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Flare monitoring for projects using methane destruction methods

21 November 2016

 

Flares used to combust methane in Emissions Reduction Fund projects must employ a mechanism that detects whether the flare is (a) operating and (b) combusting the methane completely. Unless otherwise specified in the applicable method, a project may monitor a flare through one or more of the following.

For projects that use a frequent sparking flare:

  1. a flare operation monitor, such as a UV sensor, that operates continuously and indicates when an operational failure occurs and how long it lasts
  2. a device that operates continuously and indicates when an operational failure occurs by detecting the absence of a flame.

For projects that use a temperature control system:

  1. a temperature detection monitor that operates continuously and indicates when the temperature of the flare drops below 500°C and how long these periods last
  2. a temperature detection monitor that operates continuously and indicates when the temperature of the flare drops below the temperature required to achieve the default 98 per cent destruction efficiency (specified by the manufacturer) and how long these periods last
  3. a mechanism, such as a thermocouple or temperature sensor, that operates continuously and indicates when operational failures occur and how long these periods last.

For projects that use neither a frequent sparking flare or a temperature control system:

  1. An equivalent mechanism that operates continuously and indi​cates when an operational failure occurs by detecting the absence of a flame.

For projects that use either a frequent sparking flare or temperature control system:

  1. a flare operation monitor, either manual or automatic, that shuts down gas flow to the flare when operational failures (complete or partial) occur and records how long these periods last.

All Emission Reduction Fund​ projects that use flares for methane combustion must have a system for recording any period of over 20 minutes in which flare operation fails completely or partially. For ease of accounting for periods of flare operation failure, the recording system may be aligned with the data collection system for the flow meter.

For flare operation failure events of over 20 minutes, the destruction efficiency is assumed to be zero for the relevant one-hour period. For flare operation failure events for periods of 20 minutes or less, the average destruction efficiency must be adjusted for the relevant one-hour period.

If gas flow is shut down, the duration of the shutdown must be recorded. If gas flow is not shut down, the corresponding gas flow amount for the same hour cannot be included in calculations of avoided emissions.

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