gas cargo calculation exercise
TRANSCRIPT
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Gas Cargo Calculationexercise
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Cargo in tanks 2 Ps & Sb
Tanks are loaded with Propylene Soundings (ENRAF gauges)
Tank pressure: 2.60 barg
Patm: 995 mb
2Ps 2Sb
7352mm 7480mm
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Cargo tank temperatures
Ships data
Trim: 1.5 meters by the stern
List: 0.5 to Sb
2Ps 2Sb
-15.5 -16
-24.2 -24.7
-23.9 -23.8
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Height of the tank 10.50m (Ps & Sb)
100% capacity 1400.35 m3
each tank
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Calculation average liquid and
gas temperature
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Correction of soundings
Dip = Thermal Contraction or
expansion of the measuring tape
Float = Correction for change in float
immersion for different densities
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Correction for trim & list
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Calculation actual volume &
mass in the liquid phase
Liquid volume x shrinking factor x
liquid density
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Calculation gas height &
Weighed average tanktemperature
Weighed average tank temperature =((liquid height x liquid temp.) + (gas
height x gas temp.))/Total height of the
tank.Used to obtain the shrinkage factor for the
complete tank
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Weighed Av.temp. Ps: ((7412mm x -
24.05C) + (3088mm x -15.5))/10500 = -
21.53
Weighed Av.temp. Sb: ((7543mm x -
24.25C) + (2937mm x -16.0))/10500 = -
21.89
(-21.53 -21.89)/2 = - 21.71
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Calculation of the gas density
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Final result
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