I-DEV0449: Application of calibration results to currect for lower accuracy readings from certain continuous flow meters.

Description of non-compliance with monitoring plan during the monitoring period:
In accordance with the monitoring plan contained in the registered PDD, continuous V-cone flow meters were installed to measure the Amount of landfill gas flared i.e LFGflare,y and the Amount of landfill gas combusted in power plant i.e LFGelectricity,y . The instruments were provided by the manufacturer/supplier (Kingsway and KVS Lamways, Shanghai) having accuracy level of ±0.5%. These instruments were calibrated in accordance with manufacturer specification by Kingways controls (2006-1) and KVS Lamways, Shanghai before installations. As result of the calibration, certain instruments were shown to have a lower level of accuracy than indicated in the registered PDD. The difference between accuracy following calibration and the manufacturer’s specifications are shown below for the respective flow meters.

V-cone serial number Installation date
(still in place at the end of monitoring period) Achieved accuracy as per calibration report Accuracy level in registered PDD and manufacturer’s specifications
10071509 (Flare 1 flow meter) 13/03/11 ±0.81%
(Validity of calibration till 23/08/2012) ±0.5%
10071502 (Engine#1 flow meter) 13/03/11 ±0.95%
(Validity of calibration till 19/08/2012) ±0.5%
10071504
(Engine#2 flow meter) 13/03/11 ±0.81%
(Validity of calibration till 19/08/2012) ±0.5%
10071505
(Engine#4 flow meter) 13/03/11 ±0.55%
(Validity of calibration till 22/08/2012) ±0.5%
10071506
(Engine#5 flow meter) 13/03/11 ±0.72%
(Validity of calibration till 22/08/2012) ±0.5%

The above tables format has been changed and can also be viewed in one of the annexs

All other V-Cones used for the monitoring of LFGflare,y and LFGelectricity,y during this monitoring period had a calibration report confirming an accuracy within the ±0.5% range as per the registered PDD.
Proposed deviation:
In order to account for the lower accuracy identified for these instruments , the project participants propose to adjust the monitored flow data from the respective V-cones (indicated above) during their operation period by applying the maximum (lower) accuracy (1%) of the instrument to the measured values by all the above flow meterwhich will result in a conservative emission reductions. Furthermore, the PP has already purchased spare V-cone flow meters which would be initially calibrated before installation and would replace the existing meters when a suitable occasion arises in the operation of the power plant and flares, for example during plant shutdown or engine/flare overhaul.

The deviation request applies only for some of the V-cones that were implemented from 13/03/11 and will be replaced once a full set of spares have been purchased, calibrated and replaced. Therefore, the lower accuracy flow meters will only be used temporarily, and once they have been replaced they will be in compliance with the manufacturer’s specifications and the registered PDD, and hence there will be no need for a revision of the monitoring plan.

The calculation of the emission reductions using the full uncorrected flow monitoring data from the forementioned V-cones resulted in 85,419 tCO2e emission reductions during the current monitoring period.
By applying a 1% reduction in monitored flow data from the aforementioned V-cones, the emission reductions are calculated as 85,138 tCO emission reductions during the current monitoring period.
Therefore, the above adjustment results in a conservative calculation of emission reductions of used of 85,138 which is a reduction of 281 tCO2e compared to the actual monitored data.