portuguese national inventory report on greenhouse gases, 1990

Industrial ProcessesEmi SF6 (t) = Stock SF6 (t) * (EF/100)where:Emi SF6 (t) - Equipment use emissions, including leakage emissions, servicing andmaintenance;Stock SF6 (t) - total SF 6 gas in existence at year t in all electrical equipments;EF – Emission Factor, corresponding to the percentage of SF 6 in stock at year t that isemitted to atmosphere.4.3.5.16.2.3 EDP Produção, Tejoenergia and TurbogásThe used methodology was identical to the one described in “EDP Distribuição”.Disposal or retiring units were not included in the <strong>inventory</strong> as emission sources because,according to industry experts, the collection of gas at end of lifetime is done in a systematic andefficient way. Manufacturing and installation emissions were assumed to be included inemissions from equipment usage.4.3.5.16.3 Emission FactorsThere are different emission factors for:- REN;4.3.5.16.3.1 REN- EDP Distribuição;- EDP Produção;- Tejoenergia;- Turbogás.The database on SF 6 repositions by equipment was available for the period 2003-2010. For theperiod 1995-2002, an average of the estimated loss (0.38 percent) for the period 2003-2010was considered.4.3.5.16.3.2 EDP DistribuiçãoIn EDP Distribuição different emission factors were considered for:- Gas Circuit Breakers:all circuit breakers are “Closed Pressure” equipments and the emission factor is 2.6percent/year as proposed on table 8.3 of “2006 IPCC Guidelines for NationalGreenhouse Gas Inventories” for “Closed Pressure Electrical Equipment”;- Outdoor Gas Insulated Switchgears;all outdoor gas insulated switchgears are “Sealed Pressure” equipments and theemission factor is 0.2 percent/year as proposed on table 8.2 of “2006 IPCC Guidelinesfor National Greenhouse Gas Inventories” for “Sealed Pressure Electrical Equipment”;Portuguese National Inventory Report 2013MAMAOT4-73