{
  "url": "https://openlegislation.uk/motor-vehicles-construction-and-use-regulations-northern-ireland-1999/schedule-5/paragraph-1",
  "json_url": "https://openlegislation.uk/motor-vehicles-construction-and-use-regulations-northern-ireland-1999/schedule-5/paragraph-1.json",
  "legislation": "nisr/1999/454",
  "legislation_title": "Motor Vehicles (Construction and Use) Regulations (Northern Ireland) 1999",
  "legislation_url": "https://openlegislation.uk/motor-vehicles-construction-and-use-regulations-northern-ireland-1999",
  "path": "schedule/5/paragraph/1",
  "kind": "paragraph",
  "number": "1",
  "heading": "Definitions",
  "text": "In this Schedule—\n“check valve” means a device which permits the flow of gas in one direction and prevents the flow of gas in the opposite direction;\n“design pressure” means the pressure which a part of a gas system has been designed and constructed safely to withstand;\n“double-check valve” means a device which consists of two check valves in series and which permits the flow of gas in one direction and prevents the flow of gas in the opposite direction;\n“excess flow valve” means a device which automatically and instantaneously reduces to a minimum the flow of gas through the valve when the flow rate exceeds a set value;\n“fixed gas container” means a gas container which is attached to a vehicle permanently and in such a manner that the container can be filled without being moved;\n“gas container” means a container, not being a container for the carriage of gas as goods, which is fitted to or carried on a motor vehicle or trailer and is intended for the storage of gas for either—\n(a) the propulsion of the motor vehicle, or\n(b) the operation of a gas-fired appliance;\n“high pressure” means a pressure exceeding 1.0325 bar absolute;\n“high pressure pipeline” means a pipeline intended to contain gas at high pressure;\n“pipeline” means a pipe or passage connecting any two parts of a gas propulsion system of a vehicle or of a gas-fired appliance supply system on a vehicle or any two points on the same part of that system;\n“portable gas container” means a gas container which may be attached to a vehicle but which can readily be removed;\n“pressure relief valve” means a device which opens automatically when the pressure in the part of the gas system to which it is fitted exceeds a set value, reaches its maximum flow capacity when the set value is exceeded by 10% and closes automatically when the pressure falls below a set value; and\n“reducing valve” means a device which automatically reduces the pressure of the gas passing through it, and includes regulator devices.",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [
    {
      "type": "words inserted",
      "affecting": "nisr/2004/44",
      "affecting_title": "Motor Vehicles (Construction and Use) (Amendment) Regulations (Northern Ireland) 2004"
    },
    {
      "type": "substituted for Sch. 5 para. 4(4)",
      "affecting": "nisr/2004/44",
      "affecting_title": "Motor Vehicles (Construction and Use) (Amendment) Regulations (Northern Ireland) 2004"
    },
    {
      "type": "substituted",
      "affecting": "nisr/2004/44",
      "affecting_title": "Motor Vehicles (Construction and Use) (Amendment) Regulations (Northern Ireland) 2004"
    }
  ],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/nisr/1999/454/schedule/5/paragraph/1",
    "retrieved_at": "2026-10-29T02:17:32.000361+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."
}