API MPMS 3.1B* 2nd June 2001 Standard Practice for Level Measurement of Liquid Hydrocarbons in Stationary Tanks by Automatic Tank Gauging.pdf
it was reaffirmed in Aug. 2011
API MPMS 3.1B* 2nd June 2001 Standard Practice for Level Measurement of Liquid Hydrocarbons in Stationary Tanks by Automatic Tank Gauging.pdf
it was reaffirmed in Aug. 2011
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