5 replies to this topic

[loggrrr]

I'm looking for the temperature correction factor chart for propane in degrees fahrenheit. I load LPG trailers. Given DOT regulations, we can only load to 80,000 pounds. Given propane's properties, the product temperature has to be corrected to figure safe loading percentages to accurately calculate product weight. I had the chart somewhere and lost it. The only one I've been able to find is in celcius which doesn't help me much

[Bobby Strain]

Just convert Fahrenheit to Celsius.

 

Bobby

[breizh]

Hi,

Will it help?

https://diversifiedc...ng-Tankcars.pdf

 

Note: I believe Bobby is spot on.

Breizh 

[loggrrr]

While you're both correct, the chart I'm referring to, is down to decimal places per single degree temperature difference. I would wind up distorting the accuracy in the conversion. I would need to employ a spreadsheet or something and I'm not that technically advanced. The chart does exist. I had one. I just need to find it again

[loggrrr]

Page 4 and 5 of the pdf is similar. The chart i used to have didn't account for specific gravity. All I have to go on is product temperature. I can't get specific gravity until after I load and the BOL prints. Most loading is done without supervision and facility operators if present, aren't generally sophisticated enough to grasp the concepts discussed here

[breizh]

Hi,

This means you have all the tools (tables) to perform the correction, as I supposed.

If I understand well, the reference for propane is 505 kg/m3 at 15C (59F), this means you can apply this correction factor using the second column of the table for the average temperature recorded during unloading .

 

another document based on temperature in Celsius:

https://www.ic.gc.ca..._Propane505.pdf

note: You should consider to invest in a metering station equipped with a mass flowmeter and totalizer to get all the data for reconciliation (mass, density, temperature) 

Cheers.

Breizh