Abstract: An ambient ozone control system for generating a desired ozone concentration within a substantially enclosed single-room structure. The system is provided for estimating the volume of the structure in which it is being utilized, and for generating a desired output level of ozone based upon the calculated structure volume. The system includes a user interface, which includes an ozone concentration control for adjusting the desired ozone concentration, a fan control for adjusting the intensity of a fan, and a display. A structure measuring device acquires at least one interior dimension of the structure by measuring the distance from the structure measuring device to at least one of the boundaries of the structure. The processing device calculates the amount of ozone required to achieve the desired ozone concentration within the structure and causes the ozone generating device to generate that amount of ozone.

Abstract: An underwater chain stopper and fairlead apparatus for offshore structures, drilling platforms, ships or other vessels. The apparatus comprises a mounting member, a fairlead member and a chain stopper member. The mounting member is attached to an underwater surface of the offshore structure or vessel and includes a bracket for coupling the fairlead member. The bracket may comprise a hinge allowing the fairlead member to pivot in an approximately horizontal plane. The chain stopper member is coupled to the fairlead member through a hinge which allows the chain stopper member to pivot with respect to the fairlead member in an approximately vertical plane. The chain stopper member includes a chain stopper flapper having a horseshoe shaped opening at one end. The other end of the flapper is connected to the chain stopper member through a hinge which allows the flapper to swing between an open position and a closed position.