{
  "url": "https://openlegislation.uk/eu-decision-2020-2009/annex/division-2/division-2.6/division-BATn3",
  "json_url": "https://openlegislation.uk/eu-decision-2020-2009/annex/division-2/division-2.6/division-BATn3.json",
  "legislation": "eudn/2020/2009",
  "legislation_title": "Commission Implementing Decision (EU) 2020/2009 of 22 June 2020 establishing the best available techniques (BAT) conclusions, under Directive 2010/75/EU of the European Parliament and of the Council on industrial emissions, for surface treatment using organic solvents including preservation of wood and wood products with chemicals (notified under document C(2020) 4050) (Text with EEA relevance)",
  "legislation_url": "https://openlegislation.uk/eu-decision-2020-2009",
  "path": "annex/division/2/division/2.6/division/BATn3",
  "kind": "division",
  "number": "BAT 38",
  "heading": "In order to prevent or reduce emissions of treatment chemicals from pressure processes (autoclaves), BAT is to use all of the techniques given below.",
  "text": "Technique\nDescription\n(a)\nProcess controls to prevent operation unless the treatment vessel door is locked and sealed\nThe treatment vessel door is locked and sealed once the treatment vessel is loaded and before treatment takes place. Process controls are in place that prevent the operation of the treatment vessel unless the door is locked and sealed.\n(b)\nProcess controls to prevent the treatment vessel from opening while it is pressurised and/or filled with preservative solution\nProcess controls display the pressure and whether liquid is present in the treatment vessel. They prevent the opening of the treatment vessel while it is still pressurised and/or filled.\n(c)\nCatch-lock for the treatment vessel door\nThe door of the treatment vessel is equipped with a catch-lock to prevent the release of liquids in the event that the treatment vessel door needs to be opened in an emergency situation (e.g. door seal is broken). The catch-lock permits the door to be partially opened to release the pressure while retaining liquids.\n(d)\nUse and maintenance of safety relief valves\nTreatment vessels are fitted with safety relief valves to protect the vessels from excessive pressure.\nDischarges from valves are directed to a tank of sufficient capacity.\nSafety relief valves are regularly inspected (e.g. once every 6 months) for signs of corrosion, contamination or incorrect fitting and are cleaned and/or repaired as required.\n(e)\nControl of emissions to air from the vacuum pump exhaust\nAir extracted from pressure treatment vessels (i.e. the vacuum pump outlet) is treated (e.g. in a vapour-liquid separator).\n(f)\nReduction of emissions to air when opening the treatment vessel\nSufficient time for dripping and condensation is allowed between the depressurisation period and the opening of the treatment vessel.\n(g)\nApplication of a final vacuum to remove excess treatment chemicals from the surface of treated wood\nTo avoid dripping, a final vacuum is applied in the treatment vessel before opening it to remove excess treatment chemicals from the surface of treated wood.\nApplication of a final vacuum may not be necessary if the removal of excess treatment chemicals from the surface of treated wood is ensured by the application of an appropriate initial vacuum (e.g. less than 50 mbar).",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eudn/2020/2009/annex/division/2/division/2.6/division/BATn3",
    "retrieved_at": "2026-11-01T15:12:03.527850+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}