Approximate Energy conversion factors:

 

 

 

 

 

 

 

 

 

 

 

Approximate Energy conversion factors Table:

 

Selling to the Oil & Gas and Energy industry, requires to jump from natural gas to oil, from power to physical quantities: tons, barrels, cubic meters, from British to international standards…This table wants to be a hand while gauging a new or an old project, a prospective investment or the purchasing of a new equipment.

 

These factors are taken into account:

Oil barrels, BOED, Tons of Oil, TOE / day

LNG natural gas cubic meters, metric tons per day

Methane normal cubic meters Ncm, standard cubic feet scf, per day or per year

Heat equivalent Giga Joules, GJ, or British Thermal Units BTU

Power in Mega watts, MW or British Horse Power BHP

 

Note the 6 categories:

Power, Heat, Flow, Volume, Weight and Oil.

They should guide you.

 

Assumptions behind these figures:

The first is that we choose absolute value. For Natural Gas, e.g., we choose an HHV of 55.5 Mj/Kg.

This is theoretical. No pipeline will give you gas with such a purity. But then you can apply your corrective factors, your efficiency factors, and come to a conclusion. The second is that we did our bet, both in researching accurate values, and doing accurate calculations. But you use this table at your own risk. However, if you discover an error, we will be happy to know and thank you in advance. The third is the basic figures I used. They are listed in the second table at bottom page.

 

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Approximate Energy Conversion Factors Table - LNG Gas Oil | mmscfd cubicmeter per year | oil barrel | Mw | joule | BHP equivalent

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 Gas properties for Natural Gas components

Unit of Measure

Value

note

ncf/nmc

35,31

 

scf/nmc

37,33

 

cal/J

4,1868

 

j/btu

1055,056

 

t/b

7,3

API 33

BHP/Kw

0,7457

 

CH4 Mol weight

16,043

g/mol

R

8,31434

j/mol/K

CH4 HHV

55,500

 @ 15,4 °C MJ/kg

CH4 LHV

55,009

 @ 15,4 °C MJ/kg

molar volume CH4 (cm/mol)

0,022354315

 @ 0 °C , 101325 Pa

molar volume CH4 (cm/mol)

0,023593844

 @ 15 °C , 101325 Pa

density kg/ncm

0,71766905

 @ 0 °C , 101325 Pa

density kg/scm

0,6799655

 @ 15 °C , 101325 Pa

liquid density kg/cm

422,36

 @ 101325 Pa

mol/nmc

44,73409275

 

mol/scm

42,38393692

 

scm/ncm

1,05544921

measured

scm/ncm

1,057714421

pv=nrt

TOE

41,868

Gj

1 barrel

158,9873

liters

oil density

0,858

kg/liter @ 59 °F

oil density

7,335

barrels/metric ton

1 boe

5,8 * 10 ^6

Btu @ 59 °F - HHV

oil HHV

45,25

Mj/kg @59 °F

oil HHV

38,84

Mj/liter

oil LHV

42,98

Mj/kg @59 °F

oil LHV

36,89

Mj/liter

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Component

Mole Wt

Hydrogen Atoms

Carbon Atoms

Cp (1)

HHV (2)

LHV

Auto-ignition T (F) (3)

Flame Speed @ xx (in/s)(4)

0.60

0.80

1.00

1.20

1.40

H2

2.0159

2

0

3.4010

324.2

273.9

752

31.74

56.10

78.99

93.75

106.30

C1

16.0430

4

1

0.5266

1009.7

909.1

999

3.83

10.95

14.65

12.54

5.67

C2

30.0690

6

2

0.4080

1768.7

1617.8

959

4.49

11.12

15.91

16.32

10.40

C3

44.0960

8

3

.03887

2517.2

2315.9

871

5.36

11.48

15.53

15.42

9.51

IC4

58.1220

10

4

0.3867

3256.6

3001.0

864

6.34

12.58

17.39

18.04

13.67

NC4

58.1220

10

4

0.3951

3262.0

3010.5

761

5.03

10.50

14.44

13.89

7.87

IC5

72.1510

12

5

0.3829

3999.7

3697.9

788

 

From CompressorTech2
APRIL 2015, pg 76

NC5

72.1510

12

5

0.3880

4008.7

3706.8

496

C6

86.1780

14

6

0.3857

4756.1

4403.9

433

C7

100.2050

16

7

0.3842

5502.8

5100.3

433

C8

114.2320

18

8

0.3831

6248.9

5796.1

428

H2S

34.0760

2

0

0.2370

586.7

637.0

500

(1) Specific heat Cp at costant pressure conditions near atmospheric

(2) Heating values in BTU/scf at 14.696 psia, 60°F, and uncorrected for compressibility from GPA 2545-09

(3) Auto-ignitions temperatures from “Flammability Characteristics of Combustible Gases & Vapors”

(4) Laminar Flame Speed from University of Southern California Combustion Kinetics Laboratory

C1 methane

C2 ethane

C3propane

C4 isobutane - normal Butane

C5 isopentane

C6 hexane

C7 heptane

C8 octane

H2S hydrogen sulfide

H2 hydrogen