Re: [PSUBS-MAILIST] enquiry - Propulsion

["Dan H." <JMachine@adelphia.net>]

I don't have the supplier at my finger tips but will get it for you.  When I
was talking to their factory engineer he told me that the way they work is,
that they do actually get hot on their contact surfaces, although not really
detectable to the observer.  The contact surfaces are precision finished and
must be free from the slightest bit of oil.  The few molecules of water that
try to get in-between the two rotating surfaces is actually evaporated off
by the friction of the seal.

Kittredge subs used them in all their thrusters and had never had a problem.
Their a common rotary pump seal but a bit pricey.

Dan H.
----- Original Message -----
From: "steve" <steve@kobol.worldonline.co.uk>
To: <personal_submersibles@psubs.org>
Sent: Thursday, September 18, 2003 3:39 PM
Subject: Re: [PSUBS-MAILIST] enquiry - Propulsion


> Hi Dan
>
> i haven't tried carbon ceramic seals, my experimental thruster uses a
viton
> rotary shaft seal.
> i started with a nitrile seal but even at low revs i found the friction
> started to melt the seal, the viton seal is harder wearing but i find that
> the shaft movement and the pressure lets some water in so i was looking at
> other ideas.
>
> Do you know of a supplier where i could get these seals from.
>
>
> Steve Bosworth
> UK
>
>
> ----- Original Message -----
> From: "Dan H." <JMachine@adelphia.net>
> To: <personal_submersibles@psubs.org>
> Sent: Thursday, September 18, 2003 12:43 PM
> Subject: Re: [PSUBS-MAILIST] enquiry - Propulsion
>
>
> > Steve,
> >
> > Have you tried carbon ceramic face seals that are used in rotary water
> > pumps.  They have a spring loaded carbon face that mates to a stationary
> > ceramic face and will work well even under considerable pressure.
> >
> > Dan H.
> >
> > ----- Original Message -----
> > From: "steve" <steve@kobol.worldonline.co.uk>
> > To: <personal_submersibles@psubs.org>
> > Sent: Wednesday, September 17, 2003 7:56 PM
> > Subject: [PSUBS-MAILIST] enquiry - Propulsion
> >
> >
> > > Hi All
> > >
> > > i have a question regarding propulsion but not for surface travel.
> > >
> > > I am trying to research (small ROV size) thrusters with a magnetically
> > > coupled shaft but am not able to find much on the subject.
> > >
> > > my own design thrusters are ok but i am having to look at filling them
> > with
> > > oil to maintain the sealing.
> > > i would like to do some experimenting and was wondering, is there
anyone
> > on
> > > the list who has built such a device or can point me in the right
> > direction?
> > >
> > > any ideas would be appreciated
> > >
> > > Steve Bosworth
> > > UK
> > >
> > >
> >
> >
>
>