing?

Would cleaning chemicals dissolve the waterglass? If so, it's gonna leak badly. If not, it might stay part blocked.


NT


Having spent quite a bit of time on the old boiler in my current
place some 6 years ago, I discovered that the Fernox inhibitor
MB1 made a good job of quietening the kettling without
additional products.

Phil
--


----Android NewsGroup Reader----
http://usenet.sinaapp.com/

In article , TheChief
wrote:
Wrote in message:
On Saturday, 30 July 2016 11:34:32 UTC+1, John Rumm wrote:
On 30/07/2016 00:27, tabbypurr wrote:
On Friday, 29 July 2016 23:38:13 UTC+1, John Rumm wrote:
On 29/07/2016 19:18, tabbypurr wrote:

An old boiler (30 years or so) has been kettling increasingly over
time, and is now doing so badly. It now kettles strongly while the
flame is on, rather than when the pump stops. Previously it has
been addressed by turning down the primary stat and fitting a pump
overrun. Primary stat is at minimum. The boiler weeps a bit at
times, and is kept sealed up with sodium silicate in the primary,
that's been in there for at least a decade. It still passes its
tests, and replacement is planned for next year. But the level of
kettling is now unacceptable.

I can only presume the cause of the problem is reduced flow. The
question is why. Sludge? An ever growing lump of waterglass inside
the boiler heat exchanger tubing? Gradual pump impellor
disintegration? Something else? How can I find out, short of major
dismantling?

All but one rads have a TRV. It's an S plan system.

Lob a can of sentinel boiler noise reducer in there... probably
about the only amount of effort worth wasting on it.

That won't stop it deteriorating. I suppose the only way to really
find out the cause is to dismantle each item to see what's in good
shape & what isn't. I hate plumbing.

If its being replaced anyway, how much do you care?

The causes are typically heavy scaling or other contamination of the
HE inner surfaces, or something that is producing inadequate flow
(obstruction or failing pump). You could replace the pump, check the
valves, and then flush the system, and finally give it a full
de-scale. Although I suspect that if I were going to that much
trouble I would replace the boiler and any knackered looking rads at
the same time.

Replacement is due in a year. I really don't want to do it now if it's
avoidable, so much else to do. New pump & magnaclean are due for when
the new boiler goes in anyway, so I can try and fit those in as soon as
poss. Maybe if I don't post here for a month I'll have saved the time
to do it! Did I mention I hate plumbing?

Would cleaning chemicals dissolve the waterglass? If so, it's gonna
leak badly. If not, it might stay part blocked.


NT


Having spent quite a bit of time on the old boiler in my current place
some 6 years ago, I discovered that the Fernox inhibitor MB1 made a good
job of

I've been usinga Screwfix product. Is that a mistake?

--
from KT24 in Surrey, England

On 30/07/2016 21:22, charles wrote:
I've been usinga Screwfix product. Is that a mistake?

I too used a Screwfix product and it worked fine. When I had to
partially drain the system to replace pump, then the three-way valve
some months later, the fluid was almost water-clear. A huge contrast to
when I first cleaned the system out and put inhibitor into the system -
many years ago.

--
Rod

On Friday, 28 October 2016 10:18:42 UTC+1, Dragon Ball wrote:

You ask what do not consult a professional company's customer service? They can help you solve the problem online.

They could. Slowly, stupidly, expensively. Here we diy.


NT