Location and support of LPG cylinders

D.1 The advice given in paragraph D.2 and Diagram D1 is informative and may be considered for an LPG storage installation that consists of a set of two or more cylinders having a combined capacity greater than 150 litres. D.2 A cylinder should stand upright, be secured by straps or chains against a wall outside the building in a well ventilated position at ground level. It should be readily accessible, reasonably protected from physical damage and located where it does not obstruct exit routes from the building. A firm level base, such as concrete not less than 50 mm thick or paving slabs bedded on mortar should be provided. The cylinder valves should be not less than - (a) 1000 mm horizontally and 300 mm vertically from openings in the building or heat sources such as flue terminals and tumble-dryer vents; and (b) 2000 mm horizontally from drains without traps, unsealed gullies and cellar hatches, unless an intervening wall not less than 250 mm high is provided.