- Temperature around 15 deg C, - Density Conversion for Petroleum Products from observed temperature to 15 C without use of ASTM Table (1980 series)

- Temperature around 15 deg C,    - Density Conversion for Petroleum Products from observed temperature to 15 C without use of  ASTM Table

List of all blog articles on Petroleum QC  by RJ Patel.

Lists of Android/iOs Apps developed on Petroleum Calculation - see here.    (These apps convert exactly as per ASTM tables 5a, 5b, 6a, 6b, 23a,23b, 24a,24b, 53a,53b, 54a,54b to standard temperature 15 C,  20 C and 60 F.)

One follower from Kiev, Ukraine  has requested the formula for the subject conversion.

The post gives a simple way to convert Density of petroleum products from ambient temperature  ( say 15 +/-7  deg C  )  to density at 15 Deg C, in line with ASTM table 53B,  without using these table and in the field with simple calculation.

See my earlier post dated 18 Dec 2016, for detail description of the procedure explained there.

For areas in Norther Europe,  Canada,  Russia,  China and southern hemisphere New Zealand,  Southern Australia etc  where winter temperature is  low, this method is useful.

A)   Simplified   Formula

          D₁₅ = d_o  +  C  x (   t_o – 15)

  Density at 15 deg c   = Density observed  + Constant x ( temp observed – 15 )
   Density unit is kg/m³

 Where  C is constant productwise as per following table :

Product	C  = Constant
Gasoline / NAPhtha	0.9
Kerosene/ATF	0.7
Diesel	07

B)  How to use formula manually without calculator

     

 Example : 1  Gasoline

       Density observed = 747.0  kg/m³

       Temp. observed   =  18 deg c

        ASTM table 53 B  = 749.7 kg/m³

      

Steps :   1)  find difference  (   t_o – T) manually ie.  3

              2)   multiply difference and constant  ie. 3 x 0.9 = 2.7         

              3) Add this product to step 1 ie.  747.0 + 2.7 = 749.7 kg/m³

Gasoline more examples :

Observed Density 756 at 10 deg C,   Density 15 C =751.5,  ASTM table =751.6 kg/m³

Observed Density 737 at 20 deg C,   Density 15 C =741.5, ASTM table =741.4 kg/m³

Example : 2.  Jet A-1 / Kerosene

                   Density observed = 790.0 kg/m³

                  Temp. observed   =  19 deg c

                   ASTM table 53 B  = 792.9 kg/m³

Steps      1)  find difference  (   t_o – T) manually ie.  4

               2)   multiply difference and constant  ie.  4 x 0.7 = 2.8        

               3) Add this product to step 1 ie.  790.0 + 2.8 = 792.8 kg/m³

Jet A-1 / Kerosene more examples :

Observed Density 802 at 12 deg C,  Density 15 C =799.9,  ASTM table =799.8 kg/m³

Observed Density 780 at 23 deg C,   Density 15 C =785.6,  ASTM table =786.0 kg/m³



Example : 3, Gasoil

                   Density observed = 835.0 kg/m³

                  Temp. observed   = 9 deg c

                  ASTM table 53 B  = 830.8 kg/m³

Steps :   1)  find difference  (   t_o – T) manually ie.  (-) 6 C

              2)   multiply difference and constant  ie.(-) 6 x 0.7 =(-)4.2         

              3) Add this product to step 1 ie.  835.0 - 4.2 = 830.8 kg/m³

Gasoil more examples :

Observed Density 842 at 18 deg C,   Density 15 C =844.1,  ASTM table =844.1 kg/m³

Observed Density 837 at 22 deg C,   Density 15 C =841.9,  ASTM table =841.8 kg/m³

The above is for ASTM Density Conversion tables of 1980 series.  Some industry still use old series tables ie ASTM 1952.

The equation given above was first developed in 1987 by author and since then extensively used for density conversion for pipeline, tanker and aviation tank truck   samples outside Laboratory/office where it is a bit inconvenient to take out ASTM table Book for density conversion.

The reader may please remember here that author's idea is to convert observed density to 15 deg C density in field with accuracy and simplicity.    Variation from ASTM 53B table is less than 0.4  kg/m³ which is equivalent to either half deg C or half unit of density while observing these readings in thermometer/hydrometers and same is affordable when taking density in field.   

RJ Patel Author's Profile     
      

List of all blog articles on Petroleum QC  by RJ Patel.
Visit to my blog https://rjpatelioc-petroleum.blogspot.com for similar other work related to Petroleum Product QC. Some of following links may be useful:

Density Conversion Apps to standard temp 15 / 20 deg C.

-Temperature around 3 deg C, - Density Conversion from observed temperature to 15 C without use of ASTM Table

- Jet A-1 Density conversion to 15 C from observed temperature without ASTM tables

 - Patel's Density Conversion for Petroleum Products from observed temperature to 15 C without use of  ASTM Table (1980 series) 

- Myth of density variation 3.0  kg/m3 in Petroleum Industry



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