HO Tank Car Lid
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Allen Cain
The picture of the Warren Tank Car being filled inspired me to model a car being filled.
Does anyone offer an HO tank car top with a lid that opens to model a car being filled? Probably not using the right terms but you get my meaning I hope. Would be interested in one for either gas, oil, propane or acid tank cars. Thanks, Allen Cain
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Todd Sullivan
Allen,
You should be able to saw the 'lid' off an Athearn 'chemical' tank car (cheap donor) and add it to an Atlas 11,000 gallon pressure tank car model. If you have one of those super thin modeling saws, you could probably just cut the top off the Atlas model's manway (dome) and glue it back on in the open position. I know of no HO tank car that has an operating hinged lid. Todd Sullivan.
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Inside the hinged top are the control valves for loading and unloading. The hose connections enter that casing through holes in the side of the casing to connect with the valves there. Note that there are two connections required to properly empty the car. See this interesting photo
Steve Hile
From: main@RealSTMFC.groups.io [mailto:main@RealSTMFC.groups.io] On Behalf Of Allen Cain
The picture of the Warren Tank Car being filled inspired me to model a car being filled.
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One might keep in mind that many products would never have the manway hatch opened except for cleaning. Most liquid products can be loaded and unloaded through pipes and hoses attached to access valves. An open hatchway is a potential source of contamination. Chuck Peck
On Mon, Nov 23, 2020 at 11:39 AM Todd Sullivan via groups.io <sullivant41=yahoo.com@groups.io> wrote: Allen,
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Tony Thompson
Todd Sullivan wrote: You should be able to saw the 'lid' off an Athearn 'chemical' tank car (cheap donor) and add it to an Atlas 11,000 gallon pressure tank car model. If you have one of those super thin modeling saws, you could probably just cut the top off the Atlas model's manway (dome) and glue it back on in the open position. I know of no HO tank car that has an operating hinged lid. Better try and use the Atlas over. I don't think you can mix the two. The Athearn one is considerably oversize, while the Atlas valve bonnet is scale size. Tony Thompson
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Tony Thompson
Charles Peck wrote:
It's not a manway on a pressure car. The cover is opened for access to the valves and hose connections. But on non-pressure cars, the manway cover IS opened for loading, and opened for unloading to access the valve wheel, or for top unloading. Tony Thompson
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Tony Thompson
If you're interested in the loading or unloading process for high-pressure tank cars, I have written a blog post about that, including a bunch of prototype photos. If you're interested, the link is below.
Tony Thompson
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Jeff Coleman
Tony Excellent blog on pressure cars. Only thing I'd add is the valve arrangement varies per commodity. Jeff Coleman
On Mon, Nov 23, 2020, 1:39 PM Tony Thompson <tony@...> wrote:
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Todd Sullivan
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 shipped in liquid form under pressure, so the easy way to unload is to attach hoses to fittings in the dome/manway. For acids, the tanks did not have bottom outlets to prevent leaks and damage to the outlets. Think of cleaning up a derailment with super sulfuric or phosphoric acid gushing from a broken fitting. Todd Sullivan
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Allen Cain
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 would flow at all. Draining the car increases the "air" pocket volumn above the fluid creating a vacuum that increases as the liquid level drops putting stress on the car. PV=nRT As the volume (V) increases as the tank is emptied the pressure (P) must decrease proportionally creating a vacuum to balance the equation. This can and has collapsed many storage tanks. Not sure if a rail tank car is strong enough to avoid collapsing as a full tank is drained to empty? In the case of a pressured gas car, the risk of the positive pressure dropping into the negative range is low as the tank was pressurized prior to unloading. Yes, I am a nerd. Alen Cain
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Tony Thompson
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
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Looks like one of my scratch building projects Fenton
On Mon, Nov 23, 2020 at 3:15 PM Tony Thompson <tony@...> wrote:
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Tony Thompson
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
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I think whoever volunteered that was on point. Hope you and your family have a great Thanksgiving Fenton
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Tony Thompson
Fenton Wells wrote:
Same to you and yours, Fenton, and to everyone on the list. Tony Thompson
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On Mon, Nov 23, 2020 at 4:11 PM O Fenton Wells <srrfan1401@...> wrote:
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Steve SANDIFER
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 of the funniest however was a line of tank cars with modern lock-tight couplers. One of the cars was missing a truck. Somewhere on the trip the truck derailed and left the track but the tank car stayed coupled to cars on both ends and finished the trip.
J. Stephen Sandifer
From: main@RealSTMFC.groups.io <main@RealSTMFC.groups.io> On Behalf Of Tony Thompson
Sent: Monday, November 23, 2020 2:16 PM To: main@RealSTMFC.groups.io Subject: Re: [RealSTMFC] HO Tank Car Lid
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!
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Allen Cain
Exactly! Allen Cain
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spsalso
"...the destructive power of a vacuum at -27psi."
toggle quoted messageShow quoted text
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
On Mon, Nov 23, 2020 at 01:14 PM, Charles Peck wrote:
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Claus Schlund \(HGM\)
toggle quoted messageShow quoted text
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 minus sign).
Therefore, a "vacuum at -27psi" is not possible under any circumstance
on earth
Claus Schlund
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