[TheForge] heavy metal math/c frame press ERRATA

[John Husvar]

Grover Richardson wrote:
> -----Original Message-----
> From: theforge-admin@mailman.qth.net [mailto:theforge-admin@mailman.qth.net]
> On Behalf Of John Husvar
> Sent: Wednesday, November 26, 2003 10:22 AM
> To: theforge@mailman.qth.net
> Subject: Re: [TheForge] heavy metal math/c frame press ERRATA
> 
> John Husvar wrote: 
> 
>>Not enough info, but if you're talking about two 50 HP compressors'
>>output into 24" diameter pipe of much length -- could be a big Oops!
>>KaBOOM! :)
> 
> 
> Blowers.  Radial axis fans as I remember.  I've got to go back out there
> today, will look.

You mean those big ones that resemble screws? Like an axial screw 
compressor, but looser, or the vane type that work radially?

Those things _are_ a cross between a fan and a compressor. Very similar, 
only difference is in degree. :)

> 
> 
>>If not compressors, what kind of blowers? Usually fans or squirrelcage
>>blowers will just stop moving air when the pressures on both sides 
>>equalize. Seems like they'd equalize way before reaching the yield point 
>>of the pipe material.`
> 
> 
> Air has mass<G>.  Every fireman will tell you horror stories of someone who
> turned off the fire hydrant too fast<G>.  Air has less mass than water, but
> when flowing quickly, gosh<G>.

Oh yeah. I remember being on the way back to the hotel from a job in MA 
during Hurricane Gloria. Almost didn't make it off the machines and into 
the car and to the hotel. Blew the roof off the hotel across the street. 
Saw it siting on half a dozen Fords, a Dodge, and a BMW. :)

> 
> I mean when the pressure in the pipe exceeds the fan's air moving 
> ability. Still seems that'd occur way before the pressure in the pipe 
> reached yield.
> 
> IMHO, the pipes were insufficient for the pressure, but I haven't looked
> deeply into it. Someone else did, after the failure.

I'd be interested in their determination, just for the curiosity of it..

> 
> Just curious, not arguing.
> 
> Understand, no argument felt on this end<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>.
>>>
>>
>>I've heard of that, but thought it might be an urban legend. Guess not. :)
> 
> 
> Got pictures, I was on the phone, it spun up, made fluttering sounds, then
> WHAM.  I still haven't found the front cover of the little tray that slides
> in and out.  CD just disentigrated.

I'll keep that in mind. Sunds like one of those things that have small 
odds but large consequences if the odds don't go your way.:)

> 
> All the best. 

To you too.



-- 
Life is not a journey to the grave with the intention of
arriving safely in one pretty and well-preserved piece.
One should rather skid in broadside, thoroughly used up,
totally worn out, and loudly proclaiming -- "WOW!  WHAT A RIDE!"