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[coolbumble]

I have recently purchased from eBay a microcosm electric water pump to feed my boiler.
The fittings on the pump are not an olive and threaded fitting ! Has anyone experience of fitting and running this pump advice would be welcome.
Regards
Ian 

[rhavrane]

Bonjour Ian,


I have several electric (or not, it does not change anything) coupled water pumps and they look like yours. Major difference, they all have thread. I would suggest that the seller, as he does not know if the buyer will use metric or US/GB measures, let you choose your own tools.
The two slick parts look thick enough to let you do the job by yourself, don't they ?
Of course, I let specialists agree or not with me.

[coolbumble]

Many thanks for that observation which is interesting. However the guy also sells a hand operated water pump that has threaded ends  Obviously I shall have to convert the one going to the boiler unless anyone else has any idea's Thank you
Regards
Ian 

[coolbumble]

I've ordered a 1/4 x 40 TPI die so trust my problem will be resolved I have the olives and threaded cups.
Thanks for the info 

[Jerry C]

Will the pipe not solder straight into the banjo?
Jerry.

[derekwarner]

Ian......I have two of these pumps...one is paddle shaft driven [to 150 RPM?] and the second as a 12 Vdc auxiliary at 70 RPM with an Australian sourced electric motor

The banjo nipples were to suit M3 diameter tube.....but with adequate wall thickness were drilled to suit 1/8" OD tube short spools for soft soldering
I have also replaced the banjo body Nylon sealing washers with RED fibre as the Nylon seemed to be ever extruding even with light tightening of the banjo barrel bolt

The same nipples whilst being screwed M3, for integrity were also soft soldered into the banjo body

The lubrication well in the pumps eccentric ring seemed rather small, so I soldered/added a casing similar in size to the engine journal wells

I have not commissioned either pump yet..... waiting for the onboard suction water tank supply ..... Derek

 

[coolbumble]

Hi Derek,
Many thanks for your reply and the many picture which are so helpful. Looks like you have a great system there.
On what you have said and shown plus the remark from Jerry soldering is / and the simplest answer. I shall take on board your suggestion of red fibre washers also the extra lubrication .
My regards
Ian 

[coolbumble]

Hi all,
One more question if you can advise me what batteries do you use and how long do they last ?  I haven't a lot of room and was thinking of a 11.1 volt 2200mah lipo. Obviously I depends on different set ups times of running etc. but some info would be very helpful . I have a three and a half inch Maccsteam vertical boiler and a twin Clyde engine.
Regards
Ian 

[derekwarner]

Ian....possibly the easy plan would be 

1. fill the boiler with cold water...bleed out all of the air...shake the boiler to ensure any entrapped pocket of air is vented to atmosphere
2. connect the pump to one of those "elchepo" multi voltage DC supplies [2, 3.5, 4, 6, 7.5  9, 12 volt]
3. pressurise the water in the boiler until the steam relief valve acts as a water relief valve....you will not damage it
4. you can then monitor the motor current draw [amps] with a multimeter whilst pumping at the relief valve setting
5. from this you can do your own sums

Remember, being a positive displacement pump...the displaced volume will remain constant [in theory  ], ........as the boiler pressure increases so will the current draw

Keep us posted with the results ...........Derek

[Bernhard]

here is mine,,

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