Section 9(2)(f) in The Merchant Shipping (Crew Accommodation) Rules, 1960
(f)All steam pipes, hot water pipers and calorifiers in or serving the crew accommodation shall be efficiently lagged wherever lagging is necessary for the conservation of heat or the protection of the crew against injury or discomforts. All cold water pipes in the crew accommodation shall be efficiently lagged wherever lagging is necessary for the prevention of condensation.