So, old SMC Comet 2-130 pump stopped working. The "motor" part was still
getting hot, and still getting 250v to it.

Took the front part off, and it seems like the motor is divided into ... er,
....guessing here - an induction bit (the flat plate you can see) and I'm
guessing the impeller is the actual armature(?) of the motor. The impeller
works fine. Except it is SOLIDLY welded to its pump nuts and in any case
would be a total bitch to get to, to remove.
Looking at this pump, which I believe is quite old, and bearing in mind the
trip to the plumbers merchant is a little way and I only want to make the
trip once...
http://i27.photobucket.com/albums/c1...ating_pump.jpg
....if I bought a new pump, would I just be able to take it apart and clamp
the new induction bit onto the old impeller part?

Many thanks.

In message , Jonathan
writes
So, old SMC Comet 2-130 pump stopped working. The "motor" part was still
getting hot, and still getting 250v to it.

Took the front part off, and it seems like the motor is divided into ... er,
...guessing here - an induction bit (the flat plate you can see) and I'm
guessing the impeller is the actual armature(?) of the motor. The impeller
works fine. Except it is SOLIDLY welded to its pump nuts and in any case
would be a total bitch to get to, to remove.
Looking at this pump, which I believe is quite old, and bearing in mind the
trip to the plumbers merchant is a little way and I only want to make the
trip once...
http://i27.photobucket.com/albums/c1...ating_pump.jpg
...if I bought a new pump, would I just be able to take it apart and clamp
the new induction bit onto the old impeller part?

You should be able to

whether you actually can in practice or not ..

--
geoff

Jonathan wrote:

So, old SMC Comet 2-130 pump stopped working. The "motor" part was still
getting hot, and still getting 250v to it.

Took the front part off, and it seems like the motor is divided into ... er,
...guessing here - an induction bit (the flat plate you can see) and I'm
guessing the impeller is the actual armature(?) of the motor. The impeller
works fine. Except it is SOLIDLY welded to its pump nuts and in any case
would be a total bitch to get to, to remove.
Looking at this pump, which I believe is quite old, and bearing in mind the
trip to the plumbers merchant is a little way and I only want to make the
trip once...
http://i27.photobucket.com/albums/c1...ating_pump.jpg
...if I bought a new pump, would I just be able to take it apart and clamp
the new induction bit onto the old impeller part?

Many thanks.

maybe if the new one really is identical, but if its an old pump the
odds are against that. All you could do is get same model and try, if
not you'll just have to replace the whole item.


NT

On Thu, 30 Nov 2006 21:56:46 +0000, Jonathan wrote:

So, old SMC Comet 2-130 pump stopped working. The "motor" part was still
getting hot, and still getting 250v to it.

Took the front part off, and it seems like the motor is divided into ... er,
...guessing here - an induction bit (the flat plate you can see) and I'm
guessing the impeller is the actual armature(?) of the motor. The impeller
works fine. Except it is SOLIDLY welded to its pump nuts and in any case
would be a total bitch to get to, to remove.
Looking at this pump, which I believe is quite old, and bearing in mind the
trip to the plumbers merchant is a little way and I only want to make the
trip once...
http://i27.photobucket.com/albums/c1...ating_pump.jpg
...if I bought a new pump, would I just be able to take it apart and clamp
the new induction bit onto the old impeller part?


Sadly not. Modern pumps have a different design where the rotor runs back
through the cylindrical body of the pump and is surrounded by the
induction coils (which are on the dry side of the water barrier,
natch). I guess they just couldn't get the sort of power produced by
modern pumps out of the design with the stainless-steel diaphragm.

John Stumbles wrote:
On Thu, 30 Nov 2006 21:56:46 +0000, Jonathan wrote:

So, old SMC Comet 2-130 pump stopped working. The "motor" part was still
getting hot, and still getting 250v to it.

Took the front part off, and it seems like the motor is divided into ... er,
...guessing here - an induction bit (the flat plate you can see) and I'm
guessing the impeller is the actual armature(?) of the motor. The impeller
works fine. Except it is SOLIDLY welded to its pump nuts and in any case
would be a total bitch to get to, to remove.
Looking at this pump, which I believe is quite old, and bearing in mind the
trip to the plumbers merchant is a little way and I only want to make the
trip once...
http://i27.photobucket.com/albums/c1...ating_pump.jpg
...if I bought a new pump, would I just be able to take it apart and clamp
the new induction bit onto the old impeller part?

Sadly not. Modern pumps have a different design where the rotor runs back
through the cylindrical body of the pump and is surrounded by the
induction coils (which are on the dry side of the water barrier,
natch). I guess they just couldn't get the sort of power produced by
modern pumps out of the design with the stainless-steel diaphragm.

ebay might be worth a shot to get the same model, an old one that
works. Maybe, if very lucky. Doubtful tho.


NT

In message .com,
writes
Jonathan wrote:

So, old SMC Comet 2-130 pump stopped working. The "motor" part was still
getting hot, and still getting 250v to it.

Took the front part off, and it seems like the motor is divided into ... er,
...guessing here - an induction bit (the flat plate you can see) and I'm
guessing the impeller is the actual armature(?) of the motor. The impeller
works fine. Except it is SOLIDLY welded to its pump nuts and in any case
would be a total bitch to get to, to remove.
Looking at this pump, which I believe is quite old, and bearing in mind the
trip to the plumbers merchant is a little way and I only want to make the
trip once...
http://i27.photobucket.com/albums/c1...ating_pump.jpg
...if I bought a new pump, would I just be able to take it apart and clamp
the new induction bit onto the old impeller part?

Many thanks.

maybe if the new one really is identical, but if its an old pump the
odds are against that. All you could do is get same model and try, if
not you'll just have to replace the whole item.


I think that the bases are fairly standard


--
geoff

On Nov 30, 9:56 pm, "Jonathan" wrote:
....http://i27.photobucket.com/albums/c1...ating_pump.jpg
...if I bought a new pump, would I just be able to take it apart and clamp
the new induction bit onto the old impeller part?

Daft idea, imho.
Old pump, worn bearings, worn impeller, dubious interchangeability,
invalidate the guarantee on the new pump.

Just change it.

In message . com, Aidan
writes


On Nov 30, 9:56 pm, "Jonathan" wrote:
...http://i27.photobucket.com/albums/c1...ating_pump.jpg
...if I bought a new pump, would I just be able to take it apart and clamp
the new induction bit onto the old impeller part?

Daft idea, imho.
Old pump, worn bearings, worn impeller, dubious interchangeability,
invalidate the guarantee on the new pump.

The head of the pump comes easily off the base (four allen screws)

The whole "active" part of the pump can just be swapped over

--
geoff

On Sat, 02 Dec 2006 02:25:34 -0800, Aidan wrote:

On Nov 30, 9:56 pm, "Jonathan" wrote:
...http://i27.photobucket.com/albums/c1...ating_pump.jpg
...if I bought a new pump, would I just be able to take it apart and clamp
the new induction bit onto the old impeller part?

Daft idea, imho.
Old pump, worn bearings, worn impeller, dubious interchangeability,
invalidate the guarantee on the new pump.

The worst case is a (partial?) drain down and remove the pump complete
with the isolators.




--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html
Gas Fitting Standards Docs he http://www.makewrite.demon.co.uk/GasFittingStandards

On Sat, 02 Dec 2006 19:43:35 +0000, raden wrote:

The head of the pump comes easily off the base (four allen screws)

The whole "active" part of the pump can just be swapped over

You're showing your (lack of) age, you young whippersnapper ;-)

Old Testament CH circulators had the induction coil in the cylindrical
head, a thin but watertight stainless steel plate across the part of the
body that the head bolts on to, and the rotor/impeller in the body.

I must admit that the first time I had to replace a modern pump I thought
I could just whip the head off like on Ye Olde Ones without draining the
system, with disastrous results :-(

"raden" wrote in message
...
In message . com, Aidan
writes


On Nov 30, 9:56 pm, "Jonathan" wrote:
...http://i27.photobucket.com/albums/c1...ating_pump.jpg
...if I bought a new pump, would I just be able to take it apart and
clamp
the new induction bit onto the old impeller part?

Daft idea, imho.
Old pump, worn bearings, worn impeller, dubious interchangeability,
invalidate the guarantee on the new pump.

The head of the pump comes easily off the base (four allen screws)

The whole "active" part of the pump can just be swapped over

Maxie, and this plantpot gives advice as if he knows about things. Amazing
eh Maxie. Amazing indeed.