Dominion Cove Point LNG, LP

Original Volume No. 1

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Effective Date: 08/18/2003, Docket: RP01-217-003, Status: Effective

First Revised Sheet No. 236 First Revised Sheet No. 236 : Effective

Superseding: Original Sheet No. 236

GENERAL TERMS AND CONDITIONS

(Continued)

 

 

 

8. NATURAL GAS QUALITY (Continued)

 

(j) (v) c. Gas Heating Value, HV

 

HV = SUM [ (HHV(i) * (14.73/14.696) * x(i)) ] / Z

 

d. Gas Molecular Weight, MW

 

MW = SUM [ MW(i) * x(i) ]

 

e. Gas Specific Gravity, D

 

D = ( MW * 0.99949 ) / (Z * 28.9625)

 

f. Air Theoretically Required for Complete Combustion, A

 

A = SUM [ ST(i) * x(i) ] / 0.2095

 

g. Primary Air Factor, f

 

f = 1000 * SQRT (D) / HV

 

h. Air Theoretically Required for Complete Combustion per 100 Btu, a

 

a = A * 100 / HV

 

i. Ratio of the Number of Hydrogen Atoms in All Forms to the Number of

Carbon Atoms in Hydrocarbons, R

 

R = SUM [ H(i) * x(i) ] / SUM [ (C(i) * x(i) ]

 

j. Primary Aeration Index, JA

 

JA = [ { A(s) / A } * SQRT { D / D(s) } ]

 

No Subscript = adjustment gas

s = substitute gas

 

k. Mole Fraction of Oxygen in the Gas, Q

 

Q = x(i) for i = 9

 

l. Number of Carbon Atoms Easily Liberated by Combustion of 100 Molecules of

Gas, N

 

N = SUM [ ( C(i) - 1 ) * x(i) ] * 100 for i = 2 to 7

 

m. Weaver Flame Speed Factor, S

 

S = SUM [ ( x(i) * FS(i) ) ] / ( A + ( 5 * VI ) - ( 18.8 * Q ) + 1)

 

where: x(i) = Volumetric Fraction of Combustible Constituent of

Fuel Gas, for i = 1 to 7

 

FS(i) = Weaver Flame Speed Constant, for i = 1 to 7

 

n. Volumetric Fraction of Inert Gases (Nitrogen and Carbon

Dioxide), VI

 

VI = SUM [ x(i) ] for i = 8 and 10