[TheForge] heavy metal math/c frame press

Wed Nov 26 08:30:00 2003

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>. =20

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 =20
> steam.
> Gases can be compressed and can carry a lot of energy.  Water cutting=20
> 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=20
world. I worked on one that could maintain 5000 psig through a blown=20
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=20
big-ass Vickers Angle-Head pumps. (Pumped out about 50 gallons of oil=20
before the automatic cutouts functioned.) I wouldn't have wanted to be=20
in that pump room, close to that joint, when it blew.

That was the lower -powered, lower-pressure, system in that plant. The=20
big stuff maxed at just under 10,000 psig with comparable flow.=20