| http://www.w3.org/ns/prov#value | - Professional Certificate of Competency in the Selection, Commissioning and Maintenance of Shutdown, Blowdown, Severe Service and Choke Valves In order to meet the exacting demands of the oil and gas, mining, manufacturing and downstream processing industries, modern plants are equipped with systems and devices which are needed to measure and regulate variables such as temperature, pressure, flow,
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