
Trappex
Heating-system protection developed from hands-on gas engineering experience, with practical products designed to protect systems from debris, trapped air and pressure problems.
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LPG / LPG-air worksheet v3.0 — 2 November 2026
No printer? We can print and post your TomKat Edition 4 worksheet for you.
The document is free. We do not charge for the worksheet itself.
This is a printing and postal service for TomKat’s own IGEM/UP/1B Edition 4 worksheet. The charge covers preparing your printed copy, packaging and delivery.
£0.00 for the document. Printing, packaging and UK Second Class postage costs £3.50 for 1–2 sheets or £3.99 for 3–6 sheets, added at checkout. We print one A4 colour copy and send it flat in an envelope.
This listing is for the LPG / LPG-air IGEM volume and pressure-drop worksheet. Natural gas has its own separate sheet. This is not the LPG pipe-sizing practice worksheet.
The sheet brings together installation-volume working, purge-volume working and reference tables, with a QR code for TomKat’s free Edition 4 calculator.
TomKat training aid: this is our worksheet, not a copy of the IGEM standard. Use it alongside the full IGEM/UP/1B Edition 4 standard and the relevant training.
Plain: a standard printed sheet. Laminated (+£1 per sheet): your worksheet sealed in a clear protective pouch. Choose your finish above before adding to your basket.
Printing, packaging and UK Second Class postage costs £3.50 for 1–2 sheets or £3.99 for 3–6 sheets, added at checkout. Maximum six different printed worksheets or reference sheets per order. Choose one copy of each document, plain or laminated, not both. Plain sheets are £0; lamination is £1 extra per sheet. Other products may have separate delivery charges. Postal service only.
Your order covers the worksheet version supplied. If we publish an updated version later, we won’t automatically send another printed or laminated copy. You can download the latest free PDF from our website, or place a new print-and-post order at the charges shown at that time. This does not affect your statutory rights.
Need more than one copy of any worksheet? Get in touch on WhatsApp and we’ll help arrange a larger order for your team, with plain or laminated sheets.
PRACTICAL IDEAS FROM OUR INDUSTRY
We’re proud to support useful innovations created by people who understand the trade. These are products chosen for the genuine problems they solve for engineers and their customers.

Heating-system protection developed from hands-on gas engineering experience, with practical products designed to protect systems from debris, trapped air and pressure problems.
Explore Trappex products →
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Created by Chris Jepp to make topping up sealed heating systems simpler and help prevent over-pressurising and unnecessary water waste.
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