The referenced youtube video misinterprets the trucks gauge (see the image at 0:43). It reads in inches of mercury, not psi. With the gauge designed so that atmospheric pressure is set to read

A vacuum gauge reading minus 27 is not reading pounds per square inch. It is reading inches of mercury that the vacuum can lift. Chuck Peck

Claus Schlund wrote: They pulled a higher vacuum with a vacuum truck. Those are usually used for sucking out clogged sewer pipes and the like and obviously exceed “full” vacuum (14.5 psig). I

 Hi Ed and List Members, That was subtle Ed, very subtle... What Ed is trying to say is that normal atmospheric pressure is about 14.7 PSI. Thus a PERFECT VACUUM would read at -14.7 PSI (note

"...the destructive power of a vacuum at -27psi." I used to run a three-stage vacuum pump, and I could never get it below approx -15 psi. Wonder what I was doing wrong. Ed Edward Sutorik

Exactly! Allen Cain

A friend who recently retired from supervising the Exxon tank fleet had a number of photos like that. https://www.youtube.com/watch?v=yBq5uapC-e0 Most were related to cleaning, not unloading. On

Here is a tank car vacuum collapse live. https://www.youtube.com/watch?v=VS6IckF1CM0 Chuck Peck

Fenton Wells wrote: Same to you and yours, Fenton, and to everyone on the list. Tony Thompson tony@...

I think whoever volunteered that was on point. Hope you and your family have a great Thanksgiving Fenton -- Fenton Wells 250 Frye Rd Pinehurst NC 28374 910-420-8106 srrfan1401@...

Fenton Wells wrote: I once showed this photo in a clinic, and someone in the audience said, "They're not repairing that puppy." Tony Thompson tony@...

Thanks Claus, What magnificent skies! Jerry Michels

Looks like one of my scratch building projects Fenton -- Fenton Wells 250 Frye Rd Pinehurst NC 28374 910-420-8106 srrfan1401@...

Allen Cain wrote: You mean like the one shown below? This one was steam cleaned and the manway closed with the tank hot. As it cooled and the pressure inside decreased, voila! Tony Thompson tony@...

I assume that the double door boxcar parallel to the NH is a Santa Fe because the doors do not match. Gary Laakso Northwest of Mike Brock

Thanks for pointing that out Steve. It’s an interesting clue. The Jan. 1953 ORER includes 151 cars, and not TT spells out which of those had the wider and narrower extreme width. I assume its an

Friends, Isn't it amazing what a red filter will do with clouds? Yours Aye, Garth Groff 🦆

Having worked unloading coal tar pitch tank cars I recall having to open the vent valve in the dome or else the car could literally collapse as the pitch was drained out of the bottom fitting, if it

Bob Chaparro wrote: As this is a PS-1 still displaying its "NEW" stencil, surely the "New Roof" notation must refer to the original roof?? Tony Thompson tony@...

Chuck, True for most kind of tank cars and cargoes, but not true for pressure tank cars and acid tank cars. They all required top unloading. For LPG, Ammonia, Chlorine, because they were gasses