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LIQUEFIED NATURAL GAS GOST 57431-2017

COMPONENT SUBSTANCE 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 Mol %
Pentanes and heavier not more than 0.25 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 microns 20.0 ppm (w)
ii. For 2 micron < d < 10 microns 1.50 ppm (w)
iii. For particle size greater than 10 microns 0.30 ppm (w)
(c) Liquid contents Nil
(d) Moisture 112 kg/million SCM
Hydrogen content 1.00 % (by volume)
Acetylene (C2H2) 0.10 % (by volume)
Higher Hydrocarbons for n>=3 10.0 % (by volume)
11 Residue on Evaporation vol % ASTM D-2158 0.0 max
 
                                                                                SPECIFICATION (Propane)
  PROPERTY UNITS TEST METHOD VALUE
1 Ethane mol % G.C 0.4 max
2 Propane mol % G.C 98 max
3 Butane mol % G.C 1.4 max
4 Pentanes & Heavier mol % G.C 0.01 max
5 Copper Corrosion - ASTM D-1838 No 1a max
6 Hydrogen Sulfide vol.ppm ASTM D-2420 / DRAGER  5 max
7 Sp. Gr. @ (60°F / 60°F) - ASTM D-2598 To be reported
8 Sulphur (Volatile) wt.ppm (Based on ASTM D-3246) 30 max
9 Vapor Pressure @ (100°F) Psig ASTM D-2598 200 max
10 Water Content - ASTM D-2713 Pass

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