To minimise the risk of a fuel leak being ignited by a hot surface and starting a fire, fixed fuel pipes must be positioned well away from any potential source of heat, such as exhaust systems and heating appliances. All fixed fuel feeds and pipes permanently charged with fuel, including balance pipes, must be made of fire resistant and impact resistant material: softened copper, stainless steel, aluminium alloy or (for diesel installations only) mild steel of suitable size.
Fixed pipes can become damaged and release fuel over time because of the effects of vibration and strain, and so must be firmly supported, at approximately 500mm (20ins) intervals. [2.13]