[TheForge] heavy metal math/c frame press

Wed Nov 26 09:31:04 2003

Argggg, just reading the first line below brings back memories of the army - as
some of you, I am sure, remember they gave shots (vaccinations) using compressed
air.
Jon

Grover Richardson wrote:

> Agreed.  But still, a stream of liquid (or gas) can cut you in half (under
> certain circumstances, and 10 ms of stream can still push oil under the
> skin).  Remember back when they did injections in the early 70s with
> pressure, no needle.  I'm not trying to be paranoid, however if someone is
> taking on a system with which full knowledge is not known (which may or may
> not be the case here), caution is advised.  I regularly get called to fix
> things with little or no documentation.  It gets interesting sometimes<G>.
>
> Oh, it's just a current sample of 100 MA, but they forget to mention that if
> the resistor breaks, then the full 35 kV is across the test equipment.  I
> saw that one coming, and the result of ALL the components blown off the
> circuit board, only little wires standing up, like a bad grass cut.
>
> I also have seen the result where they took schedule 80 2' diameter pipes,
> and piped the output of 2 50 hp blowers into one pipe, and then shut the
> pipe off<G>.
>
> We all can say, well that is just an isolated incident.  But then, as I
> remember, folks tend to put shields up on their little giants.  Seems that
> the isolated incidents of springs breaking is feared<G>.
>
> By the way, if you have a 48X or faster cd player in your computer, don't
> sit with your eyes level with the player.  I had a bad disc in mine, it
> broke while spinning, and exploded, literally, taking the front off the
> player in the computer.  I have pictures.  I did NOT see that one coming<G>.
>
> -----Original Message-----
> From: [email protected] [mailto:[email protected]]
> On Behalf Of John Husvar
> Sent: Tuesday, November 25, 2003 5:56 PM
> To: [email protected]
> Subject: Re: [TheForge] heavy metal math/c frame press
>
> [email protected] wrote:
> > Steam is a gas, not a liquid, even saturated or super saturated
> > steam.
> > Gases can be compressed and can carry a lot of energy.  Water cutting
> > jets are an entirely different animal, they have extremely high volume
> > high pressure pumps not really comporable at all to ordinary hydraulic
> > systems.
> >
>
> True, there are some pretty dangerous hydraulic systems out in the
> world. I worked on one that could maintain 5000 psig through a blown
> flange gasket on a 1-1/2 inch line, but (and it's a pretty big but) that
> system was driven by 4 (count 'em -- 4)  100 HP motors, driving 8
> big-ass Vickers Angle-Head pumps. (Pumped out about 50 gallons of oil
> before the automatic cutouts functioned.) I wouldn't have wanted to be
> in that pump room, close to that joint, when it blew.
>
> That was the lower -powered, lower-pressure, system in that plant. The
> big stuff maxed at just under 10,000 psig with comparable flow.
>
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