English to Portuguese Tech/Engineering Petroleum Eng/Sci Liquefied Petroleum test

Sampling Small Crude Oil Lease Tanks—Small crude oil lease tanks of less than 159 m3 (1000 barrels) used for custody transfer related to truck or pipeline gathering systems often require an assessment of crude oil quality be made onsite prior to beginning the custody transfer.

clearance sample, n—a spot sample taken with the inlet opening of the sampling device 10 cm (4 in.) (some regulatory agencies require 15 cm (6 in.)) below the bottom of the tank outlet.
This term is normally associated with small (159 m3 (1000 barrels) or less) tanks, commonly referred to as lease tanks.