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

Obtain samples from tanks, tank cars, and tank trucks by either the core thief or bottle sampling procedure using a bottle that has a 4-cm (1.5-in.) diameter or larger mouth.

tube sample (thief sample), n—a sample obtained with a sampling tube or special thief, either as a core sample or spot sample, from a specific point in the tank or container.

Zone Sampler (Core Sampler):
7.10.1  A zone sampler, also known as a core sampler or a core–type sampling thief, shall be designed and constructed such that, when lowered slowly, it is capable of trapping a vertical column of liquid at any selected level below the surface to within 2.0 cm to 2.5 cm (3/4  in. to 1 in.) of the bottom of the tank.
(core–type sampling thief)

No dic. de petróleo (Eloi Fernandez) - "core" é "testemunho" - zone sampler