Document ID: chunk:federal_register_of_legislation:F2015L01230:reg:22
Version: federal_register_of_legislation:F2015L01230
Segment Type: reg
Provision Reference: reg 22
Character Range: 27739–29191

22  Sampling uncertainty
 (1) The sampling uncertainty for a flare device during a reporting period is worked out using the formula (equation 9):
where:
SUi means the sampling uncertainty for flare device i during the reporting period.
ti means the Student's 2‑sided t‑value, at the 95% confidence interval, for the number of relevant component gas measurements for flare device i during the reporting period.
RSDi means the relative standard deviation of all relevant component gas measurements for flare device i during the reporting period, worked out in accordance with subsection (2).
ni means the number of relevant component gas measurements for flare device i during the reporting period.
 (2) The relative standard deviation of all relevant component gas measurements for a flare device during a reporting period is worked out:
 (a) by dividing the standard deviation of those measurements by the mean of those measurements; and
 (b) based on the hydrocarbon species with the highest concentration for the flare device.
 (3) In this section:
relevant component gas measurements, for a flare device, means the measurements made to work out the parameters s and molar fraction in relation to the flare device, whether those measurements are:
 (a) historical sampling data for the parameters; or
 (b) made during monitoring of the parameters in accordance with the monitoring requirements.

Division 5—Method for calculating ancillary emissions