"T i m" wrote in message
news
Hi All,

My mate with a greenhouse (well several g) showed me a small blue
metal bodied pump that us used to mix via a 'Computer' (not as we know
it) and solenoid valves, varying amounts of acid and alkali into the
alto watering mix for his 4,000 tomato plants ;-)

He showed me a sorry looking pump that he said cost 400 pounds new.

It's a 240V single phase jobby and about 140mm long by 80mm diameter
and uses an inductive coupling to drive the plastic impeller in the
plastic pump body (is that what they do in shower pumps?). From memory
the pump flow return had an inner bore of about 10mm.

I was wondering if anyone in an industry that might use such equipment
might know of what might make a 'cheap' (but reliable) replacement
maybe please?

He recently used up his last 'spare' as one (of the three in use)
seized solid. I'll be taking him some Plus Gas as he was trying WD40
on it (when will folk learn ?sigh)

All the best ..

T i m

Sounds like a magnetically coupled pump (magpump) with a sealed impellor
housing.
March May make a range of these pumps. I aven't found a web address but
this is their number - 01480) 214444 - they are in St Neots.
The most regular failure of these pumps is caused through running them dry,
this melts the seating of the impellor bearing.