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Specific Gravity of LNG

by nikcosmo
Tags: gravity, specific
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nikcosmo
#1
Dec14-09, 08:12 PM
P: 2
Hi Everyone...

I'm trying to calculate the specific gravity of a sample of LNG using a compostion certificate and temperature and pressure variables of 5 bar at -134 deg C saturated. Its do perform a check for the value used to calculate how much is charged per litre by converting density to litres. The density should be around 0.4 kg/m^3 but i cant seem to get a close answer to that using the ideal gas equation, pv = nrt.

Infor on composition certificate;
Gas composition;
Nitrogen ; 1.18%
Methane; 96.66%

Gas density at 15 deg C = 0.699 k/m^3
Ave MW = 16.487 g/mol

Can someone please help? thanks.
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Borek
#2
Dec15-09, 02:38 AM
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P: 23,599
pV=nRT is and ideal GAS equation, LNG is a LIQUEFIED natural gas. You can't use theory that describes gaseous state to liquid state.

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nikcosmo
#3
Dec15-09, 04:58 AM
P: 2
Any suggestions to which way i should approach it then? cheers.

Borek
#4
Dec15-09, 05:03 AM
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P: 23,599
Specific Gravity of LNG

Only approach I can think of is to find density tables for LNG, engineering handbooks should have these. There are no theoretical equations that would allow calculation of density of a liquid (and even when such equations exist, they make heavy use of experimentally determined coefficients - so we are back to the handbook and tables).

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