Why is it that at this time of year, when its hard to get folk to look at
central heating my neighbours pump starts soundling alike a very noisy motor
bolted to a sounding board. I suspect its somewhere in the room directly
next to my listening room, so all I can hear is the rumble driving my mad
for the last several hours. Sounds like the bearing is bouncing around.
Is there a good way to stop this racket next time? IE mount it in foam
or something as this is not the first time in about five years sincce she
had this system that this problem has happened.
Brian

--
From the Sofa of Brian Gaff Reply address is active

On 28/12/2014 22:31, Brian Gaff wrote:
Why is it that at this time of year, when its hard to get folk to look at
central heating my neighbours pump starts soundling alike a very noisy motor
bolted to a sounding board. I suspect its somewhere in the room directly
next to my listening room, so all I can hear is the rumble driving my mad
for the last several hours. Sounds like the bearing is bouncing around.
Is there a good way to stop this racket next time? IE mount it in foam
or something as this is not the first time in about five years sincce she
had this system that this problem has happened.
Brian

Blow their main fuse?

I do agree. Seems worst when the heating is on but little demand for
heat - so the pump is pumping more than needed. So it is less of an
issue in real cold weather than either side of summer.

--
Rod

On 28/12/2014 22:31, Brian Gaff wrote:
Why is it that at this time of year, when its hard to get folk to look at
central heating my neighbours pump starts soundling alike a very noisy motor
bolted to a sounding board. I suspect its somewhere in the room directly
next to my listening room, so all I can hear is the rumble driving my mad
for the last several hours. Sounds like the bearing is bouncing around.
Is there a good way to stop this racket next time? IE mount it in foam
or something as this is not the first time in about five years sincce she
had this system that this problem has happened.
Brian

After years of service our Grundfos CH pump was clearly on its last
legs, making unseemly clattering noises when starting up as well as its
normal background rumbling noise, so I decided to get it replaced before
it packed up altogether. I chose a replacement Grundfos ALPHA2 L unit
that offered high electrical efficiency and dynamic pressure modulation,
rather than the cheapest "straight replacement" on offer.

I'm really pleased with the outcome. We no longer have *any* audible
feedback as to whether the pump is working: it is practically silent.

It's difficult to identify precisely how much the electrical efficiency
aspect has reduced running costs (spec. says 5 to 20 watts versus 50 to
70 watts in my case) but the relief from thirty-odd years of heating
pump drone is *very* welcome.

Including fitting, £120 - a real bargain.

So Brian, it may be worth proposing a replacement unit: power saving
cost saving for your neighbour and sound reduction for you.

"Brian Gaff" wrote in message
...
Why is it that at this time of year, when its hard to get folk to look at
central heating my neighbours pump starts soundling alike a very noisy
motor bolted to a sounding board. I suspect its somewhere in the room
directly next to my listening room, so all I can hear is the rumble
driving my mad for the last several hours. Sounds like the bearing is
bouncing around.
Is there a good way to stop this racket next time? IE mount it in foam
or something as this is not the first time in about five years sincce she
had this system that this problem has happened.
Brian

--
From the Sofa of Brian Gaff Reply address is active


Most pump noise is due to cavitation.
Either directly or indirectly because the cavition has caused uneven wear on
the impellor causing the pump to be unbalanced. So it gradually gets
noisier.

Cavition is caused by too high a water temperature and too low a pressure in
the pump.
Sometimes the problem can be cured by increasing the system pressure.
Or reducing the pump speed if feasible.
Depends on how worn the pump impellor has become. Prevention being the
thing.

Well nobody told the pump this then as last night was the coldest so far
this winter. i notice its not doing it this morning so far. Last time it
started this sh claimed a gental tap stopped it for a while.
Weird.
Brian

--
From the Sofa of Brian Gaff Reply address is active
"polygonum" wrote in message
...
On 28/12/2014 22:31, Brian Gaff wrote:
Why is it that at this time of year, when its hard to get folk to look
at
central heating my neighbours pump starts soundling alike a very noisy
motor
bolted to a sounding board. I suspect its somewhere in the room directly
next to my listening room, so all I can hear is the rumble driving my
mad
for the last several hours. Sounds like the bearing is bouncing around.
Is there a good way to stop this racket next time? IE mount it in
foam
or something as this is not the first time in about five years sincce
she
had this system that this problem has happened.
Brian

Blow their main fuse?

I do agree. Seems worst when the heating is on but little demand for
heat - so the pump is pumping more than needed. So it is less of an issue
in real cold weather than either side of summer.

--
Rod

In article ,
"Brian Gaff" writes:
Why is it that at this time of year, when its hard to get folk to look at
central heating my neighbours pump starts soundling alike a very noisy motor
bolted to a sounding board. I suspect its somewhere in the room directly
next to my listening room, so all I can hear is the rumble driving my mad
for the last several hours. Sounds like the bearing is bouncing around.
Is there a good way to stop this racket next time? IE mount it in foam
or something as this is not the first time in about five years sincce she
had this system that this problem has happened.
Brian

Could be as simple as something leaning against the pipework which is
pushing it against a wall.

There are rubber lined pipe brackets for use near pumps, to reduce
the vibration coupling to the wall.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

"Brian Gaff" wrote in message ...

Well nobody told the pump this then as last night was the coldest so far
this winter. i notice its not doing it this morning so far. Last time it
started this sh claimed a gental tap stopped it for a while.
Weird.
Brian


Bit confused here... did you mean genital, or gentle?

On Mon, 29 Dec 2014 07:52:48 -0000, Brian Gaff wrote:

Well nobody told the pump this then as last night was the coldest so far
this winter. i notice its not doing it this morning so far. Last time it
started this sh claimed a gental tap stopped it for a while.

A pump should last for a lot longer than 5 years. Do they always get
it replaced by the same person/company? Is the installer bleeding it
after installation? Do they bleed it every year? Is it installed
correctly? IIRC the impellor end of the shaft should always be lower
than the motor end.

Bleeding it now may well cure the noise.

--
Cheers
Dave.

On 29/12/2014 01:49, nemo wrote:
It's difficult to identify precisely how much the electrical efficiency
aspect has reduced running costs (spec. says 5 to 20 watts versus 50 to
70 watts in my case) but the relief from thirty-odd years of heating
pump drone is *very* welcome.

The noise reduction may well be welcome, but I doubt the running cost
change will be much. You've saved 60W on the pump. Most of the old 60W
would have ended up in the water it was pumping, so what you've actually
saved is 60W * (difference between gas and electric). Allowing for
boiler efficiency of course...

Andy

On 29/12/2014 21:46, Vir Campestris wrote:
On 29/12/2014 01:49, nemo wrote:
It's difficult to identify precisely how much the electrical efficiency
aspect has reduced running costs (spec. says 5 to 20 watts versus 50 to
70 watts in my case) but the relief from thirty-odd years of heating
pump drone is *very* welcome.

The noise reduction may well be welcome, but I doubt the running cost
change will be much. You've saved 60W on the pump. Most of the old 60W
would have ended up in the water it was pumping, so what you've actually
saved is 60W * (difference between gas and electric). Allowing for
boiler efficiency of course...

Andy

Agreed. I wouldn't have considered it worth swapping just to get better
economy, but the old'un was on its way out anyway. The annual running
cost saving is tiny but will actually recoup the price difference within
a couple of years or so.