A professional who inspects crude and refined petroleum before and after transfer from terminal tanks to ship tanks, to determine if it meets prescribed standards. Respnsibilities include:

• Lowers sample container into ship tanks to obtain sample of oil residue and into terminal tanks to sample oil, or opens bleeder valves on pipelines to obtain sample.
• Determines amount and type of bottom sediment, water, and foreign substance present in oil sample, using centrifugal tester and following standard formulas.
• Lowers thermometer into tanks to obtain temperature reading, and determines quantity of oil in ship tanks, using calibrated tape and conversion tables.
• Records test results.
• Turns valves to close tanks, inspects valves for leaks, and clamps seal around valves to secure tank contents.
• Prepares, verifies, and examines cargo ladings, oil transportation records, and export records.
• May direct boat loader i in taking samples and assist in loading and unloading oil.
• May lubricate and adjust valves, using grease gun, oilcan, and handtools.