LNG Liquefied Natural Gas

Properties

Permissible limits

Gross Heating Value (GCV) range

9,340 – 10,420 Kcal/SCM

(1,050 – 1,170 BTU/SCF)

Methane

not less than 85.0 mol %

Ethane

not more than 9.2 mol%

Propane

not more than 3.00 mol %

Butanes and heavier

not more than 2.00 mom %

Pentanes and heavier

not more than 0.10 mol %

Nitrogen

1.0 molecular %

Total Sulphur

10.0 ppm (w)

Sulphur in form of Hydrogen Sulphide

10.0 ppm (w)

Maximum variation in Wobbe index (WI)

WI ­­– LHV (Volumetric Basis/(Specific Gravity w.r.t Air)0.5

+/- 5.0 %

Contaminants

(a)                                 Trace Metals

i.                                       Pb + Zn

0.50 ppm (w)

ii.                                      Na + K

0.30 ppm (w)

iii.                                     Vanadium

0.50 ppm (w)

iv.                                     Calcium

2.0 ppm (w)

v.                                      Magnesium

2.0 ppm (w)

vi.          Sum of heavy metals (Hg+V+PB+Zn+NI+Others

1.0 ppm (w)

(b)                                Solids/Particulates

        i.                     Total for particle size up to 10 micron

       ii.                         for  2 micron