Topics

Density of coal


Dave Nelson
 

I’m working on a problem involving the density of coal and need some help.  Does anyone have a wheel report containing cars loaded with coal that have the weight recorded?  What is the car and weight listed?  The wheel reports I have do not include car weight.

 

I’m asking because well documented coal densities you can find on the web are all densities based on ground coal (think ground coffee) which is done specifically because rail shipped coal, being larger, has substantial air gaps that lessen the overall density of the load.

 

IOW the published numbers are going to be higher than the same cubic volume found in any hopper.  I’m looking for the later number.

 

T.I.A.

 

Dave Nelson


Andy Cich
 

In Karig’s Coal Cars book, there is a table of coal bulk densities by region on Page 2. 54 to 59 lb/cu ft is roughly the range for anthracite. For bituminous, the range is about 46 – 54 lb/cu ft.

 

The ARA used 52 lb/ cu ft when designing standard cars.

 

Andy Cich

 

From: main@RealSTMFC.groups.io <main@RealSTMFC.groups.io> On Behalf Of Dave Nelson
Sent: Wednesday, April 15, 2020 2:17 PM
To: STMFC <RealSTMFC@groups.io>
Subject: [RealSTMFC] Density of coal

 

I’m working on a problem involving the density of coal and need some help.  Does anyone have a wheel report containing cars loaded with coal that have the weight recorded?  What is the car and weight listed?  The wheel reports I have do not include car weight.

 

I’m asking because well documented coal densities you can find on the web are all densities based on ground coal (think ground coffee) which is done specifically because rail shipped coal, being larger, has substantial air gaps that lessen the overall density of the load.

 

IOW the published numbers are going to be higher than the same cubic volume found in any hopper.  I’m looking for the later number.

 

T.I.A.

 

Dave Nelson


David Soderblom
 

A lot of coal was shipped fairly finely divided, in small pieces, large chunks with air gaps less so.  A reference book I have quotes the density of coal as 75 to 94 lbs/ft^3, so you could use the lower number.



David Soderblom
Baltimore MD USA






Andy Laurent
 

Dave,

Give the attached Green Bay & Western conductor's train book from 1945 a try. It is from my collection.  Lots of coal in there, much of it going westbound from Green Bay (station 0) to the paper mills in Wisconsin Rapids (station 96). Some of it in boxcars. Most of the trains in there are mainline GB&W freights.

Andy Laurent
Madison, WI


al.kresse <water.kresse@...>
 

Yes, you want bulk density . . . . different for lump, stoker or pea sized coal. Then you need the heaping rules for different railroads.  N&WVGN used 15" and C&O 10" max.

Al Kresse

On April 15, 2020 at 4:22 PM Andy Cich <ajc5150@...> wrote:
of dif

 to 59 lb/cu ft is roughly the range for anthracite. For bituminous, the range is about 46 – 54 lb/cu ft.

 

The ARA used 52 lb/ cu ft when designing standard cars.

 

Andy Cich

 

From: main@RealSTMFC.groups.io <main@RealSTMFC.groups.io> On Behalf Of Dave Nelson
Sent: Wednesday, April 15, 2020 2:17 PM
To: STMFC <RealSTMFC@groups.io>
Subject: [RealSTMFC] Density of coal

 

I’m working on a problem involving the density of coal and need some help.  Does anyone have a wheel report containing cars loaded with coal that have the weight recorded?  What is the car and weight listed?  The wheel reports I have do not include car weight.

 

I’m asking because well documented coal densities you can find on the web are all densities based on ground coal (think ground coffee) which is done specifically because rail shipped coal, being larger, has substantial air gaps that lessen the overall density of the load.

 

IOW the published numbers are going to be higher than the same cubic volume found in any hopper.  I’m looking for the later number.

 

T.I.A.

 

Dave Nelson