Liquid Gas UK CoP 22: 2025 – Design, Installation and Testing of LPG Piping Systems
This Industry Standard Update provides an overview of the key areas of change arising from the revision of Liquid Gas UK CoP 22: Design, Installation and Testing of LPG Piping Systems – 2020 amendment 1.
Introduction
During July 2025, an updated Code of Practice: Liquid Gas UK CoP 22: 2025 Design, Installation and Testing of LPG Piping Systems(1) was published. This supersedes the previous version, Liquid Gas UK CoP 22 Design, Installation and Testing of LPG Piping Systems – 2020 amendment 1(2). The revision to this standard comes into effect immediately.
General
A brief summary of the major changes to this document includes the incorporation of pipe sizing, regulators and regulator working pressures from Appendix G from the previous document into Section 4 of the updated standard.
Main parts of the pipework testing (Appendix I) have been combined with Section 7 from the old standard into Section 8 of the new document, with additional references to the methodology used in IGEM/UP/1 Edition 2 Strength testing, tightness testing & direct purging of industrial & commercial gas installations (Reprint with Amendments August 2005)(3).
Maximum permitted leak rate (MPLR) and temperature correction information and calculations have been added to Section 8. Various tables in Appendix H have also been added and amended to reflect these changes.
Appendix E has been updated to include additional definitions and acronyms that are relevant to the new information contained in the Code of Practice.
A new addition to the document is Section 2.4, which details the installation and operation of pump differential bypass valves and their requirement to be fitted with multi-stage and positive displacement pumps. Reference to this is also addressed in the commissioning and records section.
Construction of pipework assemblies (Section 5) now specifies the application of setting sealants for threaded pipework, stating that the sealant must permit disassembly when required.
Appendix K:
The pressure equipment (safety) regulations flowchart has now been included to give guidance on categorising the equipment for its appropriate use.
Liquid Gas UK Cop 22: 2025 is available here.
Bibliography
(1) Liquid Gas UK Code of Practice 22: 2025 Design, Installation and Testing of LPG Piping Systems
(2) Liquid Gas UK CoP 22 2020 amendment 1 – Design, Installation and Testing of LPG Piping Systems
(3) IGEM/UP/1 Edition 2 Strength testing, tightness testing & direct purging of industrial & commercial gas installations (Reprint with Amendments August 2005)