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OIL BLENDING

  • By GSS Ops Team
  • |
  • 21 January 2019

Most of the oil traders or surveyors need from time to time to calculate required proportions for the blending of oil products to achieve required quality parameters and to calculate the price of the blend knowing the prices of components.

But what to do, if such quality parameters does not change linearly pro rata the volume or weight, such as pour point, cloud point, CFPP, freezing point, flash point, viscosity and others?

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OIL CALCULATIONS

  • By GSS Ops Team
  • |
  • 21 January 2019

From time to time everybody who needs to calculate oil quantities faces such problems as calculation in different units: either US customary units or in metric units.

Do you have software for oil calculations by ASTM D1250-08(2013) for calculation of CTL (the former VCF) for ship's and shore tanks or CTPL for LACT meters and API MPMS 11.5. (2009) which replaced Tables 11, 13, 52, 56, etc. with formulas?

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OIL TANK OR METER CALCULATOR

  • By GSS Ops Team
  • |
  • 21 January 2019

Not all the products can be attributed to the certain group of refined oil products. How to determine Alpha60 factor using test results for densities at different temperatures for the calculations by the Table 54C?

Our oil calculator can also calculate quantities in upright or horizontal cylindric shore tanks or based on LACT meter readings by Table 54A, B, C or D as per ASTM D1250-08(2013)...

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LPG CALCULATIONS

  • By GSS Ops Team
  • |
  • 21 January 2019

As you may already know the way quantity calculations of LPG drastically changed in 2007 in comparison to the method used for such calculations since 1952. Moreover, there are 2 ways of calculations in metric units and in US customary units. Do you know that the British Energy Institute issued in 2012 a new standard for calculations of shell correction for upright and horizontal cylindric, spheric or prismatic tanks?

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LPG BLENDING

  • By GSS Ops Team
  • |
  • 21 January 2019

Sometimes you need to calculate LPG quantity on board of LPG gas carrier during loading on top into ship's tanks. To take ship's samples after every next layer is too long procedure.

How to calculate the density of the liquid phase and the molar mass of vapour phase in ship's tanks after each loaded layer and to calculate corresponding quantity in interim ullages?

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LPG DENSITY CONVERTER

  • By GSS Ops Team
  • |
  • 21 January 2019

All chemists need to convert the measured liquid LPG density at observed temperature obtained by ASTM D1657 method into the density at 15˚C and / or to the relative density at 60/60˚F. Unfortunately the calculation routine by the Table 53E or 23E is too sophisticated to convert measured density manually.
Our LPG density converter can do this work for you automatically...

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LNG CALCULATIONS

  • By GSS Ops Team
  • |
  • 21 January 2019

As you may know, the Revised Klosek - Mc Kinley method for the LNG density is only applicable for the saturated pressure and within the following limits:              CH4 > 60% mol.
                          iC4 + nC4 < 4% mol.
                          N2 < 4% mol.
                          Temperature < 115 K.

But what to do, if actual pressure, temperature or composition happened to be beyond the limits?

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LNG LABORATORY CALCULATIONS

  • By GSS Ops Team
  • |
  • 21 January 2019

Every chemist testing LNG has to calculate the following quality parameters from the test results of gas composition:

Calorific Values of the ideal and real gas on molar base, on volumetric base or on mass base, the Wobbe Index, the Molar mass, the the density of the real gas of the vapour phase.
How to calculate all this and the liquid density at the tank temperature and pressure?

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CHEMICALS

  • By GSS Ops Team
  • |
  • 21 January 2019

There is such a big variety of different chemicals and sometimes there is no laboratory to carry out testing on densities and therefore there is no way to determine density correction factors per 1°С for quantity calculations.

Where to get such data and how to automate quantity calculations for chemicals based on density corrections factors per 1°С and on VCF for xylenes by ASTM D1555M?

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