Volume to Mass Conversion.

In October of 2013, I had written a letter to PHMSA (DOT) requesting an interpretation on how to convert liquid volume to KG Gross.  The Background on why; The FAA had advised me that it is required to use the specific gravity of the liquid to make the conversion of volume to mass for liquids.  UN3082 was one of the UN Numbers which was of concern to me.  Their advice was difficult to comply with, mainly because the specific gravity is not required information on the Shipper's Declaration.

After making a convincing argument and six months of follow up, the DOT/PHMSA issued REF. No.:  13-0203 / 01 May 2014 (Letter of Interpretation) advising that "as an alternative to the use of specific gravity data, a 1:1 conversion ratio where 1 liter is equal to 1 kilogram may be used for the purposes of interpreting the HMR cargo quantity limitations (49 CFR 175.75) expressed in Kilograms."

Great news and a big step forward.  It hasn't been uploaded to the PHMSA Interpretation page yet, but when it is, you will find it here:

http://www.phmsa.dot.gov/hazmat/regs/interps/date

http://www.phmsa.dot.gov/portal/site/PHMSA/menuitem.6f23687cf7b00b0f22e4c6962d9c8789/?vgnextoid=5c14295bba776410VgnVCM100000d2c97898RCRD&vgnextchannel=aa8cd3c1af814110VgnVCM1000009ed07898RCRD&vgnextfmt=print