API MPMS 3.2 1st Edition, August 1, 1995
Manual of Petroleum Measurement Standards Chapter 3-Tank Gauging Section 2-Standard Practice for Gauging Petroleum and Petroleum Products in Tank Cars
Includes all amendments and changes through Reaffirmation Notice , May 2013
Additional Comments: H03021
Published By:American Petroleum Institute (API)
Tank car contents may be measured by three methods: railroad scale weighing, metering, and liquid level measurement. This standard describes only the equipment for and the procedures of the liquid level method of measurement.
When tank cars can be opened for manual measurements, gauge tapes and bobs may be used to measure the level of liquid contents. When tank cars cannot be opened for gauging contents, closed-system measurement equipment must be used for gauging. This standard describes gauging and temperature measurement equipment used in both open and closed measurement systems.