Exploitable results 600 mm orifice plate project: Parts I to XIII The discharge coefficients of a 600 mm diameter orifice plate meter have been determined in natural gas under ideal conditions using orifice plate beta ratios of 0.2, 0.37, 0.5, 0.57, 0.66 and 0.75. These measurements form a part of a larger series conducted in one other natural gas facility and 2 water facilities. Searching for OpenAIRE data... There was an error trying to search data from OpenAIRE No results available