Tanks and Pressure Receptacles

This page was last updated on 20th April 2021

DfT Authorisation 839 – Tanks below ADR minimum thickness

DfT DGD have issued Authorisation 839 to permit the continued operation of tanks with shell thickness below the ADR minimum.

The main text of the authorisation can be found here: https://www.gov.uk/government/publications/tanks-below-the-minimum-thickness

Approved tanks can be identified in the listings in the relevant schedules:

Schedule 1 – L4BN (General Purpose tanks)

Schedule 2 – LGBF (Fuel tankers)

Note: This authorisation is applicable to tanks constructed with reduced shell thickness only – i.e. not for tanks which have had reduction in shell thickness during operation.

To add a tank to one of the schedules, an application must be made to VCA DGO with a supporting safety case indicating that safety is not otherwise compromised, and that all other provisions of the ADR regulations have been met. Applications should include the following information relating to the tank (items in bold are mandatory):

  • Tank serial number, exactly as displayed on the tank plate
  • Date of manufacture
  • ADR tank code
  • Products approved for carriage (as per GN-2020-02 (‘Guidance Note GN2’))
  • Any relevant special ADR provisions (e.g. TAx, TUx, TCx provisions)
  • Length of time the tank has been in service
  • Any relevant additional certifications e.g. IMO tank status
  • A report describing any corrosion or localised thinning of the tank shell, surge plates, baffles etc.
  • Construction code
  • Type approval number
  • Materials of construction

Applications are to be supported by the following documents where relevant (items in bold are mandatory):

  • Safety case, including the following:
    • Declaration by an AIB pursuant to the alternative carriage provisions in the authorisation
    • Calculations showing the tank can withstand appropriate stresses
  • Additional safety measures recommended by the inspector (e.g. removal of products, increased frequency of inspections)
  • Image of tank plate
  • Images of tank shell, baffles, surge plates
  • Thickness measurements
  • Drawings