Products & Services

Calibration Gas Standards for Petrochemicals and Refinery

CSL offers a complete line of gas calibration standards from a single source which allows its customers to save time and money by consolidating vendors and centralizing responsibility.

CSL offers certified gas standards which provides the ultimate in accuracy and traceability for the most demanding analytical applications, such as process analyzers in refineries and petrochemicals.

These multi-component gas mixtures which are a part of wide range of specialty gases are available in a wide range of concentrations upto ppb levels. They come with a certificate of analysis from CSL’s Mumbai facility. Method of preparation follows the ISO 6142 and method of analysis follows the ISO 6143. This certification confirms their suitability for demanding applications which require the highest levels of accuracy.

  • Excellent lead times
  • Prepared by high precision gravimetry
  • Verified analytically by traceable comparison methods
  • Fully compliant with ISO 6142 – Part 1 and ISO 6143
Below is the detailed description of our blends with tolerance and certification accuracy
Sr. No. Product Grade Concentration Values Blend Tolerance or Preparation Tolerance Blend Accuracy
1 Certified Below 5 ppm ± 15-20% ± 2-5%
2 5-100 ppm ± 10% ± 2%
3 101-5000 ppm ± 10% ± 2%
4 Above 0.5% ± 5% ± 2%
5 Gravimetric 0-100 ppm ± 20% Non-Certified by independent laboratory analysis. Concentration ranges are reported based on the gravimetric values.
6 101-5000 ppm ±10%
7 Above 0.5% ±5%


Available Cylinder Capacities and Material of Construction (MOC)

Sr. No. Cylinder Water Capacity (Liters) MOC Maximum Working Pressure (Bar) Gas Volume @ Max Working Pressure (m3) Suitable Applications Cylinder Valves
1 50 Carbon Steel 200 10 Non reactive gases All types of CGA, BS4 & DIN valves can be supplied. 
2 47 Carbon Steel 150 7 Non reactive gases
3 35 Aluminum 150 5 Toxic & reactive
4 20 Aluminum 150 3 Toxic & reactive
5 10 Aluminum 150 1.5 Toxic & reactive
6 10 Carbon Steel 150 1.5 Non reactive
7 3 Carbon Steel 150  0.45  Non reactive
8 3 Aluminum 150  0.45  Reactive
9 1.6 Aluminum 90  0.112 Toxic & reactive Available with C10 valve only 
10 1 Aluminum 35 0.035 Toxic & reactive
11 0.5 Aluminum 120 0.06 All types of gases
Note: Actual filling pressure will always be lesser than max working pressures 


Refinery Lab Calibration Gas Standards

The following shows some of the common calibration gas standards available from CSL.

Please inquire for product availability if your calibration gas or specialty gas requirements are not shown below.


SULFUR SPECIES - CALIBRATION GAS STANDARDS
  • Fuel Gas Plants (method 11 Hydrogen Sulfide mixtures)
  • Miscellaneous (PPB & PPM Hydrogen Sulfide, Carbonyl Sulfide, Sulfur Dioxide, Methyl Mercaptan, Ethyl Mercaptan, Thiophene, Carbon Disulfide & Dimethyl Disulfide)

Components Concentration (ppm mol/mol)  Accuracy
Hydrogen sulphide  0.2 to 200  ± 2 to ± 10 % 
Carbonyl sulphide  0.2 to 200  ± 2 to ± 10 % 
Carbon disulphide  0.2 to 200  ± 2 to ± 10 % 
Methanethiol (methyl mercaptan)  0.2 to 200  ± 2 to ± 10 % 
Ethanethiol (ethyl mercaptan)  0.2 to 200  ± 2 to ± 10 % 
Dimethyl sulphide  0.2 to 200  ± 2 to ± 10 % 
1-propanethiol (n-propyl mercaptan)  0.2 to 200  ± 2 to ± 10 % 
2-propanethiol (iso-propyl mercaptan)  0.2 to 200  ± 2 to ± 10 % 
Ethyl methyl sulphide (methyl ethyl sulphide)  0.2 to 200  ± 2 to ± 10 % 
1-butanethiol (n-butyl mercaptan)  0.2 to 200  ± 2 to ± 10 % 
2-methyl-2-propanethiol (tert-butyl mercaptan)  0.2 to 200  ± 2 to ± 10 % 
2-methyl-1-propanethiol (iso-butyl mercaptan)  0.2 to 200  ± 2 to ± 10 % 
1-methyl-1-propanethiol (sec-butyl mercaptan)  0.2 to 200  ± 2 to ± 10 % 
diethyl sulphide  0.2 to 200  ± 2 to ± 10 % 
n-hexyl mercaptan  0.2 to 200  ± 2 to ± 10 % 
tetrahydrothiophene (THT)  0.2 to 200  ± 2 to ± 10 % 
Nitrogen or Helium or Methane (HC)  Balance  ± 0.5% 

Natural Gas Standards

Natural gas composition varies from source to source and often varies on a daily and seasonal basis. Using a calibration gas that is specifically designed for your application ensures that you will continue to achieve the best possible gas quality measurements. CSL’s experienced staff posses over twenty years of experience in gas industry to design calibration gases to suit each customer’s specific requirements.


Various compositions are as follows


Components Con
(% mol/mol)
Amount fraction
(% mol/mol)
Amount fraction
(% mol/mol unless stated as ppm)
Amount fraction
(% mol/mol unless stated as ppm)
Nitrogen 0.02 to 25 ± 0.5 % to ± 1 % 0.1 to 22 ± 0.5 % to ± 1 %
Carbon Dioxide 0.05 to 25 ± 0.5 % to ± 1 % 0.05 to 15 ± 0.5 % to ± 1 %
Methane 34 to 100 ± 0.5 % to ± 1 % 34 to 100 ± 0.5 % to ± 1 %
Ethane 0.1 to 35 ± 0.5 % to ± 1 % 0.1 to 35 ± 0.5 % to ± 1 %
Propane 0.05 to 20 ± 0.5 % to ± 1 % 0.05 to 15 ± 0.5 % to ± 1 %
iso-Butane 0.01 to 2 ± 0.5 % to ± 1 % 0.01 to 0.15 ± 0.5 % to ± 1 %
n-Butane 0.01 to 2 ± 0.5 % to ± 1 % 0.01 to 0.15 ± 0.5 % to ± 1 %
neo-Pentane 0.001 to 0.5 ± 0.5 % to ± 1 % 0.002 to 0.35 ± 0.5 % to ± 1 %
iso-Pentane 0.002 to 0.6 ± 0.5 % to ± 1 % 0.005 to 0.35 ± 0.5 % to ± 1 %
n-Pentane 0.002 to 0.6 ± 0.5 % to ± 1 % 0.005 to 0.35 ± 0.5 % to ± 1 %
n-Hexane 0.001 to 0.5 ± 0.5 % to ± 1 % 0.001 to 0.35 ± 0.5 % to ± 1 %
2-Methylpentane 0.001 to 0.35 ± 0.5 % to ± 1 % 0.001 to 0.35 ± 0.5 % to ± 1 %
3-Methylpentane 0.001 to 0.35 ± 0.5 % to ± 1 % 0.001 to 0.35 ± 0.5 % to ± 1 %
2,2-dimethylbutane 0.001 to 0.35 ± 0.5 % to ± 1 % 0.001 to 0.35 ± 0.5 % to ± 1 %
Benzene 0.001 to 0.2 ± 0.5 % to ± 1 % 0.001 to 0.2 ± 0.5 % to ± 1 %
Cyclohexane 0.001 to 0.2 ± 0.5 % to ± 1 % 0.001 to 0.2 ± 0.5 % to ± 1 %
n-Heptane 0.001 to 0.2 ± 0.5 % to ± 1 % 0.001 to 0.2 ± 0.5 % to ± 1 %
Toluene 0.001 to 0.1 ± 0.5 % to ± 1 % 0.001 to 0.1 ± 0.5 % to ± 1 %
Methylcyclohexane 0.001 to 0.1 ± 0.5 % to ± 1 % 0.001 to 0.1 ± 0.5 % to ± 1 %
n-Octane 0.0005 to 0.05 ± 0.5 % to ± 1 % 0.0005 to 0.05 ± 0.5 % to ± 1 %
n-Nonane 0.0001 to 0.02 ± 0.5 % to ± 1 % 0.0005 to 0.02 ± 0.5 % to ± 1 %
n-Decane 0.0001 to 0.005 ± 0.5 % to ± 1 % 0.0005 to 0.005 ± 0.5 % to ± 1 %
C6+ N/A   0.001 to 0.35  
Helium 0.005 to 0.2 ± 0.5 % to ± 1 % 0.005 to 0.2 ± 0.5 % to ± 1 %
Hydrogen 0.005 to 0.2 ± 0.5 % to ± 1 % 0.005 to 0.2 ± 0.5 % to ± 1 %
Oxygen/Argon N/A   5 ppm to 100 ppm  ± 1 % to ± 5 %

Maximising gas volume
Proposed designs will also maximise cylinder filling pressures, where appropriate, through gas liquid phase equilibrium calculations so you receive the highest gas volume possible within the required parameters.


Physical properties
Physical properties for all-natural gas and LNG calibration mixtures are included on certificates of calibration. These can be used for measurement confirmation as part of your quality control procedures and validation.

Physical properties of calorific value, relative density, real density, Wobbe index, mean molecular mass and compression factor are calculated from composition according to ISO 6976, GPA 2172 or ASTM D3588.


Calibration Gas Standards for Refinery Gas Analyzers (RGA)

Various Composition of refinery gas analyzer standards are as follows. Any other feasible combination can be supplied on request.


Component Calibration Gas-1
(Vol. %)
Calibration Gas-2
(Vol. %)
Calibration Gas-3
(Vol. %)
Calibration Gas-4
(Vol. %)
Calibration Gas-5
(Vol. %)
Calibration Gas-6
(Vol. %)
Carbon monoxide 1.00 2.00 0.00 5.00 15 0
Carbon dioxide 1.00 4.00 0.00 10.00 20 0
Hydrogen 3.00 5.00 4.00 10.00 0 0
Methane 2.00 4.50 1.50 47.00 0 20
Ethylene 2.50 7.00 0.50 1.00 0 0
Ethane 1.50 3.50 0.50 10.00 0 0
Propane 3.00 5.00 0.75 5.00 50 20
Propylene 6.00 15.00 2.50 2.00 0 40
Iso-butane 1.50 2.50 1.50 0.00 0 0
n- Butane 3.00 1.00 0.50 0.00 0 0
1-Butene 1.50 2.50 0.50 0.00 0 0
Iso-Butylene 1.50 2.50 0.70 0.00 0 0
Trans-2- Butene 1.50 2.00 0.70 0.00 0 0
Cis-2-Butene 1.50 2.00 0.50 0.00 0 0
1,3-Butadiene 1.00 2.00 0.05 0.00 0 0
2-Methyl-1-Butene 1.00 2.00 0.25 0.00 0 0
3-Methyl-1-Butene 0.00 0.00 0.10 0.00 0 0
2-Methyl-2-Butene 0.00 0.00 0.30 0.00 0 0
Iso-Pentane 1.50 2.50 1.00 0.00 0 0
n-Pentane 1.00 2.00 0.20 0.00 0 0
1-Pentene 0.00 0.00 0.20 0.00 0 0
Trans-2-Pentene 0.00 0.00 0.20 0.00 0 0
Cis-2-Pentene 0.00 0.00 0.10 0.00 0 0
n-Hexane 0.00 0.00 0.20 0.00 0 0
Nitrogen 65.00 33.00 83.25 10.00 15 20
Total 100.00 100.00 100.00 100.00 100.00 100.00

LPG GAS STANDARDS

Various combination of LPG gas standards are used to Calibrate the Gas Chromatography in refinery labs.


Sr. No. Components Concentration ranges vol or mol %
1 Methane 0.02 to 0.08
2 Ethane 0.05 to 5
3 Propane 30 to 60
4 Iso-Butane 15 to 30
5 N-Butane 15 to 30
6 Iso-Pentane 1 to 10
7 N-Pentane 1 to 10
8 Other C4s 0.5 to 2.5
9 Other C5s 0.5 to 2.5

Any other feasible combinations can be blended and supplied as per your requirements.


Methanizer Calibration Gas Standards

Calibration gas mix of ppm of CO, CO2 & Methane balance Hydrogen E.g. 5 ppm each of CO, CO2 & Methane in Hydrogen with Accuracy of ±3 % and stability of 24 months.


For Cylinder pressure regulators, click here


Petrochemicals/ Polymer Plant Calibration Gas Standards

CALIBRATION GAS & LIQUID STANDARDS FOR BUTENE/BUTADIENE/AROMATICS
  • Gas or liquid blends of C1/C2/C3C4/C5+ components like Methane, Ethane, Propane, Propylene, Ethane , Ethylene, Butanes, Pentanes, Acetylenes (Vinyl, Methyl, Ethyl, Propyl etc), 2-Butenes (Cis & trans), Pentenes
  • Liquid blends of BTEX, other aromatics & higher Alkanes (mol/mol , vol/vol & wt/wt)
  • Calibration gas and liquid blends for impurity profile in 1,3–Butadiene
  • Calibration gas and liquid blends for impurity profile in 1-Butene
  • Liquid blends for LPG (C1 to C6+)
  • Other customized liquid blends for Hydrocarbons
  • Other customized liquid blends for Sulphur in hydrocarbons available in Helium overpressure cylinder or constant pressure piston type sampling cylinders
    • Sulphur as Thiophene or Mercaptans in iso-Octane
    • Sulphur in Butanes
    • Sulphur in Propane
    • Sulphur in Ethylene/Propylene
  • Liquified LPG gas standard in constant pressure piston type sampling cylinders

Sr. No. Components Concentration ranges vol or mol %
1 Nitrogen 0.10 % Mol/Mol
2 n-Octane 0.50 % Mol/Mol
3 Carbon Dioxide 1.0% Mol/Mol
4 Methane 1.0 % Mol/Mol
5 n-Heptane 1.0 % Mol/Mol
6 iso-Pentane 3.0 % Mol/Mol
7 n-Hexane 3.0 % Mol/Mol
8 iso-Butane 4.0 % Mol/Mol
9 n-Pentane 4.0 % Mol/Mol
10 n-Butane 8.0 % Mol/Mol
11 Propane 25.00 % Mol/Mol
12 Ethane 49.40 % Mol/Mol

Please send your required composition or process stream, we will suggest or recommend the suitable & feasible calibration gas standards for your applications.


For Cylinder pressure regulators, click here