Should I avoid leaving tap water inside aluminum cylinders made from alloy 6061?
Yes. Do not leave tap water or any other kind of water inside any aluminum or aluminum-lined cylinder—or any steel cylinder, for that matter. Water remaining inside a cylinder is considered a “contaminant.” Luxfer, as well as regulatory authorities around the world, have required for years that cylinders be kept free of contaminants. If a cylinder becomes contaminated with tap water, pure water, sea water, oil, grease or other contaminating substances, the cylinder should be removed from service, properly cleaned, thoroughly dried and diligently inspected before further use. However, in some countries, regulations or standards require that cylinders containing water be condemned and rendered unserviceable (for example, see ISO 10461, Section 14.2). In short, if you find water or other contaminants inside your cylinder, take it out of service and comply with all applicable regulations.
