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Specification DOT-4L(HSE) Welded Insulated Cylinders
www.hse.gov.uk1.0 Type, size, service pressure and design service temperature. 1.1 A DOT 4L(HSE) cylinder is a fusion welded insulated cylinder with a water capacity (nominal) not over 454 kg (1000 pounds) and a service pressure of at least 2.76 bar