Flexible pipes, hoses and hose assemblies – which are
flexible hoses with end fittings attached – should be in as short
lengths as practicable, but should not, in general, exceed 1.5 m in
length, and only be used where necessary to accommodate relative
movement between fixed piping and machinery parts. Where a flexible
section of piping is provided, connections should be of a screw type or
equivalent approved type. Flexible pipes and end attachments shall be of
approved fire-resisting materials.