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GAS

GB Gas Onsite Guide

2026 Onsite & Fault Finding Guides

Quick-reference domestic gas guidance for engineers and trainees, including the 2026 Onsite Guide and Gas Controls & Combustion Fault Finding Guide.

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GAS

GB Gas Pipe Sizing Calculator

Natural Gas Pipe Sizer

Natural Gas pipe sizing, pressure-loss calculations, installation volume and purge volume.

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GAS

GB GAS L.P.G. PIPE SIZING APP

LPG Pipe Sizing

LPG pipe-sizing calculations for engineers working with propane and butane installations.

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GAS

GB Gas Tightness NG + LPG

Natural Gas & LPG Tightness Testing

Guided tightness testing for Natural Gas and LPG with current test stages and calculations.

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GAS

GB Gas Tightness Testing

IV and Leakage Allowances

Step-by-step Natural Gas tightness testing aimed at engineers, apprentices and training centres.

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GAS

GB Gas Ventilation Calculator

BS 5440 Calculator

Calculate permanent ventilation requirements for gas appliances, rooms and compartments.

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GAS

GB Gas Purging Calculator

IV, PV and Leakage Allowance

Calculate installation volume, purge volume and related domestic gas values.

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GAS

GB Gas Rate Calculator

Gas Rate & Heat Input

Gas-rate and heat-input calculations for metric and imperial gas meters.

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GAS

GB Gas Conversion Calculator

Gas Conversion App

Convert Natural Gas, LPG, measurement, flow, water-volume and electrical values.

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GAS

GB Gas Flue & Spillage Testing

Flue & Spillage Checks

Flue integrity and appliance spillage testing support for gas engineers.