Gas pipe sizing - how do we work it out? Follow Derek's practical method, from appliance heat input and gas flow to checking the complete route from the meter to each appliance.
£4.99 digital PDF download. No printed booklet is supplied and there is no postage charge.
See it, work through it, have a go
- 20 A4 pages of illustrated teaching, practice exercises and worked answers.
- Step-by-step D1a chart lookups and D1b fitting allowances for natural gas and copper pipe.
- Clear explanations of bends, elbows and reducing tees, including the largest connection size and branch-flow direction.
- Derek's whiteboard example, full workings and a completed pipe-sizing worksheet.
- A blank worksheet and space for your own practice.
- 129 fillable text boxes. Use a PDF reader that supports forms and save your own copy, or print and write by hand. The boxes do not calculate or check answers.
What you need
The selected chart values needed for the included exercises are provided. For your own scenarios, use the full LCL Domestic Gas Safety Training Manual, Issue 6.0, tables D1a and D1b. The manual is sold separately and is not included with this download.
Download and use
Your download link is provided after payment.
Editions and updates
Your purchase covers the edition supplied at the time of purchase. It is a one-off purchase, not a subscription, and does not include future revised or expanded editions. If you would like a later edition, you will need to purchase it separately at the price shown at that time. This does not affect your statutory rights, including where the content originally supplied is faulty or not as described.
Individual licence
This purchase is for one person, for their own learning and reference. You may save the PDF on your own devices and print copies for your own use. Except where permitted by law, sharing with learners, uploading to a training platform, or displaying or reproducing this workbook for classroom teaching requires a separate TomKat licence. No resale or redistribution.
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Independent TomKat teaching aid: use alongside appropriate training, applicable standards and manufacturer instructions. This is not an LCL or BSI publication or a complete installation or commissioning procedure.
Edition 1, October 2026. Original TomKat teaching text and design © 2026 TomKat Gas Training Ltd. Third-party rights remain with their owners.
