Understanding CDM Methodologies - SuSanA
Understanding CDM Methodologies - SuSanA
Understanding CDM Methodologies - SuSanA
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Box 30: Clarifications on landfill gas flow monitoring<br />
Meter<br />
Redundancy<br />
upheld by EB<br />
Gas Flaring<br />
Projects only need<br />
one Meter<br />
Two requests for clarification were submitted questioning the necessity of<br />
installing flow meters at all measurement points throughout the flaring and<br />
energy system as required by ACM0001. Both requests argued that installing<br />
flow meters at each measurement point incurred significant costs for project<br />
developers while it did not necessarily increase the level of precision of<br />
measurements.<br />
The first of these submissions 265 requested clarification on whether projects<br />
that flare landfill gas and generate both electricity and thermal energy could<br />
install only three flow meters (instead of four) and determine the value of the<br />
fourth meter by a simple rule of three. To illustrate this, it proposed to measure<br />
the amount of landfill gas flared by subtracting the values of the two meters<br />
recording the amount of landfill combusted in an electricity generator and the<br />
amount of landfill gas combusted in a boiler, from the value recorded by the<br />
meter measuring the total amount of landfill gas captured. The MP responded<br />
negatively to this request arguing that the measurement redundancy was in line<br />
with the conservativeness of ACM0001. Nonetheless, the MP proposed that a<br />
rule of three could occasionally be used in cases where one of the meters would<br />
fail, and that a definition of “occasionally” would have to be drafted. EB 24<br />
endorsed the MP’s decision on this issue.<br />
In a similar vein, a submission 266 requested clarification from the MP on whether<br />
flow meters had to be installed at each measurement point for project activities<br />
that only flare the landfill gas. In this case, SGS argued that such projects were<br />
required to monitor the “total landfill gas flow” and “the flow to the flare”,<br />
which are essentially the same flow. Because installing two flow meters did not<br />
increase the level of precision of measurements but increased project costs, they<br />
questioned whether the clarification given by the MP on previous clarification also<br />
applied to projects that only flare landfill gas, and in such cases, whether it was<br />
necessary to install two flow meters. The MP acknowledged that the redundancy<br />
in measurements was not necessary for projects that only flare landfill gas. Such<br />
decision was supported by EB25 and led to a revision of ACM0001.<br />
231<br />
See AM_CLA_0020<br />
232<br />
See AM_CLA_0028<br />
90