- Temperature around 3 deg C, - Density Conversion for Petroleum Products from observed temperature to 15 C without use of ASTM Table (1980 series)
One follower from Alaska, US has requested the formula for the subject conversion.
The post gives a simple way to convert Density of petroleum products from ambient temperature ( around 3 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 very low, this method is useful.
A) Simplified Formula
Where C and T are :
The above is for ASTM Density Conversion tables of 1980 series. Some industry still use old series 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.
rjpatelioc2014@gmail.com
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List of all blog articles on Petroleum QC by RJ Patel.
Follow me on twitter @RJPatel13 to get notification when my new post is available in my blog.
The post gives a simple way to convert Density of petroleum products from ambient temperature ( around 3 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 very low, this method is useful.
A) Simplified Formula
D15 = do - 10 + C x ( to – T)
Density at 15 deg c = Density observed - 10 + Constant x ( temp observed – T )
Temperature unit is C and Density unit is kg/m3
Temperature unit is C and Density unit is kg/m3
Where C and T are :
Product
|
C = Constant
|
T
|
Gasoline / Naphtha
|
0.9
|
4
|
Kerosine / Jet A-1
|
0.7
|
1.5
|
Gasoil Diesel Fuel
|
07
|
0.5
|
B) How to use formula manually without calculator
Example : 1 Gasoline
Density observed = 750.0 kg/m3
Temp. observed = 6 deg c
ASTM table 53 B = 742.0
Steps : 1) minus 10 to observed density ie. 740.0
2) find difference ( to – T) manually ie. 2
3) multiply difference and constant ie. 2 x 0.9 = 1.8
4) Add this product to step 1 ie. 740.0 + 1.8 = 741.8
Gasoline more examples :
Observed Density 760 at 2 deg C, Density 15 C =748.6, ASTM table =748.6 kg/m3
Observed Density 747 at 4 deg C, Density 15 C =737.0, ASTM table =737.2 kg/m3
Example : 2. Jet A-1 / Kerosene
Observed Density 760 at 2 deg C, Density 15 C =748.6, ASTM table =748.6 kg/m3
Observed Density 747 at 4 deg C, Density 15 C =737.0, ASTM table =737.2 kg/m3
Example : 2. Jet A-1 / Kerosene
Density observed = 796.0
Temp. observed = 5.5 deg c
ASTM table 53 B = 789.0
Steps : 1) minus 10 to observed density ie. 786.0
2) find difference ( to – T) manually ie. 4
3) multiply difference and constant ie. 4 x 0.7 = 2.8
4) Add this product to step 1 ie. 786.0 + 2.8 = 788.8
Jet A-1 / Kerosene more examples :
Observed Density 803 at 7.5 deg C, Density 15 C =797.2, ASTM table =797.6 kg/m3
Observed Density 797 at 1 deg C, Density 15 C =786.7, ASTM table =786.6 kg/m3
Example : 3, Gasoil
Observed Density 803 at 7.5 deg C, Density 15 C =797.2, ASTM table =797.6 kg/m3
Observed Density 797 at 1 deg C, Density 15 C =786.7, ASTM table =786.6 kg/m3
Example : 3, Gasoil
Density observed = 838.0
Temp. observed = 6.5 deg c
ASTM table 53 B = 832.1
Steps : 1) minus 10 to observed density ie. 828.0
2) find difference ( to – T) manually ie. (6)
3) multiply difference and constant ie. 6 x 0.7 = 4.2
4) Add this product to step 1 ie. 828.0+4.2 = 832.2
Gasoil more examples :
Observed Density 846 at 2.5 deg C, Density 15 C =837.4, ASTM table =837.4 kg/m3
Observed Density 835 at (-)1 deg C, Density 15 C =824.0, ASTM table =823.8 kg/m3
Gasoil more examples :
Observed Density 846 at 2.5 deg C, Density 15 C =837.4, ASTM table =837.4 kg/m3
Observed Density 835 at (-)1 deg C, Density 15 C =824.0, ASTM table =823.8 kg/m3
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.
rjpatelioc2014@gmail.com
Author's Profile
List of all blog articles on Petroleum QC by RJ Patel.
Follow me on twitter @RJPatel13 to get notification when my new post is available in my blog.
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