LNG: Is 300 Pounds of LNG = 55,500 BTU's?

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SUMMARY

The discussion centers on the energy content of liquefied natural gas (LNG), specifically questioning the claim that 300 pounds of LNG equates to 55,500 BTUs. The original poster challenges an engineer's assertion of 185 BTUs per pound, citing their own research indicating that one gallon of LNG can yield approximately 75,000 BTUs when burned. The confusion arises from the terminology used, particularly the reference to "standard empathy," which is likely a miscommunication for "enthalpy." Accurate understanding of LNG's energy content is critical for those involved in alternative fuels.

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  • Knowledge of thermodynamics, specifically enthalpy
  • Familiarity with BTU (British Thermal Unit) calculations
  • Basic principles of cryogenics and LNG storage
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  • Research LNG energy content calculations and conversions
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Engineers, alternative fuel researchers, and anyone involved in the energy sector looking to understand LNG properties and energy calculations.

sshim35563
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Hello I'm new to the forum. I was wondering if some people can help me in trying to get some answers.

I am involved in alternative fuels and it has come up where an engineer is telling me that there is 185btus/lb inside of a 100 gallon vehiculer tank. He is using a bueauro of standard empathy chart or something to get that number.

This confuses me because i don't understand how a cryogenic liquid that is about -200 F has that much btu's. in total, at a density of 3.0. There is 300 pounds of LNG and this =
55,500 btu's. Is this correct? From my research one gallon of LNG has the btu potential if burned of about 75,000 btu's.

I really think this engineer i am working with is blowing smoke up my butt, wondering if some people can shed some light on this.
 
Last edited:
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What is "standard empathy" supposed to be. Do you mean enthalpy? Have you never heard of enthalpy?
 

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