Notice

Testing of pressure relief valves (PRVs) fitted to LPG road tankers

Authorisation 948 regarding testing requirements for pressure relief valves fitted to liquefied petroleum gas (LPG) road tankers.

• From: Department for Transport
• Published: 16 April 2020
• Last updated: 2 December 2025
  Show all updates

  1. 2 December 2025

     Notice revised to remove pressure relief valves from Schedule No 1 Rev.5 Motor Vehicles (Tranche 3) and Schedule No 2 Rev.3 Trailers (Tranche 3).

  2. 4 November 2025

     Notice revised to remove Schedule No 1. Rev.3 Motor Vehicles (Tranche 2) and pressure relief valves from Schedule No 1 Rev.1 Motor Vehicles (Tranche 3) and Schedule No 2 Rev.2 Trailers (Tranche 3).

  3. 23 January 2025

     Notice expiry date extended until March 2026 and schedules amended.

  4. 21 June 2023

     This revision removes PRVs in Schedule No.1 Rev.6 Motor Vehicles (Tranche 1), Schedule No.1 Rev.2 Motor Vehicles (Tranche 2), Schedule No.2 Rev.5 Trailers (Tranche 1) and Schedule No.2 Rev.1 Trailers (Tranche 2) and corrects the pressure relief valve serial numbers for line 34 of Schedule No 1 Rev.2 Motor Vehicles (Tranche 3) and line 4 of Schedule No 2 Trailers (Tranche 3).

  5. 25 March 2022

     This revision removes PRVs in Schedule No.1 Rev.5 Motor Vehicles (Tranche 1) and Schedule No.2 Rev.4 Trailers (Tranche 1). It also includes additional PRVs in Schedule No.1 Motor Vehicles (Tranche 3) and Schedule No. 2 Trailers (Tranche 3).

  6. 21 December 2021

     This revision corrects the pressure relief valve serial numbers for Schedule No.1 Rev.1 (Motor Vehicles) Trance 2 entry numbers 67, 72 and 74.

  7. 11 March 2021

     This revision extends the time limit of the authorisation and also includes additional PRVs in Schedule No.1 (Motor Vehicles) Tranche 2 and Schedule No.2 (Trailers) Tranche 2.

  8. 23 October 2020

     This revision corrects the PRV serial numbers for motor vehicle entry numbers 14, 18 and 40 in Schedule No. 1.

  9. 9 July 2020

     This revision corrects the registration number of motor vehicle entry number 25 and the PRV serial number of motor vehicle entry number 30 in Schedule No. 1; adds three new motor vehicle entries (68, 69 and 70) to Schedule No. 1; corrects the identification number of trailer entry number 13 and the PRV serial number of trailer entry number 16 in Schedule No. 2; and removes trailer entry number 15 from Schedule No. 2.

  10. 22 May 2020

      Authorisation 948 revision 1 corrects 2 entries in the schedules and includes a new provision to cover occasions when the scheduled intermediate inspection has been missed. The revision also allows for an inspection body to check the pressure relief valves for satisfactory operation if considered necessary.

  11. 16 April 2020

      First published.

Documents

Testing of pressure relief valves (PRVs) fitted to LPG road tankers

PDF, 168 KB, 5 pages

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Details

This authorisation (948) disapplies the testing requirement in 6.8.2.4.3 for pressure relief valves (PRVs) fitted to the tanks of tank-vehicles set out in the schedules to this authorisation.

This revision also removes Schedule No.1 Rev.6 Motor Vehicles (Tranche 1) and Schedule No.2 Rev.5 Trailers (Tranche 1).

It also removes PRVs in:

• Schedule No.1 Rev.3 Motor Vehicles (Tranche 2)
• Schedule No.2 Rev.2 Trailers (Tranche 2)
• Schedule No 1 Rev.3 Motor Vehicles (Tranche 3)
• Schedule No 2 Rev.2 Trailers (Tranche 3)

This authorisation has immediate effect and will remain in force until 31 March 2026 unless withdrawn or otherwise revoked.