For Steam Generating Vessels like Boilers, Economizers, Super-Heaters, sec. Steam is also used in thermal power plants to drive the turbines. Policy covers boilers, economizers, super heaters, steam pipes, pressure vessels, other vessels under steam gas or air pressure. The perils covered are explosion or collapse, damage to boiler, pressure vessel etc, damage to surrounding property of the insured and liability to third party. Major exclusions are fire policy perils, war and nuclear perils, external explosion.