# Commission Implementing Decision of 9 October 2014 establishing best available techniques (BAT) conclusions, under Directive 2010/75/EU of the European Parliament and of the Council on industrial emissions, for the refining of mineral oil and gas (notified under document C(2014) 7155) (Text with EEA relevance) (2014/738/EU), Division: DEFINITIONS Extent: E+W+S+N.I. For the purpose of these BAT conclusions, the following definitions apply: Term used Definition Unit A segment/subpart of the installation in which a specific processing operation is conducted New unit A unit first permitted on the site of the installation following the publication of these BAT conclusions or a complete replacement of a unit on the existing foundations of the installation following the publication of these BAT conclusions Existing unit A unit which is not a new unit Process off-gas The collected gas generated by a process which must be treated e.g. in an acid gas removal unit and a sulphur recovery unit (SRU) Flue-gas The exhaust gas exiting a unit after an oxidation step, generally combustion (e.g. regenerator, Claus unit) Tail gas Common name of the exhaust gas from an SRU (generally Claus process) VOC Volatile organic compounds as defined in Article 3(45) of Directive 2010/75/EU NMVOC VOC excluding methane Diffuse VOC emissions Non-channelled VOC emissions that are not released via specific emission points such as stacks. They can result from ‘area’ sources (e.g. tanks) or ‘point’ sources (e.g. pipe flanges) NOX expressed as NO2 The sum of nitrogen oxide (NO) and nitrogen dioxide (NO2) expressed as NO2 SOX expressed as SO2 The sum of sulphur dioxide (SO2) and sulphur trioxide (SO3) expressed as SO2 H2S Hydrogen sulphide. Carbonyl sulphide and mercaptan are not included Hydrogen chloride expressed as HCl All gaseous chlorides expressed as HCl Hydrogen fluoride expressed as HF All gaseous fluorides expressed as HF FCC unit Fluid catalytic cracking: a conversion process for upgrading heavy hydrocarbons, using heat and a catalyst to break larger hydrocarbon molecules into lighter molecules SRU Sulphur recovery unit. See definition in Section 1.20.3 Refinery fuel Solid, liquid or gaseous combustible material from the distillation and conversion steps of the refining of crude oil. Examples are refinery fuel gas (RFG), syngas and refinery oils, pet coke RFG Refinery fuel gas: off-gases from distillation or conversion units used as a fuel Combustion unit Unit burning refinery fuels alone or with other fuels for the production of energy at the refinery site, such as boilers (except CO boilers), furnaces, and gas turbines. Continuous measurement Measurement using an ‘automated measuring system’ (AMS) or a ‘continuous emission monitoring system’ (CEMS) permanently installed on site Periodic measurement Determination of a measurand at specified time intervals using manual or automated reference methods Indirect monitoring of emissions to air Estimation of the emissions concentration in the flue-gas of a pollutant obtained through an appropriate combination of measurements of surrogate parameters (such as O2 content, sulphur or nitrogen content in the feed/fuel), calculations and periodic stack measurements. The use of emission ratios based on S content in the fuel is one example of indirect monitoring. Another example of indirect monitoring is the use of PEMS Predictive Emissions monitoring system (PEMS) System to determine the emissions concentration of a pollutant based on its relationship with a number of characteristic continuously monitored process parameters (e.g. fuel-gas consumption, air/fuel ratio) and fuel or feed quality data (e.g. the sulphur content) of an emission source Volatile liquid hydrocarbon compounds Petroleum derivatives with a Reid vapour pressure (RVP) of more than 4 kPa, such as naphtha and aromatics Recovery rate Percentage of NMVOC recovered from the streams conveyed into a vapour recovery unit (VRU) --- Source: https://www.legislation.gov.uk/eudn/2014/738/annex/division/3 (the official version) Page: https://openlegislation.uk/eu-decision-2014-738/annex/division-3 Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.