Petroleum Products QC

- Excel Formula-Density Conversion to 15 deg C,  table ASTM 53 B - 1980,    Excel sheet giving the Density 15 deg C figures from given observed Density and observed temperature for petroleum product as derived from ASTM tables 53 B. Density conversion to 15 deg C matches exactly with the ASTM conversion tables 1980. Lists of Android/iOs Apps developed on Petroleum Calculation - see here.      (These apps convert Density/API gravity 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.)   Example:  Observed density is 792 kg/Cu. M and observed temperature is 29 deg C. Corresponding 15 deg C for this set of data comes 802.2  kg/Cu. M Excel Worksheet - green color cells  observed density and observed sample temperature are variables and Red color digits are the answer - density at 15 deg C.  Apps developed on Petroleum Calculations - see here. Density Conversion from observed temperature to 15 deg C us

- Patel's Density Conversion for Petroleum Products from observed temperature to 15 C without use of  ASTM Table Following simple method help in easily converting petroleum products density to 15 deg C, without using ASTM Tables, and without help of calculators. It is very handy for field persons who are taking density for comparing parent density for Quality Control purpose.  This method is developed for temperate area  where ambient/sample temperature is normally 27 +/- 5  deg C.    For colder area,  see formula in a different post in this blog.  Difference from this method comparing to actual ASTM table is usually after decimal point that also less than 0.4  kg/m 3  one need to remember that usually persons read hydrometers and thermometers without considering the eye approximation between digits, which any way cause error of more than 0.4  kg/m 3  .  A)    Simplified   Formula                           D 15  = d o   + 10 +  C  x (   t o  – T)    Density at

- Patel’s laws of Gasoline 15c Density increasing Revised 19th Mar, 2018 1.      Patel’s First law of Gasoline 15c Density increasing. Gasoline Density is lowest at the time of its birth ie. first batch certification at manufacturing stage . 2.      Patel’s Second law of Gasoline 15c Density increasing. Gasoline 15c Density increases with time, if not stored in airtight containers . Explanation:  Gasoline evaporates at ambient temperature, losing lighter hydrocarbons like propane (-42C), propene (-47C), butane (-0.5C), butene (-6.1C), iso-pentane (27C), pentane (+36C).  These lighter hydrocarbons have 15c density below 600 kg/m 3 .   Figures in brackets are boiling points.  In any gasoline sample, percentage of such volatile lighter hydrocarbons present equal to its reid vapour pressure in psia units.  Container means here storage tanks, transport vehicle tanks and sample containers. 3.      Patel’s Third law of Gasoline 15c Density increasing. Gasoline 1