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IGEM/UP/1B Edition 4 · Free PDF
Natural gas
Installation volume, purge volume and permissible pressure-drop working for natural gas. Includes the resource-use notice on page 2.
Get the natural gas sheetIGEM/UP/1B Edition 4 · Free PDF
LPG / LPG-air
The separate Edition 4 sheet for LPG and LPG-air, with the relevant fuel-specific figures. Includes the resource-use notice on page 2.
Get the LPG / LPG-air sheetVisit preparation · 2-page PDF
Gas inspection preparation
Use the sheet alongside Derek’s video, with practical checklists, tools and references to have ready.
Get the free preparation sheet
Natural gas · copper pipe
Gas pipe sizing
Follow Derek’s lesson with a clear working sheet. Use it with the LCL Domestic manual, tables D1a and D1b. The reference tables are not included.
Get the free pipe-sizing sheetLPG propane · copper pipe
LPG pipe sizing
A printable sheet for 37 mbar propane and copper pipework in permanent-dwelling training examples. Use with LCL LPG Issue 5, tables E1 and E1a. Reference tables are not included.
Get the free LPG sheetHeating controls
Y-plan & S-plan
Two-sided reference sheets: follow the call for heat, understand the wire functions and compare them with the example wiring.
View the free Y-plan & S-plan sheetsUse it online
Calculators & practical tools
Open the tool for the job, and read its scope and instructions before using it.






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Guidance & Derek’s videos
Preparing for a Gas Safe inspection?
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Watch Derek’s videos →TomKat resources are training aids and practical guidance. Always follow the current standards, the actual equipment instructions and safe working practices relevant to the job.
Keep up with TomKat
Keep up with TomKat
Selected gas-industry updates explained in plain English, with links to the original guidance. Free to subscribe.
